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In this work we present the first direct observation of a 220 cm -1 progression in the absorption spectrum of trans-azobenzene in the vapour phase. The mode at 220 cm -1 is essential to explain both the electronic absorption spectrum and the Raman excitation profiles of the most intense Raman bands of trans-azobenzene in the 1000-1600 cm -1 shift range. Our data...
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