Energies and widths of triply excited [ital n]=2 intrashell autoionizing states of He[sup [minus]]

Journal Article · Sun Jan 01 04:00:00 EST 1995 · Physical Review A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.51.204· OSTI ID:7061607

Bylicki, M; Nicolaides, C A ^[1]

---

1. Instytut Fizyki, Uniwersytet Mikolaja Kopernika, Grudziadzka 5, 87-100 Torun (Poland) Theoretical and Physical Chemistry Institute, National Hellenic Research Foundation, 48 Vasileos Constantinou Avenue, 11635 Athens (Greece)

We have computed to high accuracy the energies and the total widths of five triply excited [ital n]=2 intrashell resonances in He[sup [minus]], the 2[ital s][sup 2]2[ital p] [sup 2][ital P][sup [ital o]], 2[ital s]2[ital p][sup 2] [sup 2][ital D][sup [ital e]], [sup 4][ital P][sup [ital e]], [sup 2][ital P][sup [ital e]], and 2[ital p][sup 3] [sup 2][ital D][sup [ital o]]. These states are characterized by strong localized and asymptotic correlation effects and by their proximity to He doubly excited states. The possible many open channels correspond not only to one- but also to two-electron continua. The resonance parameters were established by applying the complex-coordinate rotation method with large basis sets of orbital and [ital r][sub [ital i][ital j]]-correlated configurations. The expansion length of the trial wave functions went up to 1300 terms for the 2[ital s]2[ital p][sup 2] [sup 2][ital D][sup [ital e]] resonance. This resonance is found to be below the He 2[ital s]2[ital p] [sup 3][ital P][sup [ital o]] threshold, in agreement with experimental observations and contrary to existing theoretical results. Similarly, the position of the 2[ital s]2[ital p][sup 2] [sup 2][ital P][sup [ital e]] resonance is also below the He 2[ital p][sup 2] [sup 3][ital P][sup [ital e]] threshold, in agreement with a recent theoretical prediction. The widths of these states range from 10 meV for the 2[ital s]2[ital p][sup 2] [sup 4][ital P][sup [ital e]] to 331 meV for 2[ital p][sup 3] [sup 2][ital D][sup [ital o]].

• OSTI ID: 7061607
• Journal Information: Physical Review A; (United States), Journal Name: Physical Review A; (United States) Vol. 51:1; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

664100* -- Theory of Electronic Structure of Atoms & Molecules-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
AUTOIONIZATION
CHARGED PARTICLES
CORRELATIONS
ELECTRON CORRELATION
ELECTRON-ELECTRON INTERACTIONS
ENERGY LEVELS
EXCITED STATES
FUNCTIONS
HELIUM IONS
INTERACTIONS
IONIZATION
IONS
LEPTON-LEPTON INTERACTIONS
PARTICLE INTERACTIONS
QUANTUM NUMBERS
WAVE FUNCTIONS