Multiphoton ionization of atoms on 2D and 3D spatial lattices

Journal Article · Sat May 01 04:00:00 EDT 1993 · Bulletin of the American Physical Society

OSTI ID:272799

Pindzola, M A ^[1]; Bottcher, C ^[2]

---

1. Auburn Univ., AL (United States)
2. Oak Ridge National Laboratory, TN (United States)

The two photon ionization rate for the Lithium atom is calculated by direct solution of the time dependent Schrodinger`s equation on a 2D cylindrical coordinate lattice. A variable mesh finite difference method is formulated. The ionization rates are found to be in good agreement with perturbation theory at low laser intensities, but are substantially smaller at the higher intensities. The three photon ionization rate for the Hydrogen atom is calculated by direct solution of the time dependent Schrodinger`s equation on a 3D cartesian coordinate lattice. Uniform mesh finite difference and finite element methods are formulated. The 3D lattice permits ionization rate calculations for both linear and circular polarized light. The ionization rates for the two different polarizations are found to be nearly equal for intensities a few times 10{sup 14} Watts/cm{sup 2}; in sharp contrast to the perturbation theory prediction of a factor of 10 difference. Numerical computations were performed on both a Cray Y-MP C90 and a 128 node Intel 860.

• OSTI ID: 272799
• Report Number(s): CONF-930557--
• Journal Information: Bulletin of the American Physical Society, Journal Name: Bulletin of the American Physical Society Journal Issue: 5 Vol. 38; ISSN BAPSA6; ISSN 0003-0503
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
FINITE DIFFERENCE METHOD
IONIZATION
LITHIUM
MULTI-PHOTON PROCESSES
THREE-DIMENSIONAL CALCULATIONS
TWO-DIMENSIONAL CALCULATIONS