Quantum-reflection model for Penning ionization rate coefficients in cold collisions of metastable helium and rubidium

a S Dickinson (1)

1 School of Chemistry [Newcastle]

A quantum-reflection model is employed to calculate the rate coefficient for the Penning Ionization of Rubidium by cold metastable Helium atoms in unpolarized collisions. Various results for the p-wave transmission coefficient on a 1/R 6 long-range potential are discussed. The dispersion coefficient for the interaction of these atoms is estimated as 3540 atomic units. The calculated value of the rate coefficient is about four times lower than the recently measured value (Byron et al., Phys. Rev. A 81 01405 2010) for this process when both atoms are held in magnetooptical traps.

Mots clés: Physical Sciences

a S Dickinson. Quantum-reflection model for Penning ionization rate coefficients in cold collisions of metastable helium and rubidium. Journal of Physics B: Atomic, Molecular and Optical Physics, 2010, 43 (21), pp.215302. ⟨10.1088/0953-4075/43/21/215302⟩. ⟨hal-00569861⟩