Differential steric effects in the inelastic scattering of NO(X) + Ar: Spin-orbit changing transitions

M. Brouard; S. D.S. Gordon; B. Nichols; V. Walpole; F. J. Aoiz; S. Stolte

doi:10.1039/c8cp06225k

Differential steric effects in the inelastic scattering of NO(X) + Ar: Spin-orbit changing transitions

M. Brouard^*, S. D.S. Gordon, B. Nichols, V. Walpole, F. J. Aoiz, S. Stolte

^*Corresponding author for this work

Research output: Contribution to Journal › Article › Academic › peer-review

Abstract

Spin-orbit changing transitions for bond-axis oriented collisions of NO(X) with Ar have been investigated with full quantum state selection via a crossed molecular beam experiment at collision energies of 532 cm^-1 and 651 cm^-1. NO(X) molecules were selected in their ground rotational state (Ω = 0.5, j = 0.5, f) before being adiabatically oriented using a static electric field, such that either the N- or O-end of the molecule was directed towards the incoming Ar atom. After collision, NO(X, Ω′ = 1.5, j′, e) molecules were probed quantum state specifically using velocity-map ion imaging, coupled with resonantly enhanced multi-photon ionization. Differences were observed between the experimental ion images and differential cross sections for collisions occurring at the two ends of the molecule, with results that could largely be accounted for by quantum mechanical scattering calculations. The bond-axis oriented data for the spin-orbit changing collisions are compared with similar results obtained previously for spin-orbit conserving transitions, and for field free scattering of NO(X) with Ar.

Original language	English
Pages (from-to)	14173-14185
Number of pages	13
Journal	Physical Chemistry Chemical Physics
Volume	21
Issue number	26
DOIs	https://doi.org/10.1039/c8cp06225k
Publication status	Published - 1 Jan 2019

Funding

The support of the UK EPSRC (to M. B. via Programme Grant EP/L005913/1). S. S. acknowledges support from the National Basic Research Program of China (973 program) under grant no. 2013CB922200, and from the National Science Foundation of China under grant No. 11034003 and 91221301. F. J. A. acknowledges the support of the Spanish Ministry of Economy and Innovation (Grant CTQ2015-65033-P MINECO-FEDER). S. D. S. G. and M. B. also thank Cambio Ltd and Dr Peter Dean for generous support, and Dr Cornelia Heid for critically reading the manuscript.

Funders	Funder number
Spanish Ministry of Economy and Innovation	CTQ2015-65033-P MINECO-FEDER
Engineering and Physical Sciences Research Council	EP/L005913/1
National Natural Science Foundation of China	91221301, 11034003
National Key Research and Development Program of China	2013CB922200

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title = "Differential steric effects in the inelastic scattering of NO(X) + Ar: Spin-orbit changing transitions",

abstract = "Spin-orbit changing transitions for bond-axis oriented collisions of NO(X) with Ar have been investigated with full quantum state selection via a crossed molecular beam experiment at collision energies of 532 cm-1 and 651 cm-1. NO(X) molecules were selected in their ground rotational state (Ω = 0.5, j = 0.5, f) before being adiabatically oriented using a static electric field, such that either the N- or O-end of the molecule was directed towards the incoming Ar atom. After collision, NO(X, Ω′ = 1.5, j′, e) molecules were probed quantum state specifically using velocity-map ion imaging, coupled with resonantly enhanced multi-photon ionization. Differences were observed between the experimental ion images and differential cross sections for collisions occurring at the two ends of the molecule, with results that could largely be accounted for by quantum mechanical scattering calculations. The bond-axis oriented data for the spin-orbit changing collisions are compared with similar results obtained previously for spin-orbit conserving transitions, and for field free scattering of NO(X) with Ar.",

author = "M. Brouard and Gordon, {S. D.S.} and B. Nichols and V. Walpole and Aoiz, {F. J.} and S. Stolte",

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doi = "10.1039/c8cp06225k",

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T2 - Spin-orbit changing transitions

AU - Brouard, M.

AU - Gordon, S. D.S.

AU - Nichols, B.

AU - Walpole, V.

AU - Aoiz, F. J.

AU - Stolte, S.

PY - 2019/1/1

Y1 - 2019/1/1

N2 - Spin-orbit changing transitions for bond-axis oriented collisions of NO(X) with Ar have been investigated with full quantum state selection via a crossed molecular beam experiment at collision energies of 532 cm-1 and 651 cm-1. NO(X) molecules were selected in their ground rotational state (Ω = 0.5, j = 0.5, f) before being adiabatically oriented using a static electric field, such that either the N- or O-end of the molecule was directed towards the incoming Ar atom. After collision, NO(X, Ω′ = 1.5, j′, e) molecules were probed quantum state specifically using velocity-map ion imaging, coupled with resonantly enhanced multi-photon ionization. Differences were observed between the experimental ion images and differential cross sections for collisions occurring at the two ends of the molecule, with results that could largely be accounted for by quantum mechanical scattering calculations. The bond-axis oriented data for the spin-orbit changing collisions are compared with similar results obtained previously for spin-orbit conserving transitions, and for field free scattering of NO(X) with Ar.

AB - Spin-orbit changing transitions for bond-axis oriented collisions of NO(X) with Ar have been investigated with full quantum state selection via a crossed molecular beam experiment at collision energies of 532 cm-1 and 651 cm-1. NO(X) molecules were selected in their ground rotational state (Ω = 0.5, j = 0.5, f) before being adiabatically oriented using a static electric field, such that either the N- or O-end of the molecule was directed towards the incoming Ar atom. After collision, NO(X, Ω′ = 1.5, j′, e) molecules were probed quantum state specifically using velocity-map ion imaging, coupled with resonantly enhanced multi-photon ionization. Differences were observed between the experimental ion images and differential cross sections for collisions occurring at the two ends of the molecule, with results that could largely be accounted for by quantum mechanical scattering calculations. The bond-axis oriented data for the spin-orbit changing collisions are compared with similar results obtained previously for spin-orbit conserving transitions, and for field free scattering of NO(X) with Ar.

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Differential steric effects in the inelastic scattering of NO(X) + Ar: Spin-orbit changing transitions

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