{"title":"Spectral structure of trebly ionized thorium, Th IV","authors":"P.F.A. Klinkenberg","doi":"10.1016/0378-4363(88)90312-9","DOIUrl":null,"url":null,"abstract":"<div><p>The level scheme of trebly ionized thorium atoms is extended and the ionization limit is determined at 231 065 cm<sup>−1</sup> (Ky), corresponding to an ionization potential of 28.65 V, with an uncertainty of ±0.03 V. The Stark shifts of low levels in both Th IV and Th III are shown to be connected with the extreme sensitivity of the 5f-orbital to external electric fields, owing to the peculiar shape of the natural effective potential.</p></div>","PeriodicalId":101023,"journal":{"name":"Physica B+C","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"1988-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0378-4363(88)90312-9","citationCount":"12","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Physica B+C","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/0378436388903129","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 12
Abstract
The level scheme of trebly ionized thorium atoms is extended and the ionization limit is determined at 231 065 cm−1 (Ky), corresponding to an ionization potential of 28.65 V, with an uncertainty of ±0.03 V. The Stark shifts of low levels in both Th IV and Th III are shown to be connected with the extreme sensitivity of the 5f-orbital to external electric fields, owing to the peculiar shape of the natural effective potential.
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