Steric Effects in the Inelastic Scattering of NO(X) + Ar: Side-on Orientation.
The rotationally inelastic collisions of NO(X) with Ar, in which the NO bond-axis is oriented side-on (i.e. perpendicular) to the incoming collision partner, are investigated experimentally and theoretically. The NO(X) molecules are selected in the |j=0.5, Omega=0.5, epsilon=-1,f> state prior...
| Main Authors: | , , , , |
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| Format: | Journal article |
| Language: | English |
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American Chemical Society
2019
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| _version_ | 1826275703649206272 |
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| author | Walpole, V Heid, CG Jambrina, PG Aoiz, FJ Brouard, M |
| author_facet | Walpole, V Heid, CG Jambrina, PG Aoiz, FJ Brouard, M |
| author_sort | Walpole, V |
| collection | OXFORD |
| description | The rotationally inelastic collisions of NO(X) with Ar, in which the NO bond-axis is oriented side-on (i.e. perpendicular) to the incoming collision partner, are investigated experimentally and theoretically. The NO(X) molecules are selected in the |j=0.5, Omega=0.5, epsilon=-1,f> state prior to bond-axis orientation in a static electric field. The scattered NO products are then state selectively detected using velocity-map ion imaging. The experimental bond-axis orientation resolved differential cross sections and integral steric asymmetries are compared with quantum mechanical calculations, and are shown to be in good agreement. The strength of the orientation field is shown to affect the structure observed in the differential cross sections, and to some extent also the steric preference, depending on the ratio of the initial e and f Lambda-doublets in the superposition determined by the orientation field. Classical and quantum calculations are compared and used to rationalise the structures observed in the differential cross sections. It is found that these structures are due to quantum mechanical interference effects, which differ for the two possible orientations of the NO molecule due to the anisotropy of the potential energy surface probed in the side-on orientation. Side-on collisions are shown to maximise and afford a high degree of control over the scattering intensity at small scattering angles (theta<90 degrees), whilst end-on collisions are predicted to dominate in the backward scattered region (theta>90 degrees). |
| first_indexed | 2024-03-06T23:02:49Z |
| format | Journal article |
| id | oxford-uuid:62bdee0a-0ff9-4178-9c9a-5dee70decf35 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T23:02:49Z |
| publishDate | 2019 |
| publisher | American Chemical Society |
| record_format | dspace |
| spelling | oxford-uuid:62bdee0a-0ff9-4178-9c9a-5dee70decf352022-03-26T18:08:18ZSteric Effects in the Inelastic Scattering of NO(X) + Ar: Side-on Orientation.Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:62bdee0a-0ff9-4178-9c9a-5dee70decf35EnglishSymplectic Elements at OxfordAmerican Chemical Society2019Walpole, VHeid, CGJambrina, PGAoiz, FJBrouard, MThe rotationally inelastic collisions of NO(X) with Ar, in which the NO bond-axis is oriented side-on (i.e. perpendicular) to the incoming collision partner, are investigated experimentally and theoretically. The NO(X) molecules are selected in the |j=0.5, Omega=0.5, epsilon=-1,f> state prior to bond-axis orientation in a static electric field. The scattered NO products are then state selectively detected using velocity-map ion imaging. The experimental bond-axis orientation resolved differential cross sections and integral steric asymmetries are compared with quantum mechanical calculations, and are shown to be in good agreement. The strength of the orientation field is shown to affect the structure observed in the differential cross sections, and to some extent also the steric preference, depending on the ratio of the initial e and f Lambda-doublets in the superposition determined by the orientation field. Classical and quantum calculations are compared and used to rationalise the structures observed in the differential cross sections. It is found that these structures are due to quantum mechanical interference effects, which differ for the two possible orientations of the NO molecule due to the anisotropy of the potential energy surface probed in the side-on orientation. Side-on collisions are shown to maximise and afford a high degree of control over the scattering intensity at small scattering angles (theta<90 degrees), whilst end-on collisions are predicted to dominate in the backward scattered region (theta>90 degrees). |
| spellingShingle | Walpole, V Heid, CG Jambrina, PG Aoiz, FJ Brouard, M Steric Effects in the Inelastic Scattering of NO(X) + Ar: Side-on Orientation. |
| title | Steric Effects in the Inelastic Scattering of NO(X) + Ar: Side-on Orientation. |
| title_full | Steric Effects in the Inelastic Scattering of NO(X) + Ar: Side-on Orientation. |
| title_fullStr | Steric Effects in the Inelastic Scattering of NO(X) + Ar: Side-on Orientation. |
| title_full_unstemmed | Steric Effects in the Inelastic Scattering of NO(X) + Ar: Side-on Orientation. |
| title_short | Steric Effects in the Inelastic Scattering of NO(X) + Ar: Side-on Orientation. |
| title_sort | steric effects in the inelastic scattering of no x ar side on orientation |
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