Abstract
Vibrational overtone predissociation spectroscopy, which detects the products of a unimolecular reaction initiated by overtone vibration excitation as a function of wavelength, is an informative means of studying highly vibrationally excited molecules. The spectrum, obtained by varying the excitation laser wavelength while keeping the probe laser tuned to interrogate a single product state, mirrors the overtone vibration absorption spectrum of those molecules that decompose into the detected quantum state. Using this technique to detect individual rotational states of the OH fragments from hydrogen peroxide excited in the regions of the third to the fifth OH stretching overtone (4νOH, 5νOH, 6νOH) reveals coarse and fine vibrational structure in the spectrum. A vibration-torsion model, in which the high frequency OH stretching vibration and the low frequency torsional vibration are separated adiabatically, recovers the observed transition wave numbers and intensities and predicts previously unobserved transitions. Because the measurements probe individual product quantum states, the excitation spectrum also depends on the partitioning of the products among their states. This appears as a variation in the intensity of different transitions with the product state that is probed, and a statistical model of the unimolecular decomposition in combination with the vibration-torsion model of the absorption spectrum explains the dependence of the overtone vibrational predissociation spectra on the probed rotational state of the OH product.
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Dates
Type | When |
---|---|
Created | 23 years, 1 month ago (July 26, 2002, 9 a.m.) |
Deposited | 1 year, 6 months ago (Feb. 9, 2024, 10:53 p.m.) |
Indexed | 4 months, 1 week ago (April 21, 2025, 4:44 p.m.) |
Issued | 39 years, 10 months ago (Oct. 15, 1985) |
Published | 39 years, 10 months ago (Oct. 15, 1985) |
Published Print | 39 years, 10 months ago (Oct. 15, 1985) |
@article{D_bal_1985, title={Vibrational overtone predissociation spectroscopy of hydrogen peroxide}, volume={83}, ISSN={1089-7690}, url={http://dx.doi.org/10.1063/1.449097}, DOI={10.1063/1.449097}, number={8}, journal={The Journal of Chemical Physics}, publisher={AIP Publishing}, author={Dübal, H.-R. and Crim, F. F.}, year={1985}, month=oct, pages={3863–3872} }