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Gas-phase Raman spectra of the diatoms ³He₂ and ⁴He₂ are measured, the former for the first time. The depolarized spectra of the collisional pairs are in near agreement with computations based on a recent configuration-interaction calculation of the helium-diatom polarizability (anisotropic part). The polarized spectra, however, require a somewhat more substantial trace than the configuration-interaction prediction. Measurements of the second virial dielectric coefficient support this conclusion.
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Proffitt et al. (1980) studied this question.
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