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We have built an apparatus capable of attaching a molecule to a liquid-helium cluster and obtaining its infrared spectrum. Clusters made of a few thousand atoms and containing an SF₆ molecule show two absorptions located at 945. 8 and 946. 1 cm^-1 which indicate that the guest molecule is located near the surface of the cluster. If the cluster contains two SF₆ molecules, the spectrum obtained is that of a slightly perturbed SF₆ dimer.
Goyal et al. (Mon,) studied this question.
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