General approach to fewcycle intense laser interactions with complex atoms
Abstract
A general ab initio and nonperturbative method to solve the timedependent Schrödinger equation (TDSE) for the interaction of a strong attosecond laser pulse with a general atom, i.e., beyond the models of quasioneelectron or quasitwoelectron targets, is described. The fieldfree Hamiltonian and the dipole matrices are generated using a flexible B spline R matrix method. This numerical implementation enables us to construct termdependent, nonorthogonal sets of oneelectron orbitals for the bound and continuum electrons. The solution of the TDSE is propagated in time using the ArnoldiLanczos method, which does not require the diagonalization of any large matrices. The method is illustrated by an application to the multiphoton excitation and ionization of Ne atoms. Good agreement with R matrix Floquet calculations for the generalized cross sections for twophoton ionization is achieved.
 Publication:

Physical Review A
 Pub Date:
 November 2007
 DOI:
 10.1103/PhysRevA.76.053411
 arXiv:
 arXiv:0704.3239
 Bibcode:
 2007PhRvA..76e3411G
 Keywords:

 32.80.Rm;
 32.80.Fb;
 Multiphoton ionization and excitation to highly excited states;
 Photoionization of atoms and ions;
 Physics  Atomic Physics;
 Physics  Computational Physics
 EPrint:
 7 pages (in the Phys. Rev. double column format) with 5 figures