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Research highlights

XATOM: all about x-ray atomic physics

XMOLECULE: molecular black hole

XFEL gets MAD

IPD in dense plasmas

Breakdown of frustrated absorption

Tags [Statistics]

Al, alignment, APS, Ar, Argonne, ATAS, attosecond, Auger, average-atom, band structure, C, C60, calibration, cancer therapy, CEI, CFEL, CH3I, charge rearrangement, charge transfer, charge-state, cluster, CO, Co, coincidence, Compton, core-hole states, Coulomb explosion, coulomb explosion, CREXIM, cross section, damage, DCH, decay cascade, DESY, dispersion, DPG, ESCA, European XFEL, excitation, experiment, Fe, FEL, femtosecond x-ray crystallography, FLASH, fluorescence, fragmentation, frustrated absorption, Ge, H2O, heavy atom, HFS, HHG, HI-MAD, HI-RIP, high-intensity phasing, HIP, hollow-atom, ICD, impact ionization, incoherent scattering, inelastic scattering, inner-shell, iodobenzene, iodopyridine, ionization, ionization dynamics, ionization potential depression, IPD, Kr, LCLS, LIED, LTE, machine learning, MAD, magnetic scattering, MD, MMID, molecular dynamic, molecular dynamics, molecular imaging, Monte-Carlo, multiphoton, multiple ionization, nanocrystal, nanoplasma, Ne, NLTE, non-adiabatic, nonequilibrium, nonlinear, nonthermal, OCS, orbital alignment, PAD, PEPIPICO, phase problem, photoabsorption, photofragmentation, photoionization, plasma, Pt, pump-probe, radiation damage, relativity, REMPI, resonance, REXMI, RIP, SACLA, SCH, screening, serial femtosecond crystallography, SFI, SFX, SH, single particle imaging, site-specificity, soft x-ray, spectroscopy, SQS, state-resolved, surface hopping, TDCIS, TDDFT, thermalization, transient absorption, two-photon, two-step, ultrafast, ultrafast dynamics, water, WDM, x-ray, x-ray crystallography, x-ray diffraction, x-ray explosion dynamics, x-ray multiphoton ionization, x-ray scattering, XATOM, XCALIB, XCID, XCRYSTAL, Xe, XeF2, XFEL, XMDYN, XMOLECULE, XPOT, XREMPI, XSINC, XUV

Phys. Rev. Lett. 107, 218102 (2011)

Phys. Rev. X 4, 031004 (2014)

J. Appl. Cryst. 49, 1048 (2016)

Nature 546, 129 (2017)

Nat. Commun. 9, 4200 (2018)

2023–2024

62. L. Budewig, S.-K. Son, Z. Jurek, M. M. Abdullah, M. Tropmann-Frick, et al., X-ray-induced atomic transitions via machine learning: A computational investigation, Phys. Rev. Res. 6, 013265 (2024)
61. L. Budewig, S.-K. Son, and R. Santra, Electron-cloud alignment dynamics induced by an intense X-ray free-electron laser pulse: a case study on atomic argon, Commun. Phys. 7, 363 (2024) [special issue: Ultrafast X-ray Spectroscopy]
60. T. Mazza, T. M. Baumann, R. Boll, A. . Fanis, P. Grychtol, et al., The beam transport system for the Small Quantum Systems instrument at the European XFEL: optical layout and first commissioning results, J. Synchrotron Radiat. 30, 457–467 (2023)
59. A. Rörig, S.-K. Son, T. Mazza, P. Schmidt, T. M. Baumann, et al., Multiple-core-hole resonance spectroscopy with ultraintense X-ray pulses, Nat. Commun. 14, 5738 (2023)
58. L. Budewig, S.-K. Son, and R. Santra, State-resolved ionization dynamics of neon atom induced by x-ray free-electron-laser pulses, Phys. Rev. A 107, 013102 (2023)
57. N. Breckwoldt, S.-K. Son, T. Mazza, A. R"orig, R. Boll, et al., Machine-learning calibration of intense x-ray free-electron-laser pulses using Bayesian optimization, Phys. Rev. Res. 5, 023114 (2023)

2022

56. R. Boll, J. M. Schäfer, B. Richard, K. Fehre, G. Kastirke, et al., X-ray multiphoton-induced Coulomb explosion images complex single molecules, Nat. Phys. 18, 423–428 (2022)
55. L. Budewig, S.-K. Son, and R. Santra, Theoretical investigation of orbital alignment of x-ray-ionized atoms in exotic electronic configurations, Phys. Rev. A 105, 033111 (2022)
54. R. Jin, Z. Jurek, R. Santra, and S.-K. Son, Plasma environmental effects in the atomic structure for simulating x-ray free-electron-laser-heated solid-density matter, Phys. Rev. E 106, 015206 (2022)
53. S. Wirok-Stoletow, R. Jin, D. Kolbasova, S.-K. Son, A. Aquila, et al., Nonsequential two-photon absorption in solid Ge irradiated by an intense x-ray free-electron-laser pulse, Phys. Rev. A 106, 023118 (2022)

