Journal
CHEMICAL PHYSICS LETTERS
Volume 404, Issue 4-6, Pages 389-393Publisher
ELSEVIER
DOI: 10.1016/j.cplett.2005.02.007
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Population relaxation of the O-H bending mode in pure liquid H2O is studied via nonlinear vibrational absorption in mid-infrared pump-probe experiments with a 100 fs time resolution. After resonant excitation of the v = 0 -> 1 bending transition, a v = 1 lifetime of 170 +/- 30 fs is measured. Such fast relaxation is due to anharmonic couplings to solvent modes. It is followed by slower spectral diffusion and energy redistribution processes within 1-2 ps. Femtosecond excitation also induces ultrafast nonlinear changes of the broad librational absorption occurring at frequencies below the v = 0 -> 1 bending transition. (c) 2005 Elsevier B.V. All rights reserved.
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