General approach to few-cycle intense laser interactions with complex atoms

Journal Article · Thu Nov 15 04:00:00 EST 2007 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.76.053411· OSTI ID:21028031

Xiaoxu, Guan; Zatsarinny, O; Bartschat, K ^[1]; Schneider, B I ^[2]; Feist, J ^[3]; Noble, C J ^[1]

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1. Department of Physics and Astronomy, Drake University, Des Moines, Iowa 50311 (United States)
2. Physics Division, National Science Foundation, Arlington, Virginia 22230 (United States)
3. Institute for Theoretical Physics, Vienna University of Technology, A-1040 Vienna (Austria)

A general ab initio and nonperturbative method to solve the time-dependent Schroedinger equation (TDSE) for the interaction of a strong attosecond laser pulse with a general atom, i.e., beyond the models of quasi-one-electron or quasi-two-electron targets, is described. The field-free Hamiltonian and the dipole matrices are generated using a flexible B-spline R-matrix method. This numerical implementation enables us to construct term-dependent, nonorthogonal sets of one-electron orbitals for the bound and continuum electrons. The solution of the TDSE is propagated in time using the Arnoldi-Lanczos 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 two-photon ionization is achieved.

• OSTI ID: 21028031
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 5 Vol. 76; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ATOMS
COMPLEXES
CROSS SECTIONS
DIPOLES
ELECTRONS
EXCITATION
HAMILTONIANS
INTERACTIONS
LASER RADIATION
MATHEMATICAL SOLUTIONS
MULTI-PHOTON PROCESSES
NEON
PERTURBATION THEORY
PHOTOIONIZATION
PHOTON-ATOM COLLISIONS
R MATRIX
SCHROEDINGER EQUATION
STRONG INTERACTIONS
TIME DEPENDENCE