FIRST IONIZATION POTENTIALS OF LANTHANIDES BY LASER SPECTROSCOPY
FIRST IONIZATION POTENTIALS OF LANTHANIDES BY LASER SPECTROSCOPY
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DOI：
10.1364/josa.68.000052
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发表时间：
1978
影响因子：
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通讯作者：
E. Worden;R. Solarz;J. Paisner;J. Conway
中科院分区：
文献类型：
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作者：
E. Worden;R. Solarz;J. Paisner;J. Conway
使用逐步激光激发和电离方法研究了十种镧系元素的光电离和里德伯光谱。这些光谱是从每种情况下几种不同的激光填充激发态获得的。准确的电离限值源自观察到的光电离阈值。除镨外，对一个或多个长里德伯级数的观察可以确定更准确的限值。以 eV 为单位的里德伯收敛值为：Ce, 5.5387(4)；钕，5.5250(6)； SM，5.6437(6)；欧盟，5.6704(3)； GD，6.1502(6)； TB，5.8639(6)；镝，5.9390(6)；何，6.0216(6)，和尔 6.1077(10)。对于镨，获得的阈值为 5.464(+12-2)。当针对 N 绘制时，标准化的镧系元素电离极限对应于从 fNs2 最低水平到 fNs 最低水平的电离，形成在半填充壳层处连接的两条直线。
Photoionization and Rydberg spectra of ten lanthanides have been studied using stepwise laser excitation and ionization methods. These spectra were obtained from several different laser populated excited states in each case. Accurate ionization limits were derived from observed photoionization thresholds. Except for praseodymium, the observation of one or more long Rydberg progressions allowed more accurate limits to be determined. The Rydberg convergence values in eV are: Ce, 5.5387(4); Nd, 5.5250(6); Sm, 5.6437(6); Eu, 5.6704(3); Gd, 6.1502(6); Tb, 5.8639(6); Dy, 5.9390(6); Ho, 6.0216(6), and Er 6.1077(10). For praseodymium a threshold value of 5.464(+12-2) was obtained. When plotted against N, the lanthanide ionization limits normalized to correspond to ionization from the lowest level of fNs2 to the lowest level of fNs form two straight lines connected at the half-filled shell.