Excited-level lifetimes and hyperfine-structure measurements on ions using collinear laser-ion-beam spectroscopy.
Excited-level lifetimes and hyperfine-structure measurements on ions using collinear laser-ion-beam spectroscopy.
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使用共线激光离子束光谱对离子进行激发能级寿命和超精细结构测量。
DOI：
10.1103/physreva.49.3463
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发表时间：
1994
期刊：
影响因子：
--
通讯作者：
Church
中科院分区：
文献类型：
--
作者：
Jin;Church
Ca II 4[ital p] [sup 2][ital P][sub 1/2]和4[ital p] [sup 2][ital P][sub 3/2]能级以及[sup 35]Cl II 4[ital p][prime] [sup 1][ital F][sub 3]能级的平均寿命[tau]，已通过以前应用于Ar II 4[ital p][prime] [sup 2][ital F][sub 7/2]的共线激光-离子束寿命技术的变体进行了测量。super [ital o]] level [Jian Jin and D. A. Church，Phys.Rev.A47，132（1993）]。[tau]（Ca II，4[italp] [sup 2][italP][sub 1/2]）=7.098（0.020）ns，[tau]（Ca II，4[italp] [sup 2][italP][sub 3/2]）=6.924（0.019）ns，[tau]（Cl II，4[italp][prime] [sup 1][italF][sub 3]）=11.17（0.06）ns。这些实验寿命，加上Ar II 4[ital p][总理] [sup 2][ital F][分7/2]水平，与最近可用的多电子计算进行比较。测量值与[italab] [italinitio]理论值之间的差异一般在1%-3%之间，而某些半经验计算值与实验值符合得更好。其他精确的碱金属系统的寿命测量数据进行了比较，最近的[ital ab] [ital initio]和半经验的计算提供的Ca II的结果的角度。在测量过程中还测量和分析了[sup 35]Cl II 3[ital d][prime] [sup 1][ital G][sub 4]-4 [ital p][prime] [sup 1][ital F][sub 3]跃迁的超精细结构，得到了超精细结构常数：[大写字母A]（[sup 1][ital F][sub 3]）=301.9（0.5）MHz，[大写B]（[sup 1][ital F][sub 3]）=[-]6.7（0.8）MHz，[ital A]（[sup 1][ital G][sub 4]）=205.1（0.5）MHz，[ital B]（[sup 1][ital G][sub 4]）=[-]3.9（2.4）MHz。«少
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] transitionmore » 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.« less