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Proceedings Paper

Ultrafast radiationless relaxation in macrocarotenes and application of the energy gap law
Author(s): Per-Olof Andersson; Tomas Gillbro
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Paper 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 (kic), are interpreted together with the kic 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 kic 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.

Paper Details

Date Published: 17 June 1993
PDF: 9 pages
Proc. SPIE 1921, Laser Spectroscopy of Biomolecules, (17 June 1993); doi: 10.1117/12.146156
Show Author Affiliations
Per-Olof Andersson, Univ. of Umea (Sweden)
Tomas Gillbro, Univ. of Umea (Sweden)


Published in SPIE Proceedings Vol. 1921:
Laser Spectroscopy of Biomolecules

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