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Unnatural parity states of helium with screened Coulomb potentials
Author(s) -
Kar Sabyasachi,
Ho Y. K.
Publication year - 2008
Publication title -
international journal of quantum chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.484
H-Index - 105
eISSN - 1097-461X
pISSN - 0020-7608
DOI - 10.1002/qua.21661
Subject(s) - excited state , bound state , atomic physics , resonance (particle physics) , yukawa potential , helium atom , coulomb , wave function , atom (system on chip) , chemistry , helium , physics , quantum mechanics , electron , computer science , embedded system
Effect of screened Coulomb (Yukawa) potentials on the doubly excited meta‐stable bound states and the resonance states with unnatural parities of the helium atom have been investigated in the framework of stabilization method using CI‐type basis functions. A total of 54 resonances (6 each of 1 D o and 3 D o states, 12 each of 1 F e and 3 F e states, 9 each of 1 G o and 3 G o states) below the He + (3P) thresholds have been estimated by calculating the density of resonance states using a stabilization method. The resonances belong to the different 3lnl′ ( n ≥ 3) series. We have also calculated the doubly excited 1,3 F e and 1,3 G o meta‐stable bound states of He atom below the He + (2P) thresholds. The resonance energies and widths along with the meta‐stable bound states energies are reported for various screening parameters. In free atom case, some of the F‐wave resonance states and most of the cases, F‐ and G‐wave resonance widths are reported for the first time. © 2008 Wiley Periodicals, Inc. Int J Quantum Chem, 2008