Vibrational couplings and ultrafast relaxation of the O-H bending mode in liquid H2O
Vibrational couplings and ultrafast relaxation of the O-H bending mode in liquid H2O
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DOI：
10.1016/j.cplett.2006.04.051
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发表时间：
2006-06-12
影响因子：
2.8
通讯作者：
Elsaesser, T.
中科院分区：
文献类型：
--
作者：
Ashihara, S.;Huse, N.;Elsaesser, T.
在频率为1000 ~ 3500cm（-1）的泵浦探针实验中，研究了O-H弯曲激发的飞秒动力学。在谐振O-H弯曲激发下，人们发现v = 1 -> - 2吸收延伸到类似200 cm(-1), v = 1寿命为170 fs。O-H弯曲弛豫将多余的能量转移到分子间模式，引起红移振动吸收。在O-H拉伸激发下，由于v = 1拉伸态和v = 2弯曲态之间的费米共振，O-H弯曲振子表现出瞬时响应。耦合态通过O-H弯曲和振动模式衰减，寿命为200fs。(c) 2006 Elsevier B.V.版权所有
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.