期刊
CHEMICAL PHYSICS LETTERS
卷 424, 期 1-3, 页码 66-70出版社
ELSEVIER
DOI: 10.1016/j.cplett.2006.04.051
关键词
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The femtosecond dynamics of O-H bending excitations are studied in pump-probe experiments at frequencies from 1000 to 3500 cm(-1). Upon resonant O-H bending excitation, one finds a v = 1 -> 2 absorption extending over similar to 200 cm(-1) and a v = 1 lifetime of 170 fs. O-H bending relaxation transfers excess energy to intermolecular modes, giving rise to a red-shifted librational absorption. Upon O-H stretching excitation, the O-H bending oscillator shows an instantaneous response due to a Fermi resonance between the v = 1 stretching and v = 2 bending states. The coupled states decay with a 200 fs lifetime via the O-H bending and librational modes. (c) 2006 Elsevier B.V. All rights reserved.
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