VOLKENING, J and KOPPE, M and HEUMANN, KG (1991) TUNGSTEN ISOTOPE RATIO DETERMINATIONS BY NEGATIVE THERMAL IONIZATION MASS-SPECTROMETRY. INTERNATIONAL JOURNAL OF MASS SPECTROMETRY AND ION PROCESSES, 107 (2). pp. 361-368. ISSN 0168-1176,
Full text not available from this repository.Abstract
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.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | SOLAR-SYSTEM; |
| Depositing User: | Dr. Gernot Deinzer |
| Last Modified: | 19 Oct 2022 08:46 |
| URI: | https://pred.uni-regensburg.de/id/eprint/54946 |
Actions (login required)
 |
View Item |
