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Importance of initial and final states as intermediate states in two-photon spectroscopy of polar molecules

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Dick, Bernhard ; Hohlneicher, Georg
Date of publication of this fulltext: 05 Aug 2009 13:50


Two-photon transitions may proceed via a mechanism not involving virtually excited intermediate states. This mechanism may account for the largest contribution to the 2-photon cross section in polar mols. if the dipole moment strongly alters with excitation. Possible consequences for the 2-photon detection of forbidden states in polar polyene systems are discussed.

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