Deviations from Kleinman symmetry measured for several simple atoms and molecules
- 1 May 1985
- journal article
- Published by American Physical Society (APS) in Physical Review A
- Vol. 31 (5), 3145-3154
- https://doi.org/10.1103/physreva.31.3145
Abstract
Deviations from Kleinman symmetry for the second hyperpolarizability tensors of some simple atoms and molecules (He, Ar, Kr, Xe, , , , , , , , , , , and ) have been measured down to the 0.1% level of accuracy at several frequencies far below the first strong electronic resonance, by means of dc-electric-field–induced second-harmonic generation (ESHG). The results of the experiment are discussed within the framework of several models. The observed Kleinman-symmetry deviations are small compared to the electronic dispersion, and appear to be dominated by electronic rather than vibrational contributions. However, vibrations are shown to play a role in the case of , and the results observed for and differ significantly. The observed deviation for He is relatively large and should provide a sensitive test of ab initio calculations.
Keywords
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