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Autodetachment of the nsnp2 4P1/2 states in negative ions

Miecznik, G; Brage, Tomas LU and Fischer, CF (1992) In Journal of Physics B: Atomic, Molecular and Optical Physics 25(20). p.4217-4228
Abstract
The purpose of this work is to compute the autodetachment rates of the nsnp2 P-4(1/2) levels for Be-(2s2p2), Mg-(3s3p2) and Ca-(4s4p2) . Fano's configuration interaction model is implemented to compute the interaction between the discrete and continuum spaces of the wavefunction, which are determined using the multiconfiguration Hartree-Fock technique. Analysing the decay mechanism of the P-4(1/2) components, we find large cancellation effects in the transition matrix for the interaction between the discrete perturbers and the ns2ksS-2(1/2) continuum channels, which makes the calculations very sensitive to computational details. We predict relatively long-lived metastable states with lifetimes in the range 10(-5)-10(-7) s, which, however,... (More)
The purpose of this work is to compute the autodetachment rates of the nsnp2 P-4(1/2) levels for Be-(2s2p2), Mg-(3s3p2) and Ca-(4s4p2) . Fano's configuration interaction model is implemented to compute the interaction between the discrete and continuum spaces of the wavefunction, which are determined using the multiconfiguration Hartree-Fock technique. Analysing the decay mechanism of the P-4(1/2) components, we find large cancellation effects in the transition matrix for the interaction between the discrete perturbers and the ns2ksS-2(1/2) continuum channels, which makes the calculations very sensitive to computational details. We predict relatively long-lived metastable states with lifetimes in the range 10(-5)-10(-7) s, which, however, only for Be- remain in a qualitative agreement with the experiment. We also investigate the stability of the present approach in the light of the correlation in the discrete perturber and find a strong interplay between the representation of the ns2ks S-2(1/2) Continuum and the ns2n's S-2(1/2) Rydberg series. (Less)
Please use this url to cite or link to this publication:
author
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Physics B: Atomic, Molecular and Optical Physics
volume
25
issue
20
pages
4217 - 4228
publisher
IOP Publishing
external identifiers
  • wos:A1992JW74500017
  • scopus:4043169774
ISSN
0953-4075
DOI
10.1088/0953-4075/25/20/017
language
English
LU publication?
no
id
e193abb5-569c-49cf-b465-3ecc6266600c (old id 3919083)
date added to LUP
2013-07-08 15:39:20
date last changed
2017-04-02 03:58:45
@article{e193abb5-569c-49cf-b465-3ecc6266600c,
  abstract     = {The purpose of this work is to compute the autodetachment rates of the nsnp2 P-4(1/2) levels for Be-(2s2p2), Mg-(3s3p2) and Ca-(4s4p2) . Fano's configuration interaction model is implemented to compute the interaction between the discrete and continuum spaces of the wavefunction, which are determined using the multiconfiguration Hartree-Fock technique. Analysing the decay mechanism of the P-4(1/2) components, we find large cancellation effects in the transition matrix for the interaction between the discrete perturbers and the ns2ksS-2(1/2) continuum channels, which makes the calculations very sensitive to computational details. We predict relatively long-lived metastable states with lifetimes in the range 10(-5)-10(-7) s, which, however, only for Be- remain in a qualitative agreement with the experiment. We also investigate the stability of the present approach in the light of the correlation in the discrete perturber and find a strong interplay between the representation of the ns2ks S-2(1/2) Continuum and the ns2n's S-2(1/2) Rydberg series.},
  author       = {Miecznik, G and Brage, Tomas and Fischer, CF},
  issn         = {0953-4075},
  language     = {eng},
  number       = {20},
  pages        = {4217--4228},
  publisher    = {IOP Publishing},
  series       = {Journal of Physics B: Atomic, Molecular and Optical Physics},
  title        = {Autodetachment of the nsnp2 4P1/2 states in negative ions},
  url          = {http://dx.doi.org/10.1088/0953-4075/25/20/017},
  volume       = {25},
  year         = {1992},
}