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Fakultät für Physik


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Impressum
(c) 2002 BMO

"Femtosecond photoisomerization of cis-azobenzene"
T. Nägele, R. Hoche, W. Zinth, J. Wachtveitl
Chem. Phys. Lett. 272 (1997) 489-495


Abstract:
Femtosecond transient absorption measurements of the photoisomerization ofazobenzene excited at 435 nm in the long wavelength (npi*) band are presented. Forcis-azobenzene the experiments reveal an extremely fast photoproduct formation witha dominating 170 fs and a weak 2 ps component. During the decay of the excited statesome oscillatory features are found. Vibrational cooling of the hot photoproducts in theground state occurs on a time scale of ten picoseconds. A slower initial photoreaction,which can be described by two time constants, 0.32 ps and 2.1 ps, is found for thetrans-isomer. The experimental results support the idea, that excitation of the S1 (npi*)bands of azobenzene leads to photoisomerization via inversion at one of the nitrogenatoms.

BMO authors (in alphabetic order):
Randolf Hoche
Thomas Nägele
Josef Wachtveitl
Wolfgang Zinth


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Letzte Änderung: 2016-09-14 13:34