Abstract
Recent measurements of isomerization rates of electronically excited trans-stilbene in supersonic beams and in thermal gases are analyzed in terms of the RRKM theory. It is shown that statistical unimolecular rate theory can quantitatively account for the experimental results. The absence of a major methyl-substitution effect is well reproduced. A comparison of isolated-molecule and liquid-phase isomerization rates indicates so far not understood solvent effects.
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