Effect of Microstructure of Graphite on the Nonreductive Thermal Ion Emission in Thermal Ionization Mass Spectrometry

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	Effect of Microstructure of Graphite on the Nonreductive Thermal Ion Emission in Thermal Ionization Mass Spectrometry
	Wei, H. Z.2; Jiang, S. Y.1; Xiao, Y. K.1
	2010-02-25
发表期刊	JOURNAL OF PHYSICAL CHEMISTRY A
卷号	114 期号:7 页码:2427-2437
摘要	The emission behavior of polyatomic ions in the ionization source of thermal ionization mass spectrometry (TIMS) was investigated. The results Suggest that the presence of a graphite promoter plays a key role for the formation and stable emission of polyatomic ions, such as M(2)X(+), M(2)BO(2)(+), Cs(2)NO(2)(+), and Cs(2)CNO(+). Our data further implied that the intensity of M(2)X(+) and M(2)BO(2)(+) increases and the emission temperature decreases with increasing cationic and anionic radius. During the boron isotopic measurement using the Cs(2)BO(2)(+)-graphite-PTIMS method, the isobaric interference ion Cs(2)CNO(+) cannot be transformed from nitrate or organic compounds containing an amide group but can be induced by the existence of trace amounts of boron because of its special electron-deficiency property (B(3+)). Characterization on the planar crystalline structure of various graphite samples with SEM, TEM, and Raman spectroscopy confirmed the relationship of the emission capacity of polyatomic ions and the crystal microstructure of graphite and provides direct evidence that graphite with a perfect parallel and equidistant layer orientation shows a beneficial effect on the emission of polyatomic ions in TIMS. The mechanism study on the formation of polyatomic ions opens the possibility to establish high precision methods for isotopic composition analysis of more nonmetal elements with the TIMS technique.
语种	英语
引用统计
文献类型	期刊论文
条目标识符	http://ir.isl.ac.cn/handle/363002/5924
专题	青海盐湖研究所知识仓储中国科学院青海盐湖研究所
作者单位	1.Chinese Acad Sci, Qinghai Inst Salt Lakes, Xining 810003, Peoples R China 2.Nanjing Univ, Dept Earth Sci, State Key Lab Mineral Deposits Res, Nanjing 210093, Peoples R China
推荐引用方式 GB/T 7714	Wei, H. Z.,Jiang, S. Y.,Xiao, Y. K.. Effect of Microstructure of Graphite on the Nonreductive Thermal Ion Emission in Thermal Ionization Mass Spectrometry[J]. JOURNAL OF PHYSICAL CHEMISTRY A,2010,114(7):2427-2437.
APA	Wei, H. Z.,Jiang, S. Y.,&Xiao, Y. K..(2010).Effect of Microstructure of Graphite on the Nonreductive Thermal Ion Emission in Thermal Ionization Mass Spectrometry.JOURNAL OF PHYSICAL CHEMISTRY A,114(7),2427-2437.
MLA	Wei, H. Z.,et al."Effect of Microstructure of Graphite on the Nonreductive Thermal Ion Emission in Thermal Ionization Mass Spectrometry".JOURNAL OF PHYSICAL CHEMISTRY A 114.7(2010):2427-2437.