Laser-probing measurements and calculations of lifetimes of the 5d {sup 2}D{sub 3} at {sub {approx}}{sub sol{approx}} at {sub 2} and 5d {sup 2}D{sub 5} at {sub {approx}}{sub sol{approx}} at {sub 2} metastable levels in Ba II
Journal Article
·
· Physical Review. A
- Department of Physics, Stockholm University, AlbaNova University Center, SE-10691 Stockholm (Sweden)
- Service d'Astrophysique et de Spectroscopie Universite de Mons-Hainaut, 20 Place du Parc B-7000 Mons (Belgium)
- Institute of Solid State Physics, Bulgarian Academy of Sciences, 72 Tzarigradsko Chaussee, BG-1784 Sofia (Bulgaria)
- Department of Physics, Royal Institute of Technology, AlbaNova University Center, SE-10691 Stockholm (Sweden)
- Institut de Physique Nucleaire, Atomique et de Spectroscopie (IPNAS) Universite de Liege, Sart Tilman, Batiment B15 B-4000 Liege (Belgium)
The two metastable levels 5d {sup 2}D{sub 3} at {sub {approx}}{sub sol{approx}} at {sub 2} and 5d {sup 2}D{sub 5} at {sub {approx}}{sub sol{approx}} at {sub 2} in Ba II both show extremely long lifetimes of the order of several tens of seconds each. This has been found both by experiments and by theoretical predictions. The small transition probabilities associated with these two levels make them interesting and challenging for theoreticians as well as for experimentalists. Several calculations and measurements of these two lifetimes have been made previously but discrepancies between the results are present. This article presents values of {tau}=89.4{+-}15.6 s for the {sup 2}D{sub 3} at {sub {approx}}{sub sol{approx}} at {sub 2} level and {tau}=32.0{+-}4.6 s for the {sup 2}D{sub 5} at {sub {approx}}{sub sol{approx}} at {sub 2} level measured in a beam-laser experiment performed at the ion storage ring CRYRING. These values are supported by our new calculations resulting in {tau}=82.0 s for the {sup 2}D{sub 3} at {sub {approx}}{sub sol{approx}} at {sub 2} level and {tau}=31.6 s for the {sup 2}D{sub 5} at {sub {approx}}{sub sol{approx}} at {sub 2} level.
- OSTI ID:
- 20982514
- Journal Information:
- Physical Review. A, Journal Name: Physical Review. A Journal Issue: 5 Vol. 75; ISSN 1050-2947; ISSN PLRAAN
- Country of Publication:
- United States
- Language:
- English
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