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dc.creatorStewart, Jacob T.en_US
dc.creatorBrumfield, Brian E.en_US
dc.creatorGibson, Bradley M.en_US
dc.creatorMcCall, Benjamin J.en_US
dc.date.accessioned2012-07-09T19:12:48Z
dc.date.available2012-07-09T19:12:48Z
dc.date.issued2012en_US
dc.identifier2012-FB-05en_US
dc.identifier.urihttp://hdl.handle.net/1811/52258
dc.descriptionAuthor Institution: Department of Chemistry, University of Illinois at Urbana-Champaign, Urbana, IL 61801; Departments of Chemistry and Astronomy, University of Illinois at Urbana-Champaign, Urbana, IL 61801.en_US
dc.descriptionBrian E. Brumfield present address: Department of Electrical Engineering, Princeton University, Princeton, Nj 08544en_US
dc.description.abstractSupersonic expansions are a useful tool for cooling molecules in the gas phase. While translational and rotational degrees of freedom can generally be cooled to low temperatures ($<$30 K) using this technique, there has been conflicting evidence concerning the cooling of vibrational degrees of freedom. This cooling is particularly important for gas-phase absorption spectroscopy of large molecules with many vibrational degrees of freedom, such as buckminsterfullerene (C$_{60}$). We have attempted gas-phase infrared spectroscopy of C$_{60}$ by producing C$_{60}$ vapor in a hot ($\sim$900 K) oven and seeding the vapor in an argon supersonic expansion, but have been unable to observe any absorption signal. We attribute this to insufficient cooling of vibrational degrees of freedom in the expansion. In contrast, we have performed a similar experiment with pyrene (C$_{16}$H$_{10}$) heated to $\sim$430 K, which yielded rotationally-resolved spectra and an estimated vibrational temperature of 25-90 K. We will discuss these results and possible methods to obtain gas-phase absorption spectra of C$_{60}$.en_US
dc.language.isoenen_US
dc.publisherOhio State Universityen_US
dc.titleVIBRATIONAL COOLING OF LARGE MOLECULES IN SUPERSONIC EXPANSIONS: THE CASE OF C$_{60}$ AND PYRENEen_US
dc.typeArticleen_US
dc.typeImageen_US
dc.typePresentationen_US


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