Physical Review Letters

Electric Quadrupole Transitions in Multiphoton Ionization

P. Lambropoulos, Gary D. Doolen, Steven P. Rountree

Published Mar 17, 1975• 48 citations

Abstract

It is shown that even for optical frequencies the dipole approximation is not always valid in multiphoton ionization. For certain photon frequencies, we find quadrupole-dipole contributions which are several orders of magnitude larger than the usual dipole-dipole contribution to two-photon ionization.

DOI: 10.1103/physrevlett.34.636

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Physical Review Letters

Electric Quadrupole Transitions in Multiphoton Ionization

P. Lambropoulos, Gary D. Doolen, Steven P. Rountree

Published Mar 17, 1975• 48 citations

Publisher

Abstract

DOI: 10.1103/physrevlett.34.636

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5p

state is measured.

{\mathrm{}}^{2}

{D}_{3/2}

and 6d

{\mathrm{}}^{2}

{D}_{5/2}

electric quadrupole transitions and for one-photon resonant, three-photon ionization via the 5d

{\mathrm{}}^{2}

{\mathrm{D}}_{3/2}

and 5d

{\mathrm{}}^{2}

{D}_{5/2}

transitions. The ratios of the total ionization rates for linearly and circularly polarized light have also been measured for the 6d

{\mathrm{}}^{2}

{\mathrm{D}}_{3/2}

and 6d

{\mathrm{}}^{2}

{D}_{5/2}

states. A theoretical analysis and detailed comparison with the experimental results are given.