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The following
projects are currently underway.
( I ) Studies of Atomic Resonance Phenomena
A method of complex-coordinate
rotation is applied to investigate resonances in electron-atom
scattering
and in photo-absorption experiments of atoms
and ions. The results will play an important role for investigating
symmetries of atomic Hamiltonians, correlation effects of
doubly excited electrons, and the underlying
mechanism of
autoionizations. Recent activities have focused on the following:
- Calculating Feshbach and shape resonances in e- - H
scattering;
- Investigating 1Po doubly excited states in He, with
and without the presence of an external electric
field. Our results are compared with experimental observations
using synchrotron light sources around the globe;
- Investigating the electric-field, magnetic-field, and
the combined field effects on the Feshbach and shape resonances
of H- ; and
- Calculating resonance states of many electron systems
such as Be, Mg, and their iso-electronic sequences.
( II ) Interactions of positrons and positronium with atoms
Recent activities have focused
on the following:
- Calculating the ground and resonance state energies
of positronium hydride (PsH);
- Investigating the doubly-excited states of positronium
negative ions; and
- Studing of resonance phenomena in positron-hydrogen
scattering and positronium-hydrogen scattering.
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