TUNGSTEN ISOTOPE RATIO DETERMINATIONS BY NEGATIVE THERMAL IONIZATION MASS-SPECTROMETRY

被引：103

作者：

VOLKENING, J ^{[1
]}

KOPPE, M ^{[1
]}

HEUMANN, KG ^{[1
]}

机构：

[1] UNIV REGENSBURG,INST ANORGAN CHEM,W-8400 REGENSBURG,GERMANY

来源：

INTERNATIONAL JOURNAL OF MASS SPECTROMETRY AND ION PROCESSES | 1991年 / 107卷 / 02期

关键词：

D O I：

10.1016/0168-1176(91)80070-4

中图分类号：

O64 [物理化学（理论化学）、化学物理学]; O56 [分子物理学、原子物理学];

学科分类号：

070203 ; 070304 ; 081704 ; 1406 ;

摘要：

A precise determination of the isotopic abundances of tungsten with natural isotopic composition is presented. WO3- ions are generated by negative thermal ionization (NTI) in a double-filament ion source. La2O3 is used as a chemical substance to reduce the electron work function of the rhenium filament material. An ionization efficiency of 1% is obtained for sample loadings of 100 ng. The isotopic abundances are measured with relative standard deviations of 0.2% for the least abundant W-180 isotope and 0.02-0.004% for the other tungsten isotopes. These improved isotopic data are used to recalculate the atomic weight of tungsten as 183.8417 +/- 0.0001. The new NTI technique is an ideal tool for the application of isotope dilution mass spectrometry to analyse tungsten traces and for the measurement of isotopic shifts of this element in meteorites produced by the decay of Hf-182.

引用

页码：361 / 368

页数：8

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