Resonances in positronium-rubidium and positronium-cesium scattering

Details Resonances in positronium-rubidium and positronium-cesium scattering Resonances in positronium-rubidium and positronium-cesium scattering

2001-04-10

arxiv.org/abs/physics/0104037v1

Phys. Lett. A 283 (2001) 224-228

Physics

Chemical Physics

8 pages, 5 figures

Scientific paper

10.1016/S0375-9601(01)00237-7

Scattering of ortho positronium (Ps) by cesium and rubidium atoms has been investigated employing a three-Ps-state coupled-channel model with Ps(1s,2s,2p) states using a time-reversal-symmetric regularized electron-exchange model potential. We find a narrow S-wave singlet resonance at 5.057 eV of width 0.003 eV in the Ps-Rb system and at 5.067 eV of width 0.003 eV in the Ps-Cs system. Singlet P-wave resonances in both systems are found at 5.3 eV of width 0.4 eV. Singlet D-wave structures are found at 5.4 eV in both systems. The pronounced P- and D-wave resonances in these systems lead to easily detectable local minima in the low-energy elastic cross sections. We also report results for elastic and Ps-excitation cross sections for Ps scattering by Rb and Cs.

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