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Radiative lifetimes...
Radiative lifetimes of metastable states of negative ions
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- Andersson, Pontus, 1971 (author)
- Gothenburg University,Göteborgs universitet,Institutionen för fysik (GU),Department of Physics (GU)
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- Fritioff, K. (author)
- Gothenburg University,Göteborgs universitet,Institutionen för fysik (GU),Department of Physics (GU)
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- Sandström, Joakim, 1968 (author)
- Gothenburg University,Göteborgs universitet,Institutionen för fysik (GU),Department of Physics (GU)
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Collins, G. (author)
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- Hanstorp, Dag, 1960 (author)
- Gothenburg University,Göteborgs universitet,Institutionen för fysik (GU),Department of Physics (GU)
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- Ellmann, A. (author)
- Stockholms universitet,Fysikum,atom
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- Schef, P. (author)
- Stockholms universitet,Fysikum,atom
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- Lundin, P. (author)
- Stockholms universitet,Fysikum,atom
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- Mannervik, S. (author)
- Stockholms universitet,Fysikum,atom
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- Royen, P. (author)
- Stockholms universitet,Fysikum,atom
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Fischer, F. K. C. (author)
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- Österdahl, Fabian (author)
- KTH,Fysik
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- Rostohar, D. (author)
- Stockholms universitet,Fysikum,atom
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Pegg, D. J. (author)
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Gibson, N. D. (author)
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- Danared, H. (author)
- Stockholms universitet,Manne Siegbahn-laboratoriet
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- Källberg, A. (author)
- Stockholms universitet,Manne Siegbahn-laboratoriet
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(creator_code:org_t)
- 2006
- 2006
- English.
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In: Physical Review A. Atomic, Molecular, and Optical Physics. - 1050-2947 .- 1094-1622 .- 2469-9926 .- 2469-9934. ; 73, s. 032705-
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Abstract
Subject headings
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- 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
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
Keyword
- Physics
- Fysik
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Andersson, Pontu ...
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Fritioff, K.
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Sandström, Joaki ...
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Collins, G.
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Hanstorp, Dag, 1 ...
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Ellmann, A.
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Schef, P.
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Lundin, P.
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Mannervik, S.
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Royen, P.
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Fischer, F. K. C ...
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Österdahl, Fabia ...
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Rostohar, D.
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Pegg, D. J.
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Gibson, N. D.
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Danared, H.
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Källberg, A.
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- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Atom and Molecul ...
- Articles in the publication
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Physical Review ...
- Physical Review ...
- By the university
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Royal Institute of Technology
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Chalmers University of Technology
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University of Gothenburg
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Stockholm University