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Journal of Physics B Atomic and Molecular Physics

Polarization effect in multiphoton ionization of hydrogen from metastable 2S state

Bhaskar J. Choudhury

Published Nov 1, 1973• 2 citations
Publisher

Abstract

A general analytical result has been obtained for multiphoton ionization of hydrogen from metastable 2S state. Numerical results are given for the ratio of cross sections of ionization by linearly polarized and circularly polarized light for N=2,3,4 (where N is the number of photons absorbed). In all these cases the cross section for linearly polarized light dominates over the cross section for circularly polarized light.

DOI
10.1088/0022-3700/6/11/019

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A general analytical result has been obtained for multiphoton ionization of hydrogen from metastable 2S state. Numerical results are given for the ratio of cross sections of ionization by linearly polarized and circularly polarized light for N=2,3,4 (where N is the number of photons absorbed). In all these cases the cross section for linearly polarized light dominates over the cross section for circularly polarized light.
The ratio ${\ensuremath{\mu}}_{N}$ of the cross section for circularly polarized light to that for linearly polarized is numerically investigated for NNN-photon ionization of atomic hydrogen. For N<4N<4N<4, it appears that the gain factor is greater than unity. For $N\ensuremath{\ge}4$, the ratio ${\ensuremath{\mu}}_{N}$ is generally smaller than unity and decreases when the multiphoton order NNN increases.
Multipole interference effects are predicted in the generalized cross sections, and in the ratio $\frac{{\stackrel{^}{\ensuremath{\sigma}}}_{C}}{{\stackrel{^}{\ensuremath{\sigma}}}_{L}}$ of the cross sections for circularly and linearly polarized laser light for the case of the two-photon ionization of the n=2n=2n=2 singlet metastable helium atoms in the wavelength range 5036-5050 \AA{}.
The theory of two-photon ionization of a hydrogenic state in the nonrelativistic dipole approximation is generalized for elliptically polarized light. An application to the metastable 2S state of atomic hydrogen is made. Significant differences in the angular distribution of the outgoing electrons are found depending upon the polarization of the photons. It is claimed that two-photon ionization employing elliptically polarized photons from lasers may provide an additional test for the theories of multiphoton ionization.