Violation of the exponential-decay law at long times

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

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.
• Public URL: https://durham-repository.worktribe.com/output/1536350