Variational equation of states of arbitrary angular momentum for two-particle systems

Metastable bound (1,3)D(o) states below N=3 ionization threshold of He+

The applicability of Ritz-variational principle for 3dnf ((1,3)D(o)) states lying between N=2 and N=3 ionization threshold of singly ionized helium is discussed in this communication. Probable existence of such a state for O(6+) within the planetary atmosphere in the polar regions of Jupiter is discussed.

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.

Variational calculation for the doubly excited state (2p2)3Pe of Be III

Nonrelativistic energy of the (2p(2))(3)P(e) state of Be(2+) has been calculated using Ritz-variational method. The trial wave function is of Hylleraas type. The upper-bound energy E=-3.382 712 420 77 a.u. calculated by us is the lowest yet obtained.