2021

52. X. Li, L. Inhester, S. J. Robatjazi, B. Erk, R. Boll, et al., Pulse energy and pulse duration effects in the ionization and fragmentation of iodomethane by ultraintense hard x rays, Phys. Rev. Lett. 127, 093202 (2021)
51. X. Li, L. Inhester, T. Osipov, R. Boll, R. Coffee, et al., Electron-ion coincidence measurements of molecular dynamics with intense x-ray pulses, Sci. Rep. 11, 505 (2021)
50. R. Jin, M. M. Abdullah, Z. Jurek, R. Santra, and S.-K. Son, Transient ionization potential depression in nonthermal dense plasmas at high x-ray intensity, Phys. Rev. E 103, 023203 (2021)
49. Y. Kumagai, Z. Jurek, W. Xu, V. Saxena, H. Fukuzawa, et al., Suppression of thermal nanoplasma emission in clusters strongly ionized by hard x-rays, J. Phys. B: At. Mol. Opt. Phys. 54, 044001 (2021) [Special issue on Frontiers of AMO Science with FELs and Synchrotron Radiation]
48. D. Kolbasova, M. Hartmann, R. Jin, A. Blättermann, C. Ott, et al., Probing ultrafast coherent dynamics in core-excited xenon by using attosecond XUV-NIR transient absorption spectroscopy, Phys. Rev. A 103, 043102 (2021)
47. A. C. LaForge, S.-K. Son, D. Mishra, M. Ilchen, S. Duncanson, et al., Resonance-enhanced multiphoton ionization in the x-ray regime, Phys. Rev. Lett. 127, 213202 (2021)
46. T. Jahnke, R. Guillemin, L. Inhester, S.-K. Son, G. Kastirke, et al., Inner-shell-ionization-induced femtosecond structural dynamics of water molecules imaged at an x-ray free-electron laser, Phys. Rev. X 11, 041044 (2021)

2020

45. A. Trabattoni, J. Wiese, U. De Giovannini, J.-F. Olivieri, T. Mullins, et al., Setting the photoelectron clock through molecular alignment, Nat. Commun. 11, 2546 (2020)
44. Y. Kumagai, Z. Jurek, W. Xu, H. Fukuzawa, K. Motomura, et al., Real-time observation of disintegration processes within argon clusters ionized by a hard-x-ray pulse of moderate fluence, Phys. Rev. A 101, 023412 (2020)
43. S.-K. Son, R. Boll, and R. Santra, Breakdown of frustrated absorption in x-ray sequential multiphoton ionization, Phys. Rev. Res. 2, 023053 (2020)
42. J. J. Bekx, S.-K. Son, B. Ziaja, and R. Santra, Electronic-structure calculations for nonisothermal warm dense matter, Phys. Rev. Res. 2, 033061 (2020)

2019

41. K. Toyota, Z. Jurek, S.-K. Son, H. Fukuzawa, K. Ueda, et al., xcalib: a focal spot calibrator for intense X-ray free-electron laser pulses based on the charge state distributions of light atoms, J. Synchrotron Radiat. 26, 1017–1030 (2019)
40. Y. Hao, L. Inhester, S.-K. Son, and R. Santra, Theoretical evidence for the sensitivity to molecular size of charge-rearrangement-enhanced x-ray ionization, Phys. Rev. A 100, 013402 (2019)
39. N. Berrah, A. Sanchez-Gonzalez, Z. Jurek, R. Obaid, H. Xiong, et al., Femtosecond-resolved observation of the fragmentation of buckminsterfullerene following X-ray multiphoton ionization, Nat. Phys. 15, 1279–1283 (2019)

