Two-photon spectroscopy of neutral barium: Observations of the highly excited even levels and theoretical analysis of the J = 0 spectrum
Two-photon spectroscopy of neutral barium: Observations of the highly excited even levels and theoretical analysis of the J = 0 spectrum
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DOI：
10.1103/physreva.18.2173
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发表时间：
1978-11
影响因子：
2.9
通讯作者：
M. Aymar;P. Camus;M. Dieulin;C. Morillon
中科院分区：
文献类型：
--
作者：
M. Aymar;P. Camus;M. Dieulin;C. Morillon
使用双光子吸收光谱、氮泵浦染料激光器和空间电荷检测，获得了有关中性钡偶校验 $J=0$ 和 $J=2$ 水平的大量新数据。里德伯系列的成员 $6sns^{1}S_{0}$ ($16l~nl~61$)、$6snd^{1}D_{2}$ ($15l~nl~81$) 和 $6snd^{3}D_{2}$ ($15l~nl~30$) 以及属于 $5d7d$ 配置的这些系列的扰动水平已被观察到；相应的波数已确定。详细描述了实验方法，随后介绍了新数据以及$J=0$谱的理论分析。 34370 ${\mathrm{cm}}^{\ensuremath{-}1}$ 和第一极限之间能量范围内的所有 $J=0$ 能级均通过多通道量子缺陷理论进行解释。在此能量范围内，$6sns^{1}S_{0}$系列受到38924和41441 ${\mathrm{cm}}^{\ensuremath{-}1}$两个能级的扰动；这些级别分别分配给 $5d6d^{1}S_{0}$ 和 $5d7d^{3}P_{0}$。
Extensive new data on the even parity $J=0$ and $J=2$ levels of neutral barium have been obtained using two-photon absorption spectroscopy with a nitrogen-pumped dye laser and space-charge detection. Members of the Rydberg series $6sns^{1}S_{0}$ ($16l~nl~61$), $6snd^{1}D_{2}$ ($15l~nl~81$), and $6snd^{3}D_{2}$ ($15l~nl~30$) and perturbing levels of these series belonging to the $5d7d$ configuration have been observed; the corresponding wave numbers have been determined. A detailed description of the experimental method is given, followed by the presentation of the new data and the theoretical analysis of the $J=0$ spectrum. All $J=0$ levels in the energy range between 34370 ${\mathrm{cm}}^{\ensuremath{-}1}$ and the first limit were interpreted by means of the multichannel quantumdefect theory. In this energy range, the $6sns^{1}S_{0}$ series is perturbed by two levels at 38924 and 41441 ${\mathrm{cm}}^{\ensuremath{-}1}$; these levels are assigned to $5d6d^{1}S_{0}$ and $5d7d^{3}P_{0}$, respectively.