Precision calculation of intense-laser-field multiphoton ionization (MPI) rates of H₂⁺ at critical internuclear distances

Sang-Kil Son and Shih-I Chu

[BibTeX][slide: 693kb]http://meetings.aps.org/link/BAPS.2006.DAMOP.W1.64

We extend the time-independent non-Hermitian Floquet formalism [1] for high precision calculation of the MPI rates of H₂⁺ at internuclear distances (R) from 2.0 to 20.0 a.u. in intense laser fields with intensity 1 × 10¹⁴ W/cm² and wavelength 791 nm. The procedure involves the use of the complex-scaling generalized pseudospectral (CSGPS) method for non-uniform spatial discretization of the Hamiltonian expressed in prolate spheroidal coordinates. We found that the MPI rates strongly depend upon R and are significantly enhanced at several critical distances (R ~  8, 11, and 15 a.u.) in good agreement with the recent experimental results [2]. [1] S. I. Chu and D. A. Telnov, Phys. Rep. 390, 1 (2004). [2] D. Pavičić, A. Kiess, T. W. Hänsch, and H. Figger, Phys. Rev. Lett. 94, 163002 (2005).

Tags: Floquet, diatomic molecule, H2+, strong-field, MPI, KU

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