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Scattering of thermal He beams by crossed atomic and molecular beams. Ill. Anisotropic intermolecular potentials for He + N_2, O_2, CO, and NO

Keil, Mark and Slankas, John T. and Kuppermann, Aron (1979) Scattering of thermal He beams by crossed atomic and molecular beams. Ill. Anisotropic intermolecular potentials for He + N_2, O_2, CO, and NO. Journal of Chemical Physics, 70 (1). pp. 541-551. ISSN 0021-9606. http://resolver.caltech.edu/CaltechAUTHORS:20120726-082531174

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Abstract

Differential scattering cross sections are measured for He + N_2, O_2, CO, and NO, using the crossed molecular beams technique. These data, which are sensitive to the van der Waals attractive minima and adjacent regions of the intermolecular potentials, are analyzed in terms of both central‐field and anisotropic models. Little evidence is found for quenching of the observed diffraction oscillations, and anisotropic contributions are determined to be small: the spherical averages of these anisotropic potentials are indistinguishable, within experimental error, from the potentials obtained by a central‐field analysis. This study thus provides a quantitative, empirical validation of the central‐field assumption for molecular scattering in weakly anisotropic systems.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1063/1.437168DOIUNSPECIFIED
http://jcp.aip.org/resource/1/jcpsa6/v70/i1/p541_s1PublisherUNSPECIFIED
Additional Information:© 1979 American Institute of Physics. Received 2 May 1978. Online Publication Date: 28 July 2008. This work was supported in part by a Contract (EY-76-S-03-767) from the Department of Energy. Report Code: CALT-767P4-174. Work performed in partial fulfillment of the requirements for the Ph-D. degree in Chemistry at the California Institute of Technology. Contribution No, 5776. We wish to thank Dr. Gregory Parker for many useful discussions concerning the infinite-order sudden approximation, and for much help with its use. We also thank Ambassador College for generous use of its computing facilities.
Funders:
Funding AgencyGrant Number
Department of Energy (DOE)EY-76-S-03-767
Subject Keywords: HELIUM, ATOMIC BEAMS, MOLECOLAR BEAMS, VAN DER WAALS FORCES, NITROGEN, OXYGEN, CARBON MONOXIDE, NITROGEN OXIDES, DIFFERENTIAL CROSS SECTIONS, ATOM−MOLECULE COLLISIONS
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Caltech Arthur Amos Noyes Laboratory of Chemical Physics5776
Caltech Report CodeCALT-767P4-174
Classification Code:PACS: 34.50.Fa, 34.20.-b
Record Number:CaltechAUTHORS:20120726-082531174
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20120726-082531174
Official Citation: Scattering of thermal He beams by crossed atomic and molecular beams. III. Anisotropic intermolecular potentials for He + N2, O2, CO, and NO Mark Keil, John T. Slankas, and Aron Kuppermann J. Chem. Phys. 70, 541 (1979); http://dx.doi.org/10.1063/1.437168
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:32735
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:30 Jul 2012 16:21
Last Modified:26 Dec 2012 15:44

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