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Manuscript Title: The calculation of multiphoton ionization rates of the hydrogen molecular ion.
Authors: M. Plummer, J.F. McCann, L.B. Madsen
Program title: h2pacflo, h2pinit
Catalogue identifier: ADIZ_v1_0
Distribution format: tar.gz
Journal reference: Comput. Phys. Commun. 114(1998)94
Programming language: Fortran.
Computer: Silicon Graphics Origin.
RAM: 48M words
Peripherals: disc.
Keywords: H2+, Multiphoton ionization, Dissociative ionization, Laser field, Dc field, Floquet quasienergies, Floquet vectors, Density electron, Function, Laser physics, Molecular physics, Scattering, Photon.
Classification: 15, 16.6.

Nature of problem:
Multiphoton ionization of H2+ in intense (up to 10**14W cm**-2) laser fields over a range of internuclear distances and laser frequencies; DC field ionization of H2+ for comparable (and higher) field strengths.

Solution method:
Floquet theory ([1,2] and references) and basis set expansion of the wavefunction to form a complex-symmetric generalized eigenproblem.

Unusual features:
The program uses the publicly available libraries ARPACK [3] and LAPACK; the program uses the NAG library (mark 17); an option is provided for the IBM ESSL library.

Running time:
The test runs for h2pacflo take up to 30 s for the calculation of quasienergies for each frequency, intensity and internuclear distance; the test runs for h2pinit take 2-10 s.

[1] L.B. Madsen and M. Plummer, J. Phys. B: At. Mol. Opt. Phys. 31 (1998) 87.
[2] M. Plummer and J.F. McCann, J. Phys. B: At. Mol. Opt. Phys. 30 (1997) L401.
[3] URL: http://www.caam.rice.edu/software/ARPACK.