Radiative lifetimes of metastable states of negative ions

被引:12
作者
Andersson, P [1 ]
Fritioff, K
Sandström, J
Collins, G
Hanstorp, D
Ellmann, A
Schef, P
Lundin, P
Mannervik, S
Royen, P
Fischer, FKC
Osterdahl, F
Rostohar, D
Pegg, DJ
Gibson, ND
Danared, H
Källberg, A
机构
[1] Univ Gothenburg, Dept Phys, SE-41296 Gothenburg, Sweden
[2] Univ Stockholm, Dept Phys, SE-10691 Stockholm, Sweden
[3] Vanderbilt Univ, Dept Comp Sci, Nashville, TN 37235 USA
[4] Royal Inst Technol, Dept Phys, SE-10691 Stockholm, Sweden
[5] Inst Phys Nucl Atom & Spect, B-4000 Liege, Belgium
[6] Univ Tennessee, Dept Phys, Knoxville, TN 37996 USA
[7] Denison Univ, Dept Phys & Astron, Granville, OH 43023 USA
[8] Manne Siegbahn Lab, SE-10405 Stockholm, Sweden
来源
PHYSICAL REVIEW A | 2006年 / 73卷 / 03期
关键词
D O I
10.1103/PhysRevA.73.032705
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
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.
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页数:8
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