ROTATIONAL SPECTROSCOPY OF SINGLE CARBONYL SULFIDE MOLECULES EMBEDDED IN SUPERFLUID HELIUM NANODROPLETS

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The pure rotation spectrum of carbonyl sulfide embedded in superfluid helium nanodroplets was measured in the frequency range from 4 to 15.5{\nobreakspace}GHz. Four lines, corresponding to the \textit{J} = 1-0, \textit{J} = 2-1, \textit{J} = 3-2, and \textit{J} = 4-3 transitions were found. The line widths increase with \textit{J}, and are about twice that of the corresponding rovibrational lines}Grebenev, M. Hartmann, M.{\nobreakspace}Havenith, B. Sartakov, J.{\nobreakspace}P. Toennies, and A.{\nobreakspace}F. Vilesov, \textit{J. Chem. Phys.}, \textbf{112}, 4485 (2000).}, indicating faster rotational relaxation within the ground vibrational manifold. The comparison of the pure rotational spectrum with the microwave-infrared double resonance spectrum}Grebenev, M.{\nobreakspace}Havenith, F.{\nobreakspace}Madeja, J.{\nobreakspace}P. Toennies, and A.{\nobreakspace}F. Vilesov, \textit{J. Chem. Phys.}, \textbf{113}, 9060 (2000).} reveals that the double resonance measurement mainly probes rotational transitions within the upper vibrational manifold.

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S. S.
Author Institution: \textit{Department of Chemistry, University of Alberta, Edmonton, Alberta T6G-2G2, Canada}

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