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Scattering of thermal He beams by crossed atomic and molecular beams. IV. Spherically symmetric intermolecular potentials for He+ CH_4, NH_3, H_2O, SF_6

Slankas, John T. and Keil, Mark and Kuppermann, Aron (1979) Scattering of thermal He beams by crossed atomic and molecular beams. IV. Spherically symmetric intermolecular potentials for He+ CH_4, NH_3, H_2O, SF_6. Journal of Chemical Physics, 70 (3). pp. 1482-1491. ISSN 0021-9606. http://resolver.caltech.edu/CaltechAUTHORS:20120727-084321227

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Abstract

Differential scattering cross sections are measured for He+CH_4, NH_3, H_2O, and SF_6, using the crossed molecular beams technique. These data, which are sensitive to the van der Waals attractive minima and adjacent regions of the intermolecular potential, are interpreted in terms of central‐field models. No evidence is found for quenching of the observed diffraction oscillations. The interactions of the isoelectronic hydrides CH_4, NH_3, H_2O with He are found to have decreasing van der Waals radii in this sequence, and their attractive wells all have similar depths. However, the He+SF_6 attractive well is found to be anomalously deep, and provides a counter example to the supposition that only the polarizability of the least polarizable of the interacting partners (atoms or molecules) correlates with the van der Waals well depth. Simple combination rules for predicting unlike‐pair potential parameters from the corresponding like‐pair ones are tested and found inadequate.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1063/1.437587 DOIUNSPECIFIED
http://jcp.aip.org/resource/1/jcpsa6/v70/i3/p1482_s1PublisherUNSPECIFIED
Additional Information:© 1979 American Institute of Physics. Received 6 June 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-767P4-175. Work performed in partial fulfillment of the requirements for the Ph.D. degree in Chemistry at the California Institute of Technology. Contribution No. 5798. We wish to 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: MOLECULAR BEAMS, HELIUM, METHANE, AMMONIA, WATER VAPOR, SULFUR FLUORIDES, INTERMOLECULAR FORCES, VAN DER WAALS FORCES, ATOM−MOLECULE COLLISIONS
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Caltech Arthur Amos Noyes Laboratory of Chemical Physics5798
Caltech Report CodeCALT-767P4-175
Classification Code:PACS: 34.20.-b, 34.50.Lf
Record Number:CaltechAUTHORS:20120727-084321227
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20120727-084321227
Official Citation: Scattering of thermal He beams by crossed atomic and molecular beams. IV. Spherically symmetric intermolecular potentials for He+CH4, NH3, H2O, SF6 John T. Slankas, Mark Keil, and Aron Kuppermann J. Chem. Phys. 70, 1482 (1979); http://dx.doi.org/10.1063/1.437587
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:32759
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:30 Jul 2012 15:46
Last Modified:26 Dec 2012 15:45

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