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Physical Review B 52 (1995) 12677-12680
Two-photon spectroscopy between states of opposite parities
M. Daoud1, M. Kibler1

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).
1 :  IPNL - Institut de Physique Nucléaire de Lyon
Physique/Physique/Physique Atomique
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