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Energy Transfer in Single Hydrogen‐Bonded Water Molecules
Author(s) -
Bakker Huib J.,
Gilijamse Joop J.,
Lock Anjan J.
Publication year - 2005
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.200400606
Subject(s) - molecule , hydrogen bond , chemistry , infrared spectroscopy , spectroscopy , hydrogen , infrared , photochemistry , femtosecond , raman spectroscopy , analytical chemistry (journal) , laser , organic chemistry , physics , quantum mechanics , optics
We study the structure and dynamics of hydrogen‐bonded complexes of H 2 O/HDO and acetone dissolved in carbon tetrachloride by probing the response of the OH stretching vibrations with linear mid‐infrared spectroscopy and femtosecond mid‐infrared pump–probe spectroscopy. We find that the hydrogen bonds in these complexes break and reform with a characteristic time scale of ≈1 ps. These hydrogen‐bond dynamics are observed to play an important role in the equilibration of vibrational energy over the two OH groups of the H 2 O molecule. For both H 2 O and HDO, the OH stretching vibrational excitation relaxes with a time constant of 6.3±0.3 ps, and the molecular reorientation has a time constant of 6±1 ps.