Low temperature scattering with the R-matrix method: argon-argon scattering.
2019
Results for elastic atom-atom
scatteringare obtained as a first practical application of RmatReact, a new code for generating high-accuracy
scatteringobservables from
potential energycurves. RmatReact has been created in response to new experimental methods which have paved the way for the routine production of
ultracold atomsand molecules, and hence the experimental study of chemical reactions involving only a small number of partial waves. Elastic
scatteringbetween
argonatoms is studied here. There is an unresolved discrepancy between different
argon-argon
potential energycurves which give different numbers of vibrational
bound statesand different
scattering lengthsfor the
argon-argondimer. Depending on the number of
bound states, the
scattering lengthis either large and positive or large and negative.
Scatteringobservables, specifically the
scattering length, effective range, and partial and total cross-sections, are computed at low collision energies and compared to previous results. In general, good agreement is obtained, although our full
scatteringtreatment yields resonances which are slightly lower in energy and narrower than previous determinations using the same
potential energycurve.
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