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The permanent moment contribution to two-photon absorption

✍ Scribed by D.P. Craig; T. Thirunamachandran

Publisher
Elsevier Science
Year
1988
Tongue
English
Weight
290 KB
Volume
148
Category
Article
ISSN
0009-2614

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✦ Synopsis

The matrix elements for two-photon transitions involve a sum over intermediate states. It is well known that where the initial and/or final states have permanent electric moments these appear in the sum, and contribute to the transition rate. For irradiation with different frequencies, the behaviour when one frequency is very low is of interest both theoretically and practically. In the frequency region beyond the perturbation theory limit we find, for beams of constant irradiance, that frequency change towards the zero limit gives no enhancement of intensity. Formulae are given for the various probabilities.

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