Transient absorption measurements on cis - and trans -azobenzene after UV excitation in the ππ* band are presented and compared to data obtained after VIS excitation in the nπ* band. The data show a two-step process, where after a fast motion on the S 2 potential energy surface the molecule relaxes to the S 1 state and in both cases ( trans → cis and cis → trans ) the isomerization reaction involves large-amplitude motion on the S 1 potential energy surface.
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Satzger et al. (2004) studied this question.
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