Cooling,Spectroscopy and Non‐Sticking of trans‐Stilbene and Nile Red |
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| Authors: | Julia Piskorski Dr David Patterson Sandra Eibenberger Prof John M Doyle |
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| Affiliation: | 1. Department of Physics, Harvard University, 17 Oxford St. Cambridge, MA 02143 (USA);2. Faculty of Physics, University of Vienna, VCQ & QuNaBioS, Boltzmanngasse 5, A‐1090 Vienna (Austria) |
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| Abstract: | We create and study trans‐Stilbene and Nile Red in a cryogenic (7 K) cell with a low density helium buffer gas. No molecule–helium cluster formation is observed, indicating limited atom–molecule sticking in this system. We place an upper limit of 5 % on the population of clustered He–trans‐Stilbene, consistent with a measured He–molecule collisional residence time of less than 1 μs. With its very low energy torsional modes, trans‐Stilbene is less rigid than any molecule previously buffer‐gas‐cooled into the Kelvin regime. We also report cooling and gas phase visible spectroscopy of Nile Red, a much larger molecule. Our data suggest that buffer gas cooling will be feasible for a variety of small biological molecules. |
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| Keywords: | buffer gas cooling dyes/pigments low‐temperature physics UV/Vis spectroscopy van der Waals clusters |
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