Vibronic interactions in NO3: from the 2E′ origin region to the NO + O2 reactive channel

Autor:	K. Mikhaylichenko, Curt Wittig, C. Riehn, L. Valachovic
Rok vydání:	1996
Předmět:	Coupling Quenching (fluorescence) Orders of magnitude (time) Chemistry General Physics and Astronomy Physical and Theoretical Chemistry Atomic physics Decomposition Fluorescence Atomic mass Spectral line Quantum tunnelling
Zdroj:	Chemical Physics Letters. 258:644-650
ISSN:	0009-2614
DOI:	10.1016/0009-2614(96)00703-8
Popis:	LIF spectra of expansion-cooled NO 3 in the region 595–666 nm reveal vibronic interactions responsible for 2 E′ radiationless decay. A hierarchy of coupling strengths is suggested. Due the large atomic masses, tunneling results in small unimolecular decomposition rates below the NO + O 2 barrier on the 2 A′ 2 ground potential surface. These have been observed via their quenching of long-lived NO 3 fluorescence, and rates as small as 3 × 10 4 s −1 are reported. This is 5 orders of magnitude smaller than the rate just above the barrier, which had been determined previously by using the ultrafast pump-probe technique.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::1e014457118a450d060592fcca4a39b0 https://doi.org/10.1016/0009-2614(96)00703-8 Zobrazit plný text záznamu Full Text from ScienceDirect