Resonant four-wave mixing spectra: A fresh look at photodissociation dynamics

Frequency- and polarization-resolved degenerate resonant four-wave mixing is used for the first time to study the rotational anisotropy of the OH radicals produced by photolysis of H2O2 by a plane-polarized laser radiation at 266 nm. For that, a flexible polarization setup is designed to directly is...

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Bibliographic Details
Published in:Journal of physics. Conference series 2014-11, Vol.548 (1), p.12016
Main Authors: Kouzov, A, Radi, P, Maksyutenko, P, Kozlov, D
Format: Article
Language:English
Subjects:
Angular momentum
Angular velocity
Anisotropy
Electric fields
Four-wave mixing
Helicity
Hydrogen peroxide
Photodissociation
Photolysis
Physics
Polarization
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Summary:Frequency- and polarization-resolved degenerate resonant four-wave mixing is used for the first time to study the rotational anisotropy of the OH radicals produced by photolysis of H2O2 by a plane-polarized laser radiation at 266 nm. For that, a flexible polarization setup is designed to directly isolate the rotationally anisotropic signals in the A2Σ+ – X2Π(0, 0) OH vibronic band. The results are quantitatively interpreted by using the line-space approach and accounting for all possible correlations between the electric field ED of the photolysis laser, the recoil velocity v and the angular momentum J of nascent particles. In so doing, the resonance amplitudes are decoupled into products of the polarization factors, the Doppler-broadened profiles and the Einstein B-coefficients. The anisotropic signals have characteristic shapes of well resolved Doppler doublets providing a direct evidence of translational helicity of the nascent OH radicals, a hitherto exprementally inaccessible key characteristic of the photodissociation path.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/548/1/012016