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Comparison of the Isotopic Composition of Silicon Crystals Highly Enriched in$ ^{28}$Si
| Content Provider | MDPI |
|---|---|
| Author | Rienitz, Olaf Pramann, Axel |
| Copyright Year | 2020 |
| Description | The isotopic composition and molar mass M of silicon in a new crystal (code: Si28-33Pr11) measured by isotope ratio mass spectrometry using a high-resolution multicollector-inductively coupled plasma mass spectrometer (MC-ICP-MS) is presented using the virtual-element isotope dilution mass spectrometry (VE-IDMS) method. For this new crystal, M = 27.976 950 48 (16) g/mol was determined with urel(M) = 5.7 × 10−9. The “X-ray-crystal-density (XRCD) method”, one of the primary methods for realizing and disseminating the SI units kilogram and mole in the recently revised SI, is based on “counting” silicon atoms in silicon single crystal spheres. One of the key quantities is the isotopic composition—expressed by the molar mass M—of the three stable isotopes 28Si, 29Si, and 30Si in the material highly enriched in 28Si. M was determined with lowest possible uncertainty using latest improvements of the experimental techniques. All uncertainties were estimated according to the “Guide to the expression of uncertainty in measurement, GUM”. The results of the new crystal are discussed and compared with the four previously available crystals, establishing a worldwide limited pool of primary reference spheres of highest metrological quality. |
| Starting Page | 500 |
| e-ISSN | 20734352 |
| DOI | 10.3390/cryst10060500 |
| Journal | Crystals |
| Issue Number | 6 |
| Volume Number | 10 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2020-06-11 |
| Access Restriction | Open |
| Subject Keyword | Crystals Analytical Chemistry Silicon Single Crystals Molar Mass Isotope Ratios Mass Spectrometry Si Revision Mole Dissemination Kilogram Dissemination |
| Content Type | Text |
| Resource Type | Article |
