Accurate energies of nS, nP, nD, nF, and nG levels of neutral cesium.
Accurate energies of nS, nP, nD, nF, and nG levels of neutral cesium.
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DOI：
10.1103/physreva.35.4650
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发表时间：
1987-06
期刊：
影响因子：
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通讯作者：
K.-H. Weber;C. Sansonetti
中科院分区：
文献类型：
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作者：
K.-H. Weber;C. Sansonetti
用非共振和共振增强的无多普勒双光子光谱方法，广泛测量了Cs的n 2 S 1/2(n=8-31)，n 2 P 1/2(n=6，9-80)，n 2 D 5/2(n=5，7-36)，n 2 F 5/2(n=6-65)和n 2 G 7/2(n=6-54)能级的绝对能量.采用的激发机制包括共振增强的偶极-四极跃迁和四极-四极跃迁。所有能量都是相对于6 S 1/2 2基态直接测量的。用高精度的法布里-珀罗涉法测量了激光波长，对于大多数Cs能级，测量不确定度为0.0002厘米−1。用修正的里兹公式对观测到的五个系列进行拟合，得到的电离能在0.000 05 cm−1内重合。考虑到可能的系统误差，Cs的电离能为31 406.467 66(15)cm−1。
Extensive measurements have been performed to determine the absolute energies of the n 2 S 1/2 (n= 8–31), n 2 P 1/2 (n= 6, 9–80), n 2 D 5/2 (n= 5, 7–36), n 2 F 5/2 (n= 6–65), and n 2 G 7/2 (n= 6–54) levels of Cs by using nonresonant and resonantly enhanced Doppler-free two-photon spectroscopy. The excitation mechanisms employed include resonantly enhanced dipole-quadrupole and quadrupole-quadrupole transitions. All energies were measured directly with respect to the 6 S 1/2 2 ground state. The laser wavelengths were measured by high-precision Fabry-Perot interferometry yielding an uncertainty of 0.0002 cm− 1 for most Cs levels. Ionization energies derived by fitting the modified Ritz formula to each of the five series observed coincide within 0.000 05 cm− 1. Taking account of possible systematic errors, the Cs ionization energy is 31 406.467 66 (15) cm− 1.