Ultrafast radiationless relaxation in macrocarotenes and application of the energy gap law

Per-Olof Andersson; Tomas Gillbro

doi:10.1117/12.146156

17 June 1993 Ultrafast radiationless relaxation in macrocarotenes and application of the energy gap law

Per-Olof Andersson, Tomas Gillbro

Proceedings Volume 1921, Laser Spectroscopy of Biomolecules; (1993) https://doi.org/10.1117/12.146156
Event: Laser Spectroscopy of Biomolecules: 4th International Conference on Laser Applications in Life Sciences, 1992, Jyvaskyla, Finland

Abstract

By femtosecond ground-state recovery measurements the lifetime of the lowest excited singlet (S₁) state in extra long carotenes, with 15 and 19 conjugated double bonds, has been determined to 850 and 470 fs, respectively. The nonradiative relaxation rates, due to internal conversion (k_ic), are interpreted together with the k_ic found for shorter carotenes homologous to trans-(beta) -carotene with 5, 7 and 11 ((beta) -carotene) conjugated double bonds. By using the energy gap law derived in the weak coupling limit the radiationless transitions were analyzed. The variations of k_ic depend mainly on the large variations in the coupling parameter, and the negative exponential energy gap dependence plays a minor role, due to the low value on the (gamma) parameter.

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Per-Olof Andersson and Tomas Gillbro "Ultrafast radiationless relaxation in macrocarotenes and application of the energy gap law", Proc. SPIE 1921, Laser Spectroscopy of Biomolecules, (17 June 1993); https://doi.org/10.1117/12.146156

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