Time-dependent R -matrix calculations for multiphoton ionization of argon atoms in strong laser pulses
Abstract
A recently developed [Guan , Phys. Rev. A 76, 053411 (2007)] general ab initio and nonperturbative method to solve the time-dependent Schrödinger equation (TDSE) for the interaction of a strong attosecond laser pulse with a general atom is applied to multiphoton ionization of argon atoms. The field-free Hamiltonian and the dipole matrices are generated using a flexible B -spline R -matrix method, which allows for the use of nonorthogonal sets of one-electron orbitals. The solution of the TDSE is propagated in time using the Arnoldi-Lanczos method. The effects of the pulse length and the laser intensity on the ionization rate for different photon energies are analyzed. In the long-pulse regime, good agreement with predictions from R -matrix Floquet calculations is achieved.
- Publication:
-
Physical Review A
- Pub Date:
- November 2008
- DOI:
- 10.1103/PhysRevA.78.053402
- Bibcode:
- 2008PhRvA..78e3402G
- Keywords:
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- 32.80.Fb;
- Photoionization of atoms and ions