VOLKENING, J and WALCZYK, T and HEUMANN, KG (1991) OSMIUM ISOTOPE RATIO DETERMINATIONS BY NEGATIVE THERMAL IONIZATION MASS-SPECTROMETRY. INTERNATIONAL JOURNAL OF MASS SPECTROMETRY AND ION PROCESSES, 105 (2). pp. 147-159. ISSN 0168-1176,
Full text not available from this repository.Abstract
A new technique for osmium isotope ratio determinations by negative thermal ionization mass spectrometry using the formation of OsO3- ions is presented. Different filament materials and chemicals to reduce the electron work function are investigated. With Ba(OH)2 and platinum as filament material an ionization efficiency of more than 1% is obtained for nanogram sample amounts. The isotopic abundances of a laboratory standard are measured with relative standard deviations of less than 0.01% for the most abundant isotopes. This significant improvement in the precision of the osmium isotopic measurements, compared with previous investigations, provides a suitable tool to develop a Re-Os age determination method on this basis. The new isotopic data could also be used to recalculate the atomic weight of osmium to be 190.2251 +/- 0.0001, which is much better in uncertainty than the current IUPAC data.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | SURFACE-IONIZATION; RHENIUM; QUANTITIES; |
| Depositing User: | Dr. Gernot Deinzer |
| Last Modified: | 19 Oct 2022 08:46 |
| URI: | https://pred.uni-regensburg.de/id/eprint/55036 |
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