2018

38. Y. Kumagai, Z. Jurek, W. Xu, H. Fukuzawa, K. Motomura, et al., Radiation-induced chemical dynamics in Ar clusters exposed to strong x-ray pulses, Phys. Rev. Lett. 120, 223201 (2018)
37. L. Inhester, B. Oostenrijk, M. Patanen, E. Kokkonen, S. H. Southworth, et al., Chemical understanding of the limited site-specificity in molecular inner-shell photofragmentation, J. Phys. Chem. Lett. 9, 1156–1163 (2018)
36. J. M. Schäfer, L. Inhester, S.-K. Son, R. F. Fink, and R. Santra, Electron and fluorescence spectra of a water molecule irradiated by an x-ray free-electron laser pulse, Phys. Rev. A 97, 053415 (2018)
35. B. Rudek, K. Toyota, L. Foucar, B. Erk, R. Boll, et al., Relativistic and resonant effects in the ionization of heavy atoms by ultra-intense hard X-rays, Nat. Commun. 9, 4200 (2018)
34. J. J. Bekx, S.-K. Son, R. Santra, and B. Ziaja, Ab initio calculation of electron-impact-ionization cross sections for ions in exotic electron configurations, Phys. Rev. A 98, 022701 (2018)
33. M. M. Abdullah, S.-K. Son, Z. Jurek, and R. Santra, Towards the theoretical limitations of x-ray nanocrystallography at high intensity: the validity of the effective-form-factor description, IUCrJ 5, 699–705 (2018)

2017

32. S.-K. Son, O. Geffert, and R. Santra, Compton spectra of atoms at high x-ray intensity, J. Phys. B: At. Mol. Opt. Phys. 50, 064003 (2017) [special issue: emerging leaders]
31. A. Rudenko, L. Inhester, K. Hanasaki, X. Li, S. J. Robatjazi, et al., Femtosecond response of polyatomic molecules to ultra-intense hard X-rays, Nature 546, 129–132 (2017)
30. K. Toyota, S.-K. Son, and R. Santra, Interplay between relativistic energy corrections and resonant excitations in x-ray multiphoton ionization dynamics of Xe atoms, Phys. Rev. A 95, 043412 (2017)
29. M. M. Abdullah, Anurag, Z. Jurek, S.-K. Son, and R. Santra, Molecular-dynamics approach for studying the nonequilibrium behavior of x-ray-heated solid-density matter, Phys. Rev. E 96, 023205 (2017)

2016

28. Z. Jurek, S.-K. Son, B. Ziaja, and R. Santra, XMDYN and XATOM: versatile simulation tools for quantitative modeling of X-ray free-electron laser induced dynamics of matter, J. Appl. Cryst. 49, 1048–1056 (2016) [special issue on free-electron laser software]
27. B. Ziaja, V. Saxena, S.-K. Son, N. Medvedev, B. Barbrel, et al., Kinetic Boltzmann approach adapted for modeling highly ionized matter created by x-ray irradiation of a solid, Phys. Rev. E 93, 053210 (2016)
26. M. M. Abdullah, Z. Jurek, S.-K. Son, and R. Santra, Calculation of x-ray scattering patterns from nanocrystals at high x-ray intensity, Struct. Dyn. 3, 054101 (2016)
25. L. Inhester, K. Hanasaki, Y. Hao, S.-K. Son, and R. Santra, X-ray multiphoton ionization dynamics of a water molecule irradiated by an x-ray free-electron laser pulse, Phys. Rev. A 94, 023422 (2016)

2015

24. Y. Hao, L. Inhester, K. Hanasaki, S.-K. Son, and R. Santra, Efficient electronic structure calculation for molecular ionization dynamics at high x-ray intensity, Struct. Dyn. 2, 041707 (2015) [special issue on biology with x-ray lasers 2]
23. T. Tachibana, Z. Jurek, H. Fukuzawa, K. Motomura, K. Nagaya, et al., Nanoplasma formation by high intensity hard x-rays, Sci. Rep. 5, 10977 (2015)
22. L. Galli, S.-K. Son, T. A. White, R. Santra, H. N. Chapman, et al., Towards RIP using free electron laser SFX data, J. Synchrotron Radiat. 22, 249–255 (2015)
21. L. Galli, S.-K. Son, T. R. Barends, T. A. White, A. Barty, et al., Towards phasing using high x-ray intensity, IUCrJ 2, 627–634 (2015)
20. B. Ziaja, Z. Jurek, N. Medvedev, V. Saxena, S.-K. Son, et al., Towards realistic simulations of macromolecules irradiated under the conditions of coherent diffraction imaging with an x-ray free-electron laser, Photonics 2, 256–269 (2015)
19. L. Galli, S.-K. Son, M. Klinge, S. Bajt, A. Barty, et al., Electronic damage in S atoms in a native protein crystal induced by an intense x-ray free-electron laser pulse, Struct. Dyn. 2, 041703 (2015) [special issue on biology with x-ray lasers 2]

