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Femtosecond Studies of Isomerization and Energy Relaxation in Small Polyenes

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Abstract

Recent advances in laser technology have permitted the extension of femtosecond transient absorption studies into the deep ultraviolet. In the present investigation we have used tunable pump and probe pulses to study the photochemically initiated ring-opening reaction of 1,3-cyclohexadiene (CHD). A proper interpretation of the transient absorption signals obtained in the investigation of this ring-opening reaction requires an understanding of the vibrational and conformational relaxation processes which occur following formation of the hot cis-1,3,5-hexatriene photoproduct. To this end, we have also investigated the conformational and vibrational relaxation of hot cis-1,3,5-hexatriene and trans-1,3,5-hexatriene (HT) produced via ultrafast internal conversion following direct excitation of these two isomers.

© 1996 Optical Society of America

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