Abstract
Differential cross sections for elastic scattering of Na(3s) from Ar and Ne were measured with an angular resolution of 0.1° in a range of relative energies between 5 and 20×10−14 erg.
Excellent agreement is found between our experimental data for the Na-Ar system and calculated scattering patterns based on a model potential given by Düren et al. [3] with a well depth of ɛ=0.82×10−14 erg and an equilibrium distancer m =5.09×10−8 cm. The spectroscopically determined potential of Tellinghuisen et al. [9] is less suited to interpret our measurements; its repulsive branch has to be shifted to largerr-values by about 0.05×10−8cm.
By comparing our Na-Ne measurements with calculations based on model potential of Masnou-Seeuws et al. [7] and of Peach [6] we find that both potentials are too soft in their repulsive part. The best fits to our measurements are obtained with an empirical potential with ɛ=0.16×10−14 erg, as obtained from spectroscopic data,r m =5.35(5)×10−8cm and a repulsive part which is significantly steeper than obtained from model potential calculations.
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We thank Prof. R. Düren for valuable discussions regarding the interpretation of our data, P. Bijl and A. Heitzmann for assistance with the experiments and F.J. Bijvoet for the drawings. This work was performed as part of the research program of the “Stichting voor Fundamenteel Onderzoek der Materie”, which is financially supported by the “Nederlandse Organisatie voor Zuiver Wetenschappelijk Onderzoek (ZWO)”.
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van den Berg, F., Morgenstern, R., van der Valk, F. et al. Differential cross section measurements for Na-Ar and Na-Ne scattering: A test of interaction potentials. Z Physik A 312, 271–276 (1983). https://doi.org/10.1007/BF01414053
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DOI: https://doi.org/10.1007/BF01414053