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Coherent laser spectroscopy of molecular motions in liquids in the maser range
Author(s) -
Bunkin A. F.,
Pershin S. M.,
Nurmatov A. A.,
Gorchakov A. P.
Publication year - 2007
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.1678
Subject(s) - molecule , chemistry , spectroscopy , aqueous solution , rotational spectroscopy , analytical chemistry (journal) , rotational correlation time , spectral line , raman spectroscopy , intramolecular force , nuclear magnetic resonance , molecular physics , stereochemistry , physics , organic chemistry , optics , quantum mechanics , astronomy
The terahertz and subterahertz four‐photon spectroscopy of liquids gives the opportunity to study large volume samples in native conditions. We present the experimental measurements by this technique of the low‐wavenumber molecular motion in water and some aqueous solution. In fact, the coherent librations of H 2 O molecules in liquid water as well as aqueous solutions of H 2 O 2 and a protein in the microwave range (0.1–100 cm −1 ) are observed. A satisfactory correlation of the observed resonances with the rotational spectra of H 2 O molecule in the gas phase is found. Moreover the lines of ortho ‐ and para ‐isomers of H 2 O molecule were identified. We have found that the protein molecules in water interact selectively with the spin isomers of H 2 O. There is a strong suppression of the rotational motion of the para ‐isomers and their respective line intensities, with a corresponding magnification by a factor of 8 by the ortho species. Copyright © 2007 John Wiley & Sons, Ltd.