Absolute Total Scattering Cross Sections for ⁷Li on He, Ne, Kr, and Xe

Journal Article · Sat Jan 01 04:00:00 EST 1972 · The Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.1678154· OSTI ID:4616244

Dehmer, Patricia L.; Wharton, Lennard

Absolute total scattering cross sections were measured for the systems Li-He, Li-Ne, Li-Kr, and Li-Xe over a range of primary beam velocities of 0.75-4.75×10⁵ cm/sec corresponding to a range of kinetic energies of 0.04-0.33 eV for Li-He to 0.02-0.79 eV for Li-Xe. The standard deviations of the cross sections were less than 1.2% of the observed cross section and the maximum systematic errors were between -0.3% and +1.4%. The data were deconvoluted for the effect of target motion and were statistically smoothed. The smoothed data had a standard deviation of 0.2%-0.4% which was about 4 times smaller than the standard deviation of the raw data points and which provided a criterion for judging the adequacy of fits for various model potentials. Model potentials with up to 5 variable parameters were fit to the smoothed cross sections by a least squares method. For Li-Kr and Li-Xe 4 potential parameters were determined simultaneously. These experiments were most sensitive to the potential value over a range of limiting impact parameters. For Li-Kr and Li-Xe this range was 6.5-9.2 Å and 7.8-9.7 Å, respectively, and in this region the potential was determined to an accuracy of 3%-4%, with the error arising primarily from systematic errors in the measurement of the cross section.

• Research Organization: Univ. of Chicago, IL (United States). Dept. of Chemistry and James Franck Inst.
• Sponsoring Organization: US Atomic Energy Commission (AEC)
• NSA Number: NSA-27-010409
• OSTI ID: 4616244
• Journal Information: The Journal of Chemical Physics, Journal Name: The Journal of Chemical Physics Journal Issue: 11 Vol. 57; ISSN JCPSA6; ISSN 0021-9606
• Country of Publication: United States
• Language: English

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