2014

18. S.-K. Son, R. Thiele, Z. Jurek, B. Ziaja, and R. Santra, Quantum-mechanical calculation of ionization potential lowering in dense plasmas, Phys. Rev. X 4, 031004 (2014)
17. B. Murphy, T. Osipov, Z. Jurek, L. Fang, S.-K. Son, et al., Femtosecond x-ray-induced explosion of C₆₀ at extreme intensity, Nat. Commun. 5, 4281 (2014)
16. J. M. Slowik, S.-K. Son, G. Dixit, Z. Jurek, and R. Santra, Incoherent x-ray scattering in single molecule imaging, New J. Phys. 16, 073042 (2014)

2013

15. L. Müller, C. Gutt, B. Pfau, S. Schaffert, J. Geilhufe, et al., Breakdown of the x-ray resonant magnetic scattering signal during intense pulses of extreme ultraviolet free-electron-laser radiation, Phys. Rev. Lett. 110, 234801 (2013)
14. H. Fukuzawa, S.-K. Son, K. Motomura, S. Mondal, K. Nagaya, et al., Deep inner-shell multiphoton ionization by intense x-ray free-electron laser pulses, Phys. Rev. Lett. 110, 173005 (2013)
13. B. Rudek, D. Rolles, S.-K. Son, L. Foucar, B. Erk, et al., Resonance-enhanced multiple ionization of krypton at an x-ray free-electron laser, Phys. Rev. A 87, 023413 (2013)
12. B. Ziaja, Z. Jurek, N. Medvedev, S.-K. Son, R. Thiele, et al., Photoelectron spectroscopy method to reveal ionization potential lowering in nanoplasmas, J. Phys. B: At. Mol. Opt. Phys. 46, 164009 (2013) [special issue on frontiers of free-electron laser science]
11. S.-K. Son, H. N. Chapman, and R. Santra, Determination of multiwavelength anomalous diffraction coefficients at high x-ray intensity, J. Phys. B: At. Mol. Opt. Phys. 46, 164015 (2013) [special issue on frontiers of free-electron laser science]
10. K. Motomura, H. Fukuzawa, S.-K. Son, S. Mondal, T. Tachibana, et al., Sequential multiphoton multiple ionization of atomic argon and xenon irradiated by x-ray free-electron laser pulses at SACLA, J. Phys. B: At. Mol. Opt. Phys. 46, 164024 (2013) [special issue on frontiers of free-electron laser science]
9. S. Bhardwaj, S.-K. Son, K.-H. Hong, C.-J. Lai, F. X. Kärtner, et al., Recombination-amplitude calculations of noble gases, in both length and acceleration forms, beyond the strong-field approximation, Phys. Rev. A 88, 053405 (2013)

2012

8. A. Sytcheva, S. Pabst, S.-K. Son, and R. Santra, Enhanced nonlinear response of Ne⁸⁺ to intense ultrafast x rays, Phys. Rev. A 85, 023414 (2012)
7. B. Rudek, S.-K. Son, L. Foucar, S. W. Epp, B. Erk, et al., Ultra-efficient ionization of heavy atoms by intense x-ray free-electron laser pulses, Nat. Photon. 6, 858–865 (2012)
6. R. W. Dunford, S. H. Southworth, D. Ray, E. P. Kanter, B. Krässig, et al., Evidence for interatomic Coulombic decay in Xe K-shell-vacancy decay of XeF₂, Phys. Rev. A 86, 033401 (2012)
5. S.-K. Son and R. Santra, Monte Carlo calculation of ion, electron, and photon spectra of xenon atoms in x-ray free-electron laser pulses, Phys. Rev. A 85, 063415 (2012)
4. R. Thiele, S.-K. Son, B. Ziaja, and R. Santra, Effect of screening by external charges on the atomic orbitals and photoinduced processes within the Hartree-Fock-Slater atom, Phys. Rev. A 86, 033411 (2012)

2011

3. S.-K. Son, L. Young, and R. Santra, Impact of hollow-atom formation on coherent x-ray scattering at high intensity, Phys. Rev. A 83, 033402 (2011)
2. G. Doumy, C. Roedig, S.-K. Son, C. I. Blaga, A. D. DiChiara, et al., Nonlinear atomic response to intense ultrashort x rays, Phys. Rev. Lett. 106, 083002 (2011)
1. S.-K. Son, H. N. Chapman, and R. Santra, Multiwavelength anomalous diffraction at high x-ray intensity, Phys. Rev. Lett. 107, 218102 (2011)

