Dynamics of the Reaction O(3P) + H2S → OH + SH. 2. State-Resolved Differential Cross Sections and Angular Momentum Correlations

Matthew L. Costen, Gus Hancock, Grant A. D. Ritchie

Research output: Contribution to journalArticle

Abstract

Measurements are reported of Doppler resolved polarized laser-induced fluorescence of the OH product of the O(3P) + H2S reaction, leading to estimates of the differential cross sections and angular momentum correlations in the system. O(3P) was produced with translational energy above the barrier to reaction by the polarized 355 nm photolysis of NO2. Three quantum states were studied in detail. For the most populated OH level, v″ = 1, N″ = 6, the scattering for the A″ A doublet was found to be largely sideways/backward, with the remaining energy appearing as product translation, and measurements of average A doublet scattering showed similar behavior for the A′ A doublet. The same scattering dynamics were observed for the v″ = 0, N″ = 13 state. For the rotationless v″ = 1, N″ = 1 state the results were more ambiguous, but if the same distribution of available energy appeared in the SH fragment as deduced for the measurements on rotationally excited OH, then the scattering was seen to be clearly backward. Polarization measurements of the two OH levels with N″ > 1 showed that the angular momentum vector J′ was directed perpendicular to the plane containing the relative velocity vectors of reactants and products. A model of the scattering is proposed through a planar transition state and is able to account qualitatively for these observations of the vector characteristics of the reaction, together with the scalar attributes (quantum state populations) reported in the previous paper. The model predicts that the SH coproduct will be scattered largely forward with respect to the O(3P) atom velocity, with low internal energy, and dominantly in the A″ A doublet.

Original languageEnglish
Pages (from-to)10651-10663
Number of pages13
JournalJournal of Physical Chemistry A
Volume103
Issue number49
DOIs
Publication statusPublished - 9 Dec 1999

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Angular momentum
angular momentum
Scattering
momentum
cross sections
scattering
products
Photolysis
internal energy
laser induced fluorescence
photolysis
energy
Fluorescence
fragments
Polarization
scalars
Atoms
Lasers
polarization
estimates

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

@article{673569a828ba4bf4b41089f7c76ae2d2,
title = "Dynamics of the Reaction O(3P) + H2S → OH + SH. 2. State-Resolved Differential Cross Sections and Angular Momentum Correlations",
abstract = "Measurements are reported of Doppler resolved polarized laser-induced fluorescence of the OH product of the O(3P) + H2S reaction, leading to estimates of the differential cross sections and angular momentum correlations in the system. O(3P) was produced with translational energy above the barrier to reaction by the polarized 355 nm photolysis of NO2. Three quantum states were studied in detail. For the most populated OH level, v″ = 1, N″ = 6, the scattering for the A″ A doublet was found to be largely sideways/backward, with the remaining energy appearing as product translation, and measurements of average A doublet scattering showed similar behavior for the A′ A doublet. The same scattering dynamics were observed for the v″ = 0, N″ = 13 state. For the rotationless v″ = 1, N″ = 1 state the results were more ambiguous, but if the same distribution of available energy appeared in the SH fragment as deduced for the measurements on rotationally excited OH, then the scattering was seen to be clearly backward. Polarization measurements of the two OH levels with N″ > 1 showed that the angular momentum vector J′ was directed perpendicular to the plane containing the relative velocity vectors of reactants and products. A model of the scattering is proposed through a planar transition state and is able to account qualitatively for these observations of the vector characteristics of the reaction, together with the scalar attributes (quantum state populations) reported in the previous paper. The model predicts that the SH coproduct will be scattered largely forward with respect to the O(3P) atom velocity, with low internal energy, and dominantly in the A″ A doublet.",
author = "Costen, {Matthew L.} and Gus Hancock and Ritchie, {Grant A. D.}",
year = "1999",
month = "12",
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volume = "103",
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journal = "Journal of Physical Chemistry A",
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Dynamics of the Reaction O(3P) + H2S → OH + SH. 2. State-Resolved Differential Cross Sections and Angular Momentum Correlations. / Costen, Matthew L.; Hancock, Gus; Ritchie, Grant A. D.

In: Journal of Physical Chemistry A, Vol. 103, No. 49, 09.12.1999, p. 10651-10663.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Dynamics of the Reaction O(3P) + H2S → OH + SH. 2. State-Resolved Differential Cross Sections and Angular Momentum Correlations

AU - Costen, Matthew L.

AU - Hancock, Gus

AU - Ritchie, Grant A. D.

PY - 1999/12/9

Y1 - 1999/12/9

N2 - Measurements are reported of Doppler resolved polarized laser-induced fluorescence of the OH product of the O(3P) + H2S reaction, leading to estimates of the differential cross sections and angular momentum correlations in the system. O(3P) was produced with translational energy above the barrier to reaction by the polarized 355 nm photolysis of NO2. Three quantum states were studied in detail. For the most populated OH level, v″ = 1, N″ = 6, the scattering for the A″ A doublet was found to be largely sideways/backward, with the remaining energy appearing as product translation, and measurements of average A doublet scattering showed similar behavior for the A′ A doublet. The same scattering dynamics were observed for the v″ = 0, N″ = 13 state. For the rotationless v″ = 1, N″ = 1 state the results were more ambiguous, but if the same distribution of available energy appeared in the SH fragment as deduced for the measurements on rotationally excited OH, then the scattering was seen to be clearly backward. Polarization measurements of the two OH levels with N″ > 1 showed that the angular momentum vector J′ was directed perpendicular to the plane containing the relative velocity vectors of reactants and products. A model of the scattering is proposed through a planar transition state and is able to account qualitatively for these observations of the vector characteristics of the reaction, together with the scalar attributes (quantum state populations) reported in the previous paper. The model predicts that the SH coproduct will be scattered largely forward with respect to the O(3P) atom velocity, with low internal energy, and dominantly in the A″ A doublet.

AB - Measurements are reported of Doppler resolved polarized laser-induced fluorescence of the OH product of the O(3P) + H2S reaction, leading to estimates of the differential cross sections and angular momentum correlations in the system. O(3P) was produced with translational energy above the barrier to reaction by the polarized 355 nm photolysis of NO2. Three quantum states were studied in detail. For the most populated OH level, v″ = 1, N″ = 6, the scattering for the A″ A doublet was found to be largely sideways/backward, with the remaining energy appearing as product translation, and measurements of average A doublet scattering showed similar behavior for the A′ A doublet. The same scattering dynamics were observed for the v″ = 0, N″ = 13 state. For the rotationless v″ = 1, N″ = 1 state the results were more ambiguous, but if the same distribution of available energy appeared in the SH fragment as deduced for the measurements on rotationally excited OH, then the scattering was seen to be clearly backward. Polarization measurements of the two OH levels with N″ > 1 showed that the angular momentum vector J′ was directed perpendicular to the plane containing the relative velocity vectors of reactants and products. A model of the scattering is proposed through a planar transition state and is able to account qualitatively for these observations of the vector characteristics of the reaction, together with the scalar attributes (quantum state populations) reported in the previous paper. The model predicts that the SH coproduct will be scattered largely forward with respect to the O(3P) atom velocity, with low internal energy, and dominantly in the A″ A doublet.

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SN - 1089-5639

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