DETECTION OF VIBRATIONAL-OVERTONE EXCITATION IN WATER VIA LASER-INDUCED GRATING SPECTROSCOPY

被引:32
作者
BUNTINE, MA
CHANDLER, DW
HAYDEN, CC
机构
[1] SANDIA NATL LABS,COMBUST RES FACIL,LIVERMORE,CA 94550
[2] STANFORD UNIV,DEPT CHEM,STANFORD,CA 94305
关键词
D O I
10.1063/1.468648
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
In this paper we describe a method, based on the laser-induced grating technique, for studying the spectroscopy of vibrational overtone-excited gas-phase water. Two phase-coherent visible laser beams whose frequencies are in the range of the third overtone of the OH stretch in water are crossed in the gas-phase sample. As the wavelength of these excitation beams is scanned through individual rovibrational OH overtone transitions, vibrational energy is deposited into the water in a spatially sinusoidal pattern. A fixed-frequency 266 nm probe laser beam is diffracted from the resultant transmission diffraction grating in water. We show that under collision-free conditions, probe laser diffraction is observed from the initially excited grating, which is a necessary condition for using this technique to study the absorption spectroscopy of the vibrationally excited molecules. Under multiple collision conditions, a probe laser wavelength-independent refractive index grating is formed within the bulk sample. In addition, we observe temporal oscillations in the grating diffraction efficiency arising from excitation of standing acoustic waves. ©1995 American Institute of Physics.
引用
收藏
页码:2718 / 2726
页数:9
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