# MOLECULAR ROTATION IN QUANTUM LIQUIDS

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 Title: MOLECULAR ROTATION IN QUANTUM LIQUIDS Creators: Sartakov, Boris G.; Vilesov, Andrey F.; Toennies, J. Peter Issue Date: 2003 Publisher: Ohio State University Abstract: Rotationally resolved IR spectra of molecules and hydrogen clusters trapped in $^{4}He$ and mixed $^{3}He/^{4}He$ droplets are presented. The newest analysis of spectra in terms of effective rotational constants of $OCS-(pH_{2})_{n}$ and $OCS-(oD_{2})_{n}$ complexes with $n=11,{\ldots}16$ is presented. Whereas molecular rotation in $^{4}He$ can be modelled by a free rotor with effective rotational constants the effect of interaction between a molecule and its H2 solvation shell is more pronounced. Analysis of the spectra within the frameworks of a rigid symmetric $H_{2}$ shell proves the inconsistency of the rigid shell model with the experimental observations. Furthermore it suggests existence of some low energy excitations $(E{\sim}0.1 cm^{-1})$ which are tentatively assigned to tunnelling states of the $H_{2}$ cluster. Description: Author Institution: General Physics Institute RAS; Department of Chemistry, University of Southern California; Department of Chemistry, Max-Planck-Institut fur Stromungsforschung URI: http://hdl.handle.net/1811/20848 Other Identifiers: 2003-RB-02