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Title: Stimulated Raman excitation of the {ital ortho}-H{sub 2}{endash}OH entrance channel complex

Abstract

The fundamental H{sub 2} vibration of the {ital ortho}-H{sub 2}{endash}OH complex in its ground electronic state has been observed at 4151.49{plus_minus}0.03&hthinsp;cm{sup {minus}1} via stimulated Raman excitation. The stimulated Raman transition has been identified with an ultraviolet probe laser using two different detection schemes. The transition was detected as a depletion in the H{sub 2}{endash}OH laser-induced fluorescence signal in the OH A&hthinsp;{sup 2}{Sigma}{sup +}{endash}X&hthinsp;{sup 2}{Pi} (1,0) spectral region and through the appearance of OH A&hthinsp;{sup 2}{Sigma}{sup +}{endash}X&hthinsp;{sup 2}{Pi} (0,1) laser-induced fluorescence following vibrational predissociation of the complex. Vibrational predissociation is found to proceed via a near-resonant pathway that transfers one quantum of vibrational excitation from H{sub 2} to OH. The remaining {approximately}529 cm{sup {minus}1} of available energy is distributed over excited rotational states of OH (v=1) and the lowest rotational level of {ital ortho}-H{sub 2} (v=1), with the balance flowing into translational recoil. The lifetime of vibrationally activated {ital ortho}-H{sub 2}{endash}OH ({nu}{sub H{sub 2}}=1) is determined to be less than 7 ns, the temporal resolution of the lasers, by monitoring the time evolution of the OH products. The results are compared with previous infrared studies of OH vibrational activation in {ital ortho}-H{sub 2}{endash}OH as well as full collision studies of themore » reaction of vibrationally excited H{sub 2} with OH. {copyright} {ital 1999 American Institute of Physics.}« less

Authors:
; ; ;  [1]
  1. Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323 (United States)
Publication Date:
OSTI Identifier:
341163
Resource Type:
Journal Article
Journal Name:
Journal of Chemical Physics
Additional Journal Information:
Journal Volume: 110; Journal Issue: 14; Other Information: PBD: Apr 1999
Country of Publication:
United States
Language:
English
Subject:
66 PHYSICS; OXYGEN COMPOUNDS; FLUORESCENCE; PREDISSOCIATION; ROTATIONAL STATES; VIBRATIONAL STATES; HYDROGEN COMPLEXES; HYDROXYL RADICALS; RAMAN SPECTRA; STIMULATED EMISSION; EXCITATION; COMBUSTION

Citation Formats

Wheeler, M D, Todd, M W, Anderson, D T, and Lester, M I. Stimulated Raman excitation of the {ital ortho}-H{sub 2}{endash}OH entrance channel complex. United States: N. p., 1999. Web. doi:10.1063/1.478578.
Wheeler, M D, Todd, M W, Anderson, D T, & Lester, M I. Stimulated Raman excitation of the {ital ortho}-H{sub 2}{endash}OH entrance channel complex. United States. doi:10.1063/1.478578.
Wheeler, M D, Todd, M W, Anderson, D T, and Lester, M I. Thu . "Stimulated Raman excitation of the {ital ortho}-H{sub 2}{endash}OH entrance channel complex". United States. doi:10.1063/1.478578.
@article{osti_341163,
title = {Stimulated Raman excitation of the {ital ortho}-H{sub 2}{endash}OH entrance channel complex},
author = {Wheeler, M D and Todd, M W and Anderson, D T and Lester, M I},
abstractNote = {The fundamental H{sub 2} vibration of the {ital ortho}-H{sub 2}{endash}OH complex in its ground electronic state has been observed at 4151.49{plus_minus}0.03&hthinsp;cm{sup {minus}1} via stimulated Raman excitation. The stimulated Raman transition has been identified with an ultraviolet probe laser using two different detection schemes. The transition was detected as a depletion in the H{sub 2}{endash}OH laser-induced fluorescence signal in the OH A&hthinsp;{sup 2}{Sigma}{sup +}{endash}X&hthinsp;{sup 2}{Pi} (1,0) spectral region and through the appearance of OH A&hthinsp;{sup 2}{Sigma}{sup +}{endash}X&hthinsp;{sup 2}{Pi} (0,1) laser-induced fluorescence following vibrational predissociation of the complex. Vibrational predissociation is found to proceed via a near-resonant pathway that transfers one quantum of vibrational excitation from H{sub 2} to OH. The remaining {approximately}529 cm{sup {minus}1} of available energy is distributed over excited rotational states of OH (v=1) and the lowest rotational level of {ital ortho}-H{sub 2} (v=1), with the balance flowing into translational recoil. The lifetime of vibrationally activated {ital ortho}-H{sub 2}{endash}OH ({nu}{sub H{sub 2}}=1) is determined to be less than 7 ns, the temporal resolution of the lasers, by monitoring the time evolution of the OH products. The results are compared with previous infrared studies of OH vibrational activation in {ital ortho}-H{sub 2}{endash}OH as well as full collision studies of the reaction of vibrationally excited H{sub 2} with OH. {copyright} {ital 1999 American Institute of Physics.}},
doi = {10.1063/1.478578},
journal = {Journal of Chemical Physics},
number = 14,
volume = 110,
place = {United States},
year = {1999},
month = {4}
}