Low temperature scattering with the R-matrix method: argon-argon scattering

Abstract

Results for elastic atom-atom scattering are obtained as a first practical application of RmatReact, a new code for generating high-accuracy scattering observables from potential energy curves. RmatReact has been created in response to new experimental methods which have paved the way for the routine production of ultracold atoms and molecules, and hence the experimental study of chemical reactions involving only a small number of partial waves. Elastic scattering between argon atoms is studied here. There is an unresolved discrepancy between different argon-argon potential energy curves which give different numbers of vibrational bound states and different scattering lengths for the argon-argon dimer. Depending on the number of bound states, the scattering length is either large and positive or large and negative. Scattering observables, 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 scattering treatment yields resonances which are slightly lower in energy and narrower than previous determinations using the same potential energy curve.

26 pages, 9 figures, 3 tables

References in corpus (10)

• Creation of ultracold ${}^{87}$RbCs molecules in the rovibrational ground state
• Radio Frequency Association of Efimov Trimers
• Giant formation rates of ultracold molecules via Feshbach Optimized Photoassociation
• Limits on Universality in Ultracold Three-Boson Recombination
• Efimov Trimer Formation via Ultracold Four-body Recombination
• High accuracy calculations of the rotation-vibration spectrum of H${}_3^{+}$
• Low-temperature chemistry using the R-matrix method
• Trapping cold ground state argon atoms for sympathetic cooling of molecules
• Momentum space calculations of the binding energies of argon dimer
• Universal behaviour of diatomic halo states and the mass sensitivity of their properties