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Title: Multiple scattering mechanisms causing interference effects in the differential cross sections of H + D{sub 2} → HD(v′ = 4,  j′) + D at 3.26 eV collision energy

Abstract

Differential cross sections (DCSs) for the H + D{sub 2} → HD(v′ = 4,  j′) + D reaction at 3.26 eV collision energy have been measured using the photoloc technique, and the results have been compared with those from quantum and quasiclassical scattering calculations. The quantum mechanical DCSs are in good overall agreement with the experimental measurements. In common with previous results at 1.97 eV, clear interference patterns which appear as fingerlike structures have been found at 3.26 eV but in this case for vibrational states as high as v′ = 4. The oscillatory structure is prominent for low rotational states and progressively disappears as j′ increases. A detailed analysis, similar to that carried out at 1.97 eV, shows that the origin of these structures could be traced to interferences between well defined classical mechanisms. In addition, at this energy, we do not observe the anomalous positive j′–θ trend found for the v′ = 4 manifold at lower collision energies, thus reinforcing our explanation that the anomalous distribution for HD(v′ = 4,  j′) at 1.97 eV only takes place for those states associated with low product recoil energies.

Authors:
; ;  [1]; ; ;  [2]
  1. Department of Chemistry, Stanford University, Stanford, California 94305 (United States)
  2. Departamento de Quimica Fisica I, Facultad de Quimica, Universidad Complutense de Madrid, Madrid 28040 (Spain)
Publication Date:
OSTI Identifier:
22675970
Resource Type:
Journal Article
Journal Name:
Journal of Chemical Physics
Additional Journal Information:
Journal Volume: 145; Journal Issue: 2; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-9606
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; COLLISIONS; DIFFERENTIAL CROSS SECTIONS; EXPERIMENTAL DATA; MULTIPLE SCATTERING; QUANTUM MECHANICS; ROTATIONAL STATES; VIBRATIONAL STATES

Citation Formats

Sneha, Mahima, Gao, Hong, Zare, Richard N., E-mail: zare@stanford.edu, E-mail: aoiz@quim.ucm.es, Jambrina, P. G., Menéndez, M., and Aoiz, F. J., E-mail: zare@stanford.edu, E-mail: aoiz@quim.ucm.es. Multiple scattering mechanisms causing interference effects in the differential cross sections of H + D{sub 2} → HD(v′ = 4,  j′) + D at 3.26 eV collision energy. United States: N. p., 2016. Web. doi:10.1063/1.4955294.
Sneha, Mahima, Gao, Hong, Zare, Richard N., E-mail: zare@stanford.edu, E-mail: aoiz@quim.ucm.es, Jambrina, P. G., Menéndez, M., & Aoiz, F. J., E-mail: zare@stanford.edu, E-mail: aoiz@quim.ucm.es. Multiple scattering mechanisms causing interference effects in the differential cross sections of H + D{sub 2} → HD(v′ = 4,  j′) + D at 3.26 eV collision energy. United States. doi:10.1063/1.4955294.
Sneha, Mahima, Gao, Hong, Zare, Richard N., E-mail: zare@stanford.edu, E-mail: aoiz@quim.ucm.es, Jambrina, P. G., Menéndez, M., and Aoiz, F. J., E-mail: zare@stanford.edu, E-mail: aoiz@quim.ucm.es. Thu . "Multiple scattering mechanisms causing interference effects in the differential cross sections of H + D{sub 2} → HD(v′ = 4,  j′) + D at 3.26 eV collision energy". United States. doi:10.1063/1.4955294.
@article{osti_22675970,
title = {Multiple scattering mechanisms causing interference effects in the differential cross sections of H + D{sub 2} → HD(v′ = 4,  j′) + D at 3.26 eV collision energy},
author = {Sneha, Mahima and Gao, Hong and Zare, Richard N., E-mail: zare@stanford.edu, E-mail: aoiz@quim.ucm.es and Jambrina, P. G. and Menéndez, M. and Aoiz, F. J., E-mail: zare@stanford.edu, E-mail: aoiz@quim.ucm.es},
abstractNote = {Differential cross sections (DCSs) for the H + D{sub 2} → HD(v′ = 4,  j′) + D reaction at 3.26 eV collision energy have been measured using the photoloc technique, and the results have been compared with those from quantum and quasiclassical scattering calculations. The quantum mechanical DCSs are in good overall agreement with the experimental measurements. In common with previous results at 1.97 eV, clear interference patterns which appear as fingerlike structures have been found at 3.26 eV but in this case for vibrational states as high as v′ = 4. The oscillatory structure is prominent for low rotational states and progressively disappears as j′ increases. A detailed analysis, similar to that carried out at 1.97 eV, shows that the origin of these structures could be traced to interferences between well defined classical mechanisms. In addition, at this energy, we do not observe the anomalous positive j′–θ trend found for the v′ = 4 manifold at lower collision energies, thus reinforcing our explanation that the anomalous distribution for HD(v′ = 4,  j′) at 1.97 eV only takes place for those states associated with low product recoil energies.},
doi = {10.1063/1.4955294},
journal = {Journal of Chemical Physics},
issn = {0021-9606},
number = 2,
volume = 145,
place = {United States},
year = {2016},
month = {7}
}