1.
J Chem Phys
; 126(1): 011104, 2007 Jan 07.
Article
in English
| MEDLINE
| ID: mdl-17212483
ABSTRACT
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.
2.
J Chem Phys
; 123(19): 196102, 2005 Nov 15.
Article
in English
| MEDLINE
| ID: mdl-16321117
ABSTRACT
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.