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  • Andersson, Pontus,1971Gothenburg University,Göteborgs universitet,Institutionen för fysik (GU),Department of Physics (GU) (author)

Radiative lifetimes of metastable states of negative ions

  • Article/chapterEnglish2006

Publisher, publication year, extent ...

  • 2006
  • printrdacarrier

Numbers

  • LIBRIS-ID:oai:DiVA.org:kth-37382
  • https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-37382URI
  • https://doi.org/10.1103/PhysRevA.73.032705DOI
  • https://research.chalmers.se/publication/57300URI
  • https://gup.ub.gu.se/publication/57300URI
  • https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-25166URI
  • https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-12530URI

Supplementary language notes

  • Language:English
  • Summary in:English

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Classification

  • Subject category:ref swepub-contenttype
  • Subject category:art swepub-publicationtype

Notes

  • We present a technique for measuring the radiative lifetimes of metastable states of negative ions that involves the use of a heavy-ion storage ring. The method has been applied to investigate the radiative decay of the np(3) P-2(1/2) levels of Te-(n=5) and Se-(n=4) and the 3p(3) D-2 state of Si- for which the J=3/2 and 5/2 levels were unresolved. All of these states are metastable and decay primarily by emission of E2 and M1 radiation. Multi Configuration Dirac-Hartree-Fock calculations of rates for the transitions in Te- and Se- yielded lifetimes of 0.45 s and 4.7 s, respectively. The measured values agree well with these predicted values. In the case of the D-2 state of Si-, however, our measurement was only able to set a lower limit on the lifetime. The upper limit of the lifetime that can be measured with our apparatus is set by how long the ions can be stored in the ring, a limit determined by the rate of collisional detachment. Our lower limit of 1 min for the lifetime of the D-2 state is consistent with both the calculated lifetimes of 162 s for the D-2(3/2) level and 27.3 h for the D-2(5/2) level reported by O'Malley and Beck and 14.5 h and 12.5 h, respectively, from our Breit-Pauli calculations.

Subject headings and genre

Added entries (persons, corporate bodies, meetings, titles ...)

  • Fritioff, K.Gothenburg University,Göteborgs universitet,Institutionen för fysik (GU),Department of Physics (GU) (author)
  • Sandström, Joakim,1968Gothenburg University,Göteborgs universitet,Institutionen för fysik (GU),Department of Physics (GU)(Swepub:cth)f3ajsm (author)
  • Collins, G. (author)
  • Hanstorp, Dag,1960Gothenburg University,Göteborgs universitet,Institutionen för fysik (GU),Department of Physics (GU)(Swepub:gu)xhanda (author)
  • Ellmann, A.Stockholms universitet,Fysikum,atom (author)
  • Schef, P.Stockholms universitet,Fysikum,atom (author)
  • Lundin, P.Stockholms universitet,Fysikum,atom (author)
  • Mannervik, S.Stockholms universitet,Fysikum,atom (author)
  • Royen, P.Stockholms universitet,Fysikum,atom (author)
  • Fischer, F. K. C. (author)
  • Österdahl, FabianKTH,Fysik(Swepub:kth)u1er6waw (author)
  • Rostohar, D.Stockholms universitet,Fysikum,atom (author)
  • Pegg, D. J. (author)
  • Gibson, N. D. (author)
  • Danared, H.Stockholms universitet,Manne Siegbahn-laboratoriet (author)
  • Källberg, A.Stockholms universitet,Manne Siegbahn-laboratoriet (author)
  • Göteborgs universitetInstitutionen för fysik (GU) (creator_code:org_t)

Related titles

  • In:Physical Review A. Atomic, Molecular, and Optical Physics73, s. 032705-1050-29471094-16222469-99262469-9934
  • In:Physical Review A73, s. 032705-

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