A package for the abinitio calculation of one and twophoton cross sections of twoelectron atoms, using a CI Bsplines method
Abstract
A package is presented for the fully abinitio calculation of one and twophoton ionization cross sections for twoelectron atomic systems (H ^{}, He, Mg, Ca, …) under strong laser fields, within lowestorder perturbation theory (LOPT) and in the dipole approximation. The atomic structure is obtained through configuration interaction (CI) of antisymmetrized twoelectron states expanded in a Bspline finite basis. The formulation of the theory and the relevant codes presented here represent the accumulation of work over the last ten years [111,1315]. Extensions to more than twophoton ionization is straightforward. Calculation is possible for both the length and velocity form of the laseratom interaction operator. The package is mainly, written in standard FORTRAN language and uses the publicly available libraries SLATEC, LAPACK and BLAS.
 Publication:

Computer Physics Communications
 Pub Date:
 February 2003
 DOI:
 10.1016/S00104655(02)006847
 Bibcode:
 2003CoPhC.150..140N