Gas phase EPR linewidths and intermolecular potentials. III. Experimental results for the F–Ar, Cl–He, and Cl–Ar systems

Previous linewidth measurements on the gas phase EPR spectral lines of the F atom perturbed by He have been extended to include the collision pairs, F–Ar, Cl–He, and Cl–Ar. The new results share with the F–He data the feature that different Zeeman transitions in the 2P3/2 state have different broade...

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Bibliographic Details
Published in:The Journal of chemical physics 1975-04, Vol.62 (8), p.2952-2956
Main Authors: Zegarski, Bernard R., Cook, Thomas J., Miller, Terry A.
Format: Article
Language:English
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Summary:Previous linewidth measurements on the gas phase EPR spectral lines of the F atom perturbed by He have been extended to include the collision pairs, F–Ar, Cl–He, and Cl–Ar. The new results share with the F–He data the feature that different Zeeman transitions in the 2P3/2 state have different broadening cross sections. Also in all cases the 2P1/2 cross section is two or more orders of magnitude smaller than the 2P3/2 ones. Comparison of the 2P3/2 cross sections for the collision partners indicates that the angular symmetry of the intermolecular potential is the same for all. However, the lighter partners He and F have larger cross sections than are predicted by a simple dispersive force model. Evidence is presented which indicates that the 2P1/2 cross sections are dominated by nonadiabatic collisions, which connect the 2P1/2 and 2P3/2 levels.
ISSN:0021-9606
1089-7690
DOI:10.1063/1.430899