Abstract
Deep ultraviolet femtosecond transient absorption measurements of the photoisomerization reaction of 1,3-cyclohexadiene to form cis-1,3,5-hexatriene demonstrate that the rate of the photochemical ring-opening reaction is ⩾ 1 ps −1. The subsequent kinetics observed in picosecond resonance Raman and transient absorption measurements represents the time scales for vibrational and conformational relaxation of the photoproduct.
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