What happens to atoms and molecules during x-ray free-electron laser pulses? by S.-K. Son MPC-AS seminar (Max Planck Center for Attosecond Science, POSTECH, Pohang, Korea, November 23, 2012) [oral presentation] Seminar on Dynamical Aspects of Theoretical Chemistry (Department of Chemistry, Free University of Berlin, Berlin, Germany, November 19, 2015) [invited talk] Physical Colloquium (Institute of Physics, University of Kassel, Kassel, Germany, December 3, 2015) [invited talk] Physics and Photon Science Colloquium (Department of Physics and Photon Science, GIST, Gwangju, Korea, October 18, 2016) [invited talk] European XFEL Theory Seminar (European XFEL, Schenefeld, Germany, June 22, 2017) [invited talk] Special seminar (Department of Chemistry, KAIST, Daejeon, Korea, October 31, 2018) [oral presentation] Physics/BK21+ Seminar (Department of Physics, POSTECH, Pohang, Korea, July 15, 2019) [invited talk] Physics Seminar (Department of Physics, UNIST, Ulsan, Korea, July 16, 2019) [invited talk] Seminar (Laboratory for Laser Energetics, University of Rochester, Rochester, New York, United States, September 14, 2021) [invited talk]

Multiple-core-hole resonance spectroscopy with ultraintense X-ray pulses by S.-K. Son in CFEL-DESY Theory Seminar (CFEL, DESY, Hamburg, Germany, September 20, 2023) [oral presentation]

Breakdown of frustrated absorption in x-ray sequential multiphoton ionization by S.-K. Son in CFEL-DESY Theory Seminar (CFEL, DESY, Hamburg, Germany, April 1, 2020) [oral presentation]

Theoretical study of strong-field multiphoton ionization of polyatomic molecules: a new time-dependent Voronoi-cell finite difference method by S.-K. Son in CFEL Seminar (CFEL, DESY, Hamburg, Germany, July 23, 2010) [oral presentation]

Theory of X-ray–matter interactions by S.-K. Son in Ultrafast X-ray Summer School (PULSE, Stanford, California, United States, June 15-22, 2020) [lecture]

Nonlinear atomic response to ultraintense and ultrashort x-ray pulses by G. Doumy, C. Roedig, S.-K. Son, C. I. Blaga, A. D. DiChiara, et al. in 75th Annual Meeting of the DPG and DPG Spring Meeting of the Section AMOP (German Physical Society, Dresden, Germany, March 13-18, 2011) [oral presentation]

Multiwavelength anomalous diffraction at high x-ray intensity by S.-K. Son, H. N. Chapman, and R. Santra in DPG Spring Meeting of the Section AMOP (German Physical Society, Stuttgart, Germany, March 12-16, 2012) [oral presentation]

Inner-shell multiphoton multiple ionization dynamics of xenon atoms by x-ray free-electron laser pulses by S.-K. Son and R. Santra in DPG Spring Meeting of the Section AMOP (German Physical Society, Hanover, Germany, March 18-22, 2013) [oral presentation]

Ultrafast ionization and fragmentation dynamics of molecules at high x-ray intensity by S.-K. Son The 47th Meeting of the Division of Atomic, Molecular and Optical Physics (American Physics Society, Providence, Rhode Island, United States, May 23-27, 2016) [invited talk] Korean Physical Society Fall Meeting (Korean Physical Society, Gwangju, Korea, October 19-21, 2016) [invited talk] The 7th Topical Conference of the Indian Society of Atomic and Molecular Physics (Indian Society of Atomic and Molecular Physics, Tirupati, India, January 6-8, 2018) [invited talk]

Relativistic and resonant effects on x-ray multiphoton multiple ionization of heavy atoms by S.-K. Son, K. Toyota, R. Santra, B. Rudek, A. Rudenko, et al. in 83rd Annual Meeting of the DPG and DPG Spring Meeting of the Section AMOP (German Physical Society, Rostock, Germany, March 11-15, 2019) [oral presentation]

Multiphoton multiple ionization dynamics of atoms and molecules at high x-ray intensity by S.-K. Son The 3rd CQSE International Workshop on Atomic, Molecular, and Ultrafast Science and Technology (National Taiwan University, Taipei, Taiwan, January 7-8, 2012) [invited talk] International Workshop on Intense-field Short-wavelength Atomic and Molecular Processes (Hamburg, Germany, July 18-20, 2015) [invited talk] 4th CFEL Symposium 2015 (CFEL, Timmendorfer Strand, Germany, September 30-October 2, 2015) [oral presentation] The electronic-structure problem in theoretical strong-field physics (ITAMP, Harvard University, Cambridge, Massachusetts, United States, October 10-14, 2016) [invited talk] Workshop on Science of “From Matter to Materials and Life” (Hamburg, Germany, December 14-16, 2016) [oral presentation] New trends in theory for experiments at advanced light sources (European XFEL and CFEL, Schenefeld and Hamburg, Germany, November 29-December 1, 2017) [invited talk] Light-Matter Interaction: Recent Advances in Theory (DESY, Hamburg, Germany, January 25, 2018) in Satellite Workshop of European XFEL and DESY Photon Science Users' Meeting 2018 [invited talk] Attosecond Physics at the Nanoscale (Center for Theoretical Physics of Complex Systems, Institute for Basic Science, Daejeon, Korea, October 29-November 2, 2018) [invited talk] Workshop on Science of “From Matter to Materials and Life” (Dresden, Germany, February 13-15, 2019) [oral presentation] 28th Annual International Laser Physics Workshop (Gyeongju, Korea, July 8-12, 2019) [invited talk]

