Zalubas Romuald, Corliss Charles H
Institute for Basic Standards, National Bureau of Standards, Washington, D.C. 20234.
J Res Natl Bur Stand A Phys Chem. 1974 Mar-Apr;78A(2):163-246. doi: 10.6028/jres.078A.014.
The analysis of Th II has been extended with improved observations of the spectrum between 2000 and 25 000 Å. About 6500 lines are classified as transitions between 199 odd levels and 271 even levels. Of the 192 levels expected from the six odd configurations 5(6 + 7) and (6 + 7)7p, 188 are now known. In the even level system, all but one of the 37 levels of the three (6 + 7) configurations are known. Of the 268 levels predicted for the configurations 5 7 + 577 + 567 + 5 6, 235 are now known. The identifications are based on the theoretical calculations by N. Minsky. New Zeeman effect observations have increased the number of levels with known -values to 406 out of 470 known levels. The classifications will be useful in establishing secondary standards of wavelength.
通过对2000至25000埃之间光谱的改进观测，对钍II的分析得以扩展。约6500条谱线被归类为199个奇数能级与271个偶数能级之间的跃迁。在由5(6 + 7)和(6 + 7)7p这六种奇数组态所预期的192个能级中，现已知道188个。在偶数能级系统中，三个(6 + 7)组态的37个能级中除一个外均已知道。对于5 7 + 577 + 567 + 5 6组态所预测的268个能级，现已知道235个。这些识别基于N. 明斯基的理论计算。新的塞曼效应观测已使具有已知 值的能级数量在470个已知能级中增至406个。这些分类将有助于建立波长的二级标准。
