Electronic relaxation dynamics of carbon cluster anions: Excitation of the C̃ 2Πg←X̃ 2Πu transition in C6−

Autor:	Daniel M. Neumark, Arthur E. Bragg, Christian Frischkorn, Roland Wester, Alison V. Davis
Rok vydání:	2001
Předmět:	X-ray photoelectron spectroscopy Chemistry Excited state General Physics and Astronomy Relaxation (physics) Physical and Theoretical Chemistry Atomic physics Internal conversion (chemistry) Ground state Excitation Molecular electronic transition Ion
Zdroj:	The Journal of Chemical Physics. 115:11185-11192
ISSN:	1089-7690 0021-9606
Popis:	Anion femtosecond photoelectron spectroscopy (FPES) has been used to monitor intramolecular electronic relaxation dynamics following the excitation of the C 2Πg←X 2Πu 000 electronic transition in C6−. The time-dependent photoelectron spectra provide a detailed picture of the relaxation dynamics in which the initially excited C 2Πg (v=0) level evolves into highly vibrationally excited C6− in its ground electronic state. The spectra show evidence for a two-step relaxation mechanism: internal conversion (IC) to vibrationally excited B 2Σu+ and A 2Σg+ states, occurring on a time scale of 730±50 fs, followed by IC from these intermediate states to highly vibrationally excited levels in the X 2Πu ground state with a time constant of 3.0±0.1 ps.
Databáze:	OpenAIRE
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