期刊
CHEMPHYSCHEM
卷 15, 期 17, 页码 3800-3804出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cphc.201402502
关键词
buffer gas cooling; dyes; pigments; low-temperature physics; UV; Vis spectroscopy; van der Waals clusters
资金
- NSF
- DOE
- Austrian Science Fund (FWF) [W1210] Funding Source: Austrian Science Fund (FWF)
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 s. 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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