Scattering of positronium from singly ionized helium and appearing resonances

Details Scattering of positronium from singly ionized helium and appearing resonances Scattering of positronium from singly ionized helium and appearing resonances

2001-06-13

arxiv.org/abs/physics/0106041v1

Physics

Atomic Physics

13 pages plus 4-figures

Scientific paper

The coupled-channel model [Phys. Rev. A {\bf 59}, 363 (1999)] that yields converged low-energy phase shifts, and exact binding and resonance features in Ps-H [Phys. Rev. A {\bf 59}, 2058 (1999)] is applied to study Ps-He$^+$ scattering. Similar to PsH, resonances appear in the S-, P-, D-, etc partial waves in the Ps-He$^+$ system but in both the singlet and triplet scattering channels. The latter signifies possible Rydberg states of $e^+$ around singlet and triplet helium. The S-wave singlet resonance at 2.79 eV agrees to that predicted earlier in $e^+$-He entrance channel (energy difference 16.64 eV) at 19.27 eV [Chem. Phys. Lett. {\bf 262}, 460 (1996)].

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