One photon two electron excitations between doubly excited states of helium.
Variational calculations using Hylleraas coordinates have been performed for the first time for estimating the energies of 3dnf((1,3)D(o)) state of helium for n=4,5,6. We predict absorption peaks at 12.219, 12.647, and 12.857 eV for the (3)D(o) series converging to N=3 ionization threshold of He(+) which can be expected to be observed in the experiment of single photon double excitation of lowest (3)P(e) state of helium placed in synchrotron radiation.
Bhattacharyya
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Kandi Raj College, Kandi, Murshidabad, West Bengal 742 137, India.
Sil
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Mukherjee
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TK
Mukherjee
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PK