Ultrafast excited state relaxation in long-chain polyenes

Autor:	Ronald L. Christensen, Dario Polli, Larry Lüer, Maria Rosa Antognazza, Richard R. Schrock, Giulio Cerullo, Guglielmo Lanzani
Rok vydání:	2010
Předmět:	education.field_of_study Chemistry Relaxation (NMR) Population General Physics and Astronomy Excited state Femtosecond Singlet fission Stimulated emission Physical and Theoretical Chemistry Triplet state Atomic physics education Excitation
Zdroj:	Repositorio Institucional del Instituto Madrileño de Estudios Avanzados en Nanociencia instname
ISSN:	0301-0104
Popis:	We present a comprehensive study, by femtosecond pump–probe spectroscopy, of excited state dynamics in a polyene that approaches the infinite chain limit. By excitation with sub-10-fs pulses resonant with the 0–0 S 0 → S 2 transition, we observe rapid loss of stimulated emission from the bright excited state S 2 , followed by population of the hot S 1 state within 150 fs. Vibrational cooling of S 1 takes place within 500 fs and is followed by decay back to S 0 with 1 ps time constant. By excitation with excess vibrational energy we also observe the ultrafast formation of a long-living absorption, that is assigned to the triplet state generated by singlet fission.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::099bce0490846f8398780ded88b0fd6d https://doi.org/10.1016/j.chemphys.2010.03.002 Zobrazit plný text záznamu Full Text from ScienceDirect