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The photo-induced trans–cis isomerization of the azobenzene derivative 4-nitro-4′-(dimethylamino)azobenzene in polar solution was studied by femtosecond UV/Vis and IR spectroscopy. The UV/Vis experiment reveals two excited state processes; the slower one (1ps) is the internal conversion to the ground state. The ensuing spectral changes point to vibrational cooling of the nascent cis product and the...
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