Abstract
Photochemical isomerization in stilbene and diphenyl butadiene has been studied as a model for activated barrier crossing. Experiments have been carried out from isolated molecule conditions up to 3000 atm pressure in solution-phase samples. The qualitative features predicted by Kramers theory are observed. The system undergoes a transition from energy-controlled to diffusion-controlled behavior in the high-pressure gas phase. The influences of multidimensionality, intramolecular vibrational relaxation, and frequency dependent friction are discussed.
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Camille and Henry Dreyfus Teacher Scholar.
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Fleming, G.R., Courtney, S.H. & Balk, M.W. Activated barrier crossing: Comparison of experiment and theory. J Stat Phys 42, 83–104 (1986). https://doi.org/10.1007/BF01010842
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DOI: https://doi.org/10.1007/BF01010842