Multiwavelength anomalous diffraction at high x-ray intensity by S.-K. Son New Science Opportunities at FLASH (DESY, Hamburg, Germany, October 12-14, 2011) [oral presentation] Ultrafast Dynamic Imaging of Matter (Banff, Canada, July 1-3, 2012) [oral presentation] The 24th PLS Synchrotron Radiation Users' Workshop (POSTECH, Pohang, Korea, November 22, 2012) [invited talk] Workshop on Resonant Elastic X-ray Scattering in Condensed Matter (Oxford, United Kingdom, July 15-19, 2013) [invited talk] Photoionization and Photodetachment (Gordon Research Conference, Galveston, Texas, United States, February 23-28, 2014) [invited talk] 8th International Workshop on X-ray Radiation Damage to Biological Crystalline Samples (Hamburg, Germany, April 10-12, 2014) [invited talk] CCP4 Study Weekend (Nottingham, United Kingdom, January 7-9, 2015) [invited talk] BioXFEL STC 2nd Annual International Conference (Ponce, Puerto Rico, January 14-16, 2015) [invited talk]

Quantum-mechanical calculation of ionization potential lowering in dense plasmas by S.-K. Son, R. Thiele, Z. Jurek, B. Ziaja, and R. Santra Radiative Properties of Hot Dense Matter (Vienna, Austria, September 29-October 3, 2014) [oral presentation] Average Atom Models for Warm Dense Matter (University of California, Berkeley, Berkeley, California, United States, June 28-29, 2021) [invited talk]

Resonances in x-ray multiphoton ionization by S.-K. Son in Molecular quantum dynamics beyond bound states (Institute of Physics, Rostock University, Rostock, Germany, March 10-12, 2021) [invited talk]

Relativistic effects in x-ray multiphoton ionization dynamics by S.-K. Son in 13th International Conference on Relativistic Effects in Heavy-Element Chemistry and Physics (Assisi, Italy, September 26-30, 2022) [invited talk]

Posters

XATOM: an integrated toolkit for X-ray and atomic physics by S.-K. Son and R. Santra 1st CFEL Symposium 2011 (CFEL, Sylt, Germany, March 18-20, 2011) [poster] The 17th International Conference on Atomic Processes in Plasmas (Queen's University, Belfast, United Kingdom, July 19-22, 2011) [poster] The 3rd CQSE International Workshop on Atomic, Molecular, and Ultrafast Science and Technology (National Taiwan University, Taipei, Taiwan, January 7-8, 2012) [poster] Photoions, Photoionization and Photodetachment (Gordon Research Conference, Galveston, Texas, US, February 12-17, 2012) [poster] 3rd CFEL Symposium 2013 (CFEL, Timmendorfer Strand, Germany, October 1-3, 2013) [poster] The Hamburg Centre for Ultrafast Imaging International Symposium 2013 (CUI, Hamburg, Germany, November 13-15, 2013) [poster]

Giant x-ray multiphoton ionization of atoms and molecules by S.-K. Son, K. Toyota, L. Inhester, Y. Hao, K. Hanasaki, et al. Multiphoton Processes (Gordon Research Conference, Bryant University, Rhode Island, US, June 24-29, 2018) [poster] European XFEL and DESY Photon Science Users' Meeting (DESY, Hamburg, Germany, January 23-25, 2019) [poster]

Resonance-enhanced multiphoton ionization in the x-ray regime by S.-K. Son, A. C. LaForge, D. Mishra, M. Ilchen, S. Duncanson, et al. XXXII International Conference on Photonic, Electronic and Atomic Collisions (virtual, July 20-23, 2021) [poster] Workshop on Science of “From Matter to Materials and Life” (virtual, November 22-24, 2021) [poster]

Unusual phenomena in x-ray multiphoton ionization of atoms by S.-K. Son and R. Santra in Science at FELs (DESY and European XFEL, Hamburg, Germany, September 19-23, 2022) [poster]

