The First Ionization Potentials of Samarium, Europium, Gadolinium, Dysprosium, Holmium, Erbium, Thulium, and Ytterbium by the Electron-Impact Method
The First Ionization Potentials of Samarium, Europium, Gadolinium, Dysprosium, Holmium, Erbium, Thulium, and Ytterbium by the Electron-Impact Method
复制标题
DOI：
10.1021/j100881a508
复制
发表时间：
1966-09
期刊：
影响因子：
--
通讯作者：
K. Zmbov;J. Margrave
中科院分区：
文献类型：
--
作者：
K. Zmbov;J. Margrave
图2. Dy+、Ho+和Er+离子的电离效率曲线。法实验用先前描述的磁质谱仪进行。1稀土原子的光谱是复杂的，不能完全解释。2气态稀土原子是在钽努森电解池中加热金属或在同一电解池中用Gd或Ho还原各种三氟化合物和CaF_2而产生的。作为一个典型的例子，Sm+的电离效率曲线与图1中背景Hg+离子的电离效率曲线（曲线Ⅰ）或与图1中CaF_2还原Ca+离子的电离效率曲线（曲线Ⅱ）进行了比较。采用半对数匹配法，3 4测量稀土离子电离效率曲线的初始部分与参比离子电离效率曲线相匹配所需的电压漂移。用已知的Hg（10.43 ev）2，4和Ca（6.11 ev）2· 5的电离势，得到Sm的电离势为5.56±0.10 ev。相比之
Figure 2. Ionization efficiency curves for Dy+, Ho+, and Er+ ions. method. The experiments were carried out with a magnetic mass spectrometer described previously. 1 Optical spectra of rare earth atoms are complex and incompletely interpreted. 2 Gaseous rare earth atoms were produced either by heating the metal in a tantalum Knudsen cell or by re-duction of the various trifluorides and CaF2 with Gd or Ho in the same cell. As a typical example, the ioni-zation efficiency curve of Sm+ is compared with that of Hg+ ion from the background in Figure 1, curve I, or with Ca+ from CaF2 reduction in Figure 1, curve II, by using the semilog matching method, 3 4which con-sists of measuring the voltage shift requiredto match the initial portion of the ionization efficiency curve of the rare earth ion with that of the reference ion. With the known ionization potentials of Hg (10.43 ev) 2, 4 and that of Ca (6.11 ev), 2· 5 one obtains 5.56±0.10 ev for the ionization potential of Sm. This compares