Excited-level lifetimes and hyperfine-structure measurements on ions using collinear laser--ion-beam spectroscopy

Journal Article · Sun May 01 04:00:00 EDT 1994 · Physical Review A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.49.3463· OSTI ID:5008463

Jin, J; Church, D A ^[1]

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1. Physics Department, Texas A M University, College Station, Texas 77843 (United States)

The mean lifetimes [tau] of the Ca II 4[ital p] [sup 2][ital P][sub 1/2] and 4[ital p] [sup 2][ital P][sub 3/2] levels, and the [sup 35]Cl II 4[ital p][prime] [sup 1][ital F][sub 3] level, have been measured by a variant of the collinear laser--ion-beam lifetime technique applied previously to the Ar II 4[ital p][prime] [sup 2][ital F][sub 7/2][sup [ital o]] level [Jian Jin and D. A. Church, Phys. Rev. A 47, 132 (1993)]. The present results are [tau](Ca II, 4[ital p] [sup 2][ital P][sub 1/2])=7.098(0.020) ns, [tau](Ca II, 4[ital p] [sup 2][ital P][sub 3/2])=6.924(0.019) ns, and [tau](Cl II, 4[ital p][prime] [sup 1][ital F][sub 3]) =11.17(0.06) ns. The experimental lifetimes of these, plus the Ar II 4[ital p][prime] [sup 2][ital F][sub 7/2] level, are compared with available recent many-electron calculations. Typically 1%--3% differences between measurement and [ital ab] [ital initio] theory are found, while certain semiempirical calculations are in better agreement with experiment. Data for other precise lifetime measurements on alkali-metal systems are compared with recent [ital ab] [ital initio] and semiempirical calculations to provide perspective on the Ca II results. The hyperfine structure of the [sup 35]Cl II 3[ital d][prime] [sup 1][ital G][sub 4]--4[ital p][prime] [sup 1][ital F][sub 3] transition was also measured and analyzed in the course of the measurements, with the resulting hyperfine-structure constants: [ital A]([sup 1][ital F][sub 3])=301.9(0.5) MHz, [ital B]([sup 1][ital F][sub 3])=[minus]6.7(0.8) MHz, [ital A]([sup 1][ital G][sub 4])=205.1(0.5) MHz, and [ital B]([sup 1][ital G][sub 4])=[minus]3.9(2.4) MHz.

• OSTI ID: 5008463
• Journal Information: Physical Review A; (United States), Journal Name: Physical Review A; (United States) Vol. 49:5; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

664200* -- Spectra of Atoms & Molecules & their Interactions with Photons-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
BEAM DYNAMICS
BEAM-BEAM INTERACTIONS
CALCIUM IONS
CHARGED PARTICLES
CHLORINE IONS
HYPERFINE STRUCTURE
IONS
LASER SPECTROSCOPY
LIFETIME
SPECTROSCOPY