# FIRST MICROWAVE SPECTRA IN DOPED HELIUM CLUSTERS

Please use this identifier to cite or link to this item: http://hdl.handle.net/1811/18979

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 Title: FIRST MICROWAVE SPECTRA IN DOPED HELIUM CLUSTERS Creators: Reinhard, I.; Callegari, C.; Lehmann, K. K.; Scoles, G. Issue Date: 1998 Publisher: Ohio State University Abstract: In the framework of the investigation of the relaxation mechanisms of molecular rotational and vibrational excitations in a superfluid helium cluster environment, the first microwave absorption spectra have been obtained for He clusters doped with acetonitrile $(CH_{3}CN)$. Two broad $(\approx 1 GHz)$ peaks centered at about 12.5 and 15 GHz have been observed using bolometric detection of the beam attenuation caused by successive absorption of several microwave photons in a 10 cm long waveguide. The change in rotational constants induced by the presence of the medium preclude assignment based on a mere comparison with gas phase spectra. Further measurements are currently in progress to assign the observed features and determine the rotational relaxation times of the system. Description: Author Institution: Department of Chemistry, Princeton University URI: http://hdl.handle.net/1811/18979 Other Identifiers: 1998-RJ-03