Two-Photon Spectroscopy Between States of Opposite Parities

Details Two-Photon Spectroscopy Between States of Opposite Parities Two-Photon Spectroscopy Between States of Opposite Parities

1995-11-29

arxiv.org/abs/atom-ph/9511002v1

Physics

Atomic Physics

7 pages, Revtex File, to be published in Physical Review B

Scientific paper

10.1103/PhysRevB.52.12677

Magnetic- and electric-dipole two-photon absorption (MED-TPA), recently introduced as a new spectroscopic technique for studying transitions between states of opposite parities, is investigated from a theoretical point of view. A new approximation, referred to as {\it weak quasi-closure approximation}, is used together with symmetry adaptation techniques to calculate the transition amplitude between states having well-defined symmetry properties. Selection rules for MED-TPA are derived and compared to selection rules for parity-forbidden electric-dipole two-photon absorption (ED-TPA).

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