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Updated: Jan 19, 2026

Cooling Rate Dependent Ellipsometry Measurements to Determine the Dynamics of Thin Glassy Films
Published on: January 26, 2016
Translational Diffusion and Unstable Conformer Trapping in Glassy Isopentane at 77 K
László Zimányi1, Sumesh B Krishnan2, Emily Williford2
1Institute of Biophysics , Biological Research Centre, Hungarian Academy of Sciences , P.O. Box 521, Szeged , Hungary , H-6701.
Abstract:
Diffusional quenching in isopentane (IP) glass at 77 K is demonstrated by the reduction of triphenylene phosphorescence lifetimes in the presence of 1,3-pentadiene and/or molecular oxygen. Fluorescence spectra and lifetimes of cis- and trans-1,2-di(1-methyl-2-naphthyl)ethene in IP glass at 77 K reveal that the cis → trans photoisomerization leads to the trapping of unstable conformers of the trans isomer. The claim that IP at 77 K is not sufficiently viscous to trap unstable photoproduct conformers is invalidated.
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