TY - JOUR A1 - Pramann, A. A1 - Vogl, Jochen A1 - Rienitz, O. T1 - The Uncertainty Paradox: Molar Mass of Enriched Versus Natural Silicon Used in the XRCD Method N2 - The X-ray crystal density method uses silicon spheres highly enriched in 28Si as a primary method for the dissemination of the SI base unit kilogram yielding smallest possible uncertainties associated with the mass m within a few parts in 10-8. This study compares different available and newly developed analytical methods and their results for the determination of the molar mass M of silicon highly enriched