Electric Quadrupole Transitions in Multiphoton Ionization
- 17 March 1975
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 34 (11), 636-639
- https://doi.org/10.1103/physrevlett.34.636
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.Keywords
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