Doubly excited states of helium atoms between the N=2 and N=3 He+thresholds
- 14 September 1985
- journal article
- Published by IOP Publishing in Journal of Physics B: Atomic and Molecular Physics
- Vol. 18 (17) , 3481-3486
- https://doi.org/10.1088/0022-3700/18/17/010
Abstract
Some doubly excited autoionising states of helium atoms converging on the N=3 He+ threshold are calculated by use of a method of complex coordinates. Hylleraas-type wavefunctions are used for L=0 and L=1 resonances with products of Slater-orbital type wavefunctions with expansion lengths up to 319 terms for L>or=2 resonances. States of parities (-1)L and (-1)L+1 and with angular momenta of L<or=4 are calculated. Resonance energies and autoionisation widths are reported.Keywords
This publication has 18 references indexed in Scilit:
- High-resolution EUV satellite spectra of doubly excited He I (nln'l'), n=2 to 5Journal of Physics B: Atomic and Molecular Physics, 1984
- The method of complex coordinate rotation and its applications to atomic collision processesPhysics Reports, 1983
- Extraction of accurate autionisation widths from the emission spectrum of doubly-excited HeJournal of Physics B: Atomic and Molecular Physics, 1983
- P-wave doubly excited resonances in HeJournal of Physics B: Atomic and Molecular Physics, 1982
- Saddle-point technique for helium in the elastic- and inelastic-scattering energy regionPhysical Review A, 1980
- Autoionisation states of helium isoelectric sequence below the n=3 hydrogenic thresholdsJournal of Physics B: Atomic and Molecular Physics, 1979
- Two-electron excited states of heliumPhysics Letters A, 1978
- Comparison of doubly-excited helium energy levels, isoelectronic series, autoionization lifetimes, and group-theoretical configuration-mixing predictions with large-configuration-interaction calculations and experimental spectraPhysical Review A, 1975
- Projection-Operator Approximation for Autoionization States in the Inelastic Scattering RegionPhysical Review A, 1972
- The excitation of He+ by electron impactJournal of Physics B: Atomic and Molecular Physics, 1969