A discrete time-dependent method for metastable atoms in intense fields

Details A discrete time-dependent method for metastable atoms in intense fields A discrete time-dependent method for metastable atoms in intense fields

2004-02-20

arxiv.org/abs/physics/0402108v1

J. Chem. Phys 120 (2004) 10046

Physics

Atomic Physics

10 pages, 9 figure, 4 tables

Scientific paper

10.1063/1.1735662

The full-dimensional time-dependent Schrodinger equation for the electronic dynamics of single-electron systems in intense external fields is solved directly using a discrete method. Our approach combines the finite-difference and Lagrange mesh methods. The method is applied to calculate the quasienergies and ionization probabilities of atomic and molecular systems in intense static and dynamic electric fields. The gauge invariance and accuracy of the method is established. Applications to multiphoton ionization of positronium and hydrogen atoms and molecules are presented. At very high intensity above saturation threshold, we extend the method using a scaling technique to estimate the quasienergies of metastable states of the hydrogen molecular ion. The results are in good agreement with recent experiments.

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