Positron attachment to the He doubly excited states

Details Positron attachment to the He doubly excited states Positron attachment to the He doubly excited states

2012-02-21

arxiv.org/abs/1202.4522v1

Physics

Atomic Physics

4 pages, 1 figure

Scientific paper

The projection method is used to demonstrate the existence of positron attachment to three doubly excited states of helium. The e+He(2s2 1Se), e+He(3s2 1Se), and the e+He(2s2p 3Po) states have binding energies of 0.447 eV, 0.256 eV and 0.486 eV respectively. These energies were computed with the stochastic variational method and the configuration interaction method. These states will exist as resonances in the e+ - He continuum and the e+He(2s2 1Se) state could be detectable in the e+ + He collision spectrum. The existence of a series of e+ He(ns2 1Se) resonances associated with the He(ns2) double Rydberg series is also predicted and an explicit calculation demonstrating the existence of the e+He(3s2 1Se) state is reported.

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