Multiple-core-hole resonance spectroscopy with ultraintense x-ray pulses by S.-K. Son, A. Rörig, T. Mazza, P. Schmidt, T. Baumann, et al. Workshop on Science of “From Matter to Materials and Life” (University of Jena, Jena, Germany, September 27-29, 2023) [poster] International Conference on Many Particle Spectroscopy of Atoms, Molecules, Clusters and Surfaces (Fudan University, Shanghai, China, April 23-26, 2024) [poster]

Quantum-state-resolved ionization dynamics induced by x-ray free-electron laser pulses by S.-K. Son, L. Budewig, and R. Santra in International Workshop on Ultra-Fast Science (East China Normal University, Shanghai, China, April 21-23, 2024) [poster]

Impact of hollow-atom formation on coherent x-ray scattering at high intensity by S.-K. Son, L. Young, and R. Santra European XFEL and HASYLAB Users' Meeting (DESY, Hamburg, Germany, January 26-28, 2011) [poster] 75th Annual Meeting of the DPG and DPG Spring Meeting (German Physical Society, Dresden, Germany, March 13-18, 2011) [poster]

Multiwavelength anomalous diffraction at high x-ray intensity by S.-K. Son, H. N. Chapman, and R. Santra European XFEL and HASYLAB Users' Meeting (DESY, Hamburg, Germany, January 25-27, 2012) [poster] Science at FELs (DESY, Hamburg, Germany, July 15-18, 2012) [poster]

High-intensity phasing with x-ray free-electron lasers by S.-K. Son, L. Galli, H. N. Chapman, and R. Santra in European XFEL and DESY Photon Science Users' Meeting (DESY, Hamburg, Germany, January 28-30, 2015) [poster]

Quantum-mechanical calculation of ionization-potential lowering in dense plasmas by S.-K. Son, R. Thiele, Z. Jurek, B. Ziaja, and R. Santra in European XFEL and DESY Photon Science Users' Meeting (DESY, Hamburg, Germany, January 29-31, 2014) [poster]

Participations by colleagues

C. Roedig et al., FiO/LS (2011) A. Sytcheva et al., DPG (2012) R. W. Dunford et al., DPG (2012) B. Rudek et al., DPG (2012) D. Ray et al., DAMOP (2012) S. Bhardwaj et al., CLEO (2012) L. Müller et al., Science at FELs (2012) R. Thiele et al., PHEDM (2013) H. Fukuzawa et al., ICPEAC (2013) B. Ziaja et al., DPP (2013) J. M. Slowik et al., DPG (2014) V. Saxena et al., DPG (2014) H. Fukuzawa et al., UP (2014) Y. Hao et al., DPG (2015) K. Hanasaki et al., FEMTO12 (2015) M. M. Abdullah et al., ICPEAC (2015) B. Ziaja et al., DPG (2016) L. Inhester et al., DPG (2016) K. Toyota et al., DPG (2016)

L. Inhester et al., DPG (2017) K. Toyota et al., DPG (2017) K. Hanasaki et al., SCKD (2017) L. Inhester et al., DPG (2018) J. M. Schäfer et al., DPG (2018) J. J. Bekx et al., DPG-SKM (2018) M. M. Abdullah et al., UP (2018) A. Trabattoni et al., UP (2018) D. Kolbasova et al., UP (2018) J. M. Schäfer et al., UP (2018) L. Inhester et al., UP (2018) L. Inhester et al., ICPEAC (2019) J. J. Bekx et al., Users' Meeting (2020) L. Inhester et al., ViCPEAC (2021) D. Kolbasova et al., ViCPEAC (2021) A. Rörig et al., ViCPEAC (2021) A. Rörig et al., Science at FELs (2022) L. Budewig et al., DASHH Evaluation (2023)

Supervision (co-supervision with Robin Santra)

Jul. 2024 ~ Sep. 2024	Yannick Seif, DESY Summer Student, DESY, Germany
Nov. 2023 ~ present	Mojgan Soltani, Ph.D. Student, Dept. of Physics, Uni. Hamburg, Germany
Oct. 2021 ~ Nov. 2024	Laura Budewig, Ph.D. Student, Dept. of Physics, Uni. Hamburg, Germany
Nov. 2020 ~ Jun. 2021	Dr. John Jasper Bekx, Post-Doctoral Fellow, CFEL, DESY, Germany
Mar. 2020 ~ Sep. 2021	Laura Budewig, Master Student, Dept. of Physics, Uni. Hamburg, Germany
Oct. 2018 ~ Sep. 2022	Dr. Rui Jin, Post-Doctoral Fellow, CFEL, DESY, Germany
Jul. 2018 ~ Sep. 2018	Tanakrit Mamee, DESY Summer Student, DESY, Germany
Oct. 2017 ~ Dec. 2021	Julia Schäfer, Ph.D. Student, Dept. of Chemistry, Uni. Hamburg, Germany
Aug. 2017 ~ Aug. 2021	Daria Kolbasova, Ph.D. Student, Dept. of Physics, Uni. Hamburg, Germany
Jan. 2017 ~ Jul. 2017	Julia Schäfer, Master Student, Dept. of Chemistry, Uni. Tübingen, Germany
Jul. 2016 ~ Sep. 2016	Daria Kolbasova, DESY Summer Student, DESY, Germany
Apr. 2015 ~ Jul. 2018	Dr. Koudai Toyota, Post-Doctoral Fellow, CFEL, DESY, Germany
Oct. 2014 ~ Sep. 2019	Dr. Ludger Inhester, Post-Doctoral Fellow, CFEL, DESY, Germany
Jul. 2014 ~ Sep. 2014	Dmitrii Shedogubov, DESY Summer Student, DESY, Germany
Aug. 2014 ~ Apr. 2016	Dr. Kota Hanasaki, Post-Doctoral Fellow, Dept. of Physics, Uni. Hamburg, Germany
Jan. 2014 ~ Dec. 2014	Dr. Yajiang Hao, Post-Doctoral Fellow, CFEL, DESY, Germany
Jul. 2013 ~ Sep. 2013	Ekaterina Staroselskaya (Kuzmina), DESY Summer Student, DESY, Germany
Jul. 2013 ~ Dec. 2013	Muhammad Saqib, Ph.D. Student, Dept. of Physics, Uni. Hamburg, Germany

• Organizer, CFEL Theory Seminar and CFEL-DESY Theory Seminar (Jan. 2013 ~ present)
• Co-organizer, Ultrafast X-ray Summer Seminar 2014 (Stanford, Jun. 2014) [UXSS 2014]
• Organizer, Ultrafast X-ray Summer School 2015 (Hamburg, Jun. 2015) [UXSS 2015]
• Co-organizer, XFEL-Matter Interaction: Recent Advances in Theory (Hamburg, Jan. 2016) [Satellite Meeting of DESY Photon Science Users' Meeting 2016]
• Lecturer, DESY Summer Student Lecture “Fundamentals of x-ray interaction with matter” (Hamburg, Jul. 2015, Jul./Aug. 2016, Aug. 2017, Aug. 2018, Aug. 2019, Aug. 2021, Jul. 2022, Aug. 2023, and Aug. 2024)
• Lecturer, “The Basis of Modern Molecular Physics” (with Jochen Küpper, Tim Laarmann, and Sebastian Trippel), Universität Hamburg (Hamburg, winter semester in 2016/2017)
• Lecturer for IMPRS-UFAST core course, “Theory of electronic structure and molecular dynamics,” IMPRS-UFAST, (Hamburg, Jan./Feb. 2017)
• Lecturer for IMPRS-UFAST core course, “Theory of electronic structure and molecular dynamics,” IMPRS-UFAST, (Hamburg, May./Jun. 2018)
• Lecturer for UXSS, “Theory of x-ray–matter interactions,” Ultrafast X-ray Summer School 2020 (PULSE, Stanford, Jun. 2020) [UXSS 2020] [YouTube]

• Referee for Astrophysical Journal, IUCrJ, Journal of Applied Crystallography, Journal of Chemical Physics, Journal of the Optical Society of America B, Journal of Physics B, Journal of Physical Chemistry, Journal of Physical Chemistry Letters, Molecules, Nature Physics, Physical Review A, Physical Review B, Physical Review X, Physical Review Letters, Physical Review Research, Physica Scripta, Physics of Plasmas, Results in Physics, and Scientific Reports
• Member of the AMO scientific advisory committee on Shanghai XFELs (2021 ~ present)
• Member of the editorial board for the DESY Photon Science Annual Reports (2017 ~ present)
• Member of the examination commission for Ph.D. thesis of Laura Budewig, Dept. of Physics, Universität Hamburg (November 2024)
• Member of the examination commission for Ph.D. thesis of Daria Kolbasova, Dept. of Physics, Universität Hamburg (August 2021)
• Opponent of the examination commission for Ph.D. thesis of Jesper Norell, Dept. of Physics, Stockholm University (April 2020)
• Member of the examination commission for Ph.D. thesis of Vinicius Silva de Oliveira, Dept. of Physics, Universität Hamburg (May 2019)