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Cooling, Spectroscopy and Non‐Sticking of trans ‐Stilbene and Nile Red
Author(s) -
Piskorski Julia,
Patterson David,
Eibenberger Sandra,
Doyle John M.
Publication year - 2014
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201402502
Subject(s) - buffer gas , chemistry , molecule , spectroscopy , nile red , helium , cluster (spacecraft) , population , atomic physics , chemical physics , analytical chemistry (journal) , physics , organic chemistry , optics , laser , demography , quantum mechanics , sociology , computer science , fluorescence , programming language
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.