Cooling, Spectroscopy and Non-Sticking of trans-Stilbene and Nile Red

Author(s): J. Piskorski, D. Patterson, S. Eibenberger, J. M. Doyle

Volume: 15

Page(s): 3800-3804

Year: 2015

DOI Number: 10.1002/cphc.201402502

Link: Link to publication


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.

Note: Issue 17

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