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Characteristic wavenumber shifts of the stimulated Raman scattering from interfacial water molecules induced by laser‐induced plasma generation at air–water and water–silver interfaces
Author(s) -
Yui Hiroharu,
Kato Hisaya,
Someya Yuu
Publication year - 2008
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.2085
Subject(s) - wavenumber , raman scattering , raman spectroscopy , chemistry , brillouin scattering , plasma , molecular physics , molecule , spectral line , laser , analytical chemistry (journal) , atomic physics , materials science , optics , organic chemistry , physics , quantum mechanics , astronomy
Stimulated Raman scattering (SRS) from water molecules in the air–water and water–silver interfacial regions is measured when laser‐induced plasma are generated at these interfaces. In both cases, characteristic lower wavenumber shifts of the OH stretching vibrational modes of the interfacial water molecules are observed. The mechanisms of the characteristic lower wavenumber shifts are considered from two viewpoints. One is the electrostatic interactions between the interfacial water molecules and the excess electrons induced by the plasma generation at the interfacial area. The other is the coupling of the SRS with Brillouin scattering induced by a shock wave generation by abrupt volume expansion due to the phase transition from liquid to plasma. Differences between the obtained SRS spectra and vibrational spectra previously measured by a sum‐frequency generation technique are also discussed. Copyright © 2008 John Wiley & Sons, Ltd.