Violation of the exponential-decay law at long times

Rothe, C.; Hintschich, S.I.; Monkman, A.P.

doi:10.1103/physrevlett.96.163601

Violation of the exponential-decay law at long times

Rothe, C.; Hintschich, S.I.; Monkman, A.P.

Authors

C. Rothe

S.I. Hintschich

Professor Andrew Monkman a.p.monkman@durham.ac.uk
Professor

Abstract

First-principles quantum mechanical calculations show that the exponential-decay law for any metastable state is only an approximation and predict an asymptotically algebraic contribution to the decay for sufficiently long times. In this Letter, we measure the luminescence decays of many dissolved organic materials after pulsed laser excitation over more than 20 lifetimes and obtain the first experimental proof of the turnover into the nonexponential decay regime. As theoretically expected, the strength of the nonexponential contributions scales with the energetic width of the excited state density distribution whereas the slope indicates the broadening mechanism.

Citation

Rothe, C., Hintschich, S., & Monkman, A. (2006). Violation of the exponential-decay law at long times. Physical Review Letters, 96(16), https://doi.org/10.1103/physrevlett.96.163601

Journal Article Type	Article
Publication Date	Apr 1, 2006
Deposit Date	Sep 10, 2007
Publicly Available Date	Aug 2, 2010
Journal	Physical Review Letters
Print ISSN	0031-9007
Electronic ISSN	1079-7114
Publisher	American Physical Society
Peer Reviewed	Peer Reviewed
Volume	96
Issue	16
DOI	https://doi.org/10.1103/physrevlett.96.163601
Keywords	State, Polyfluorene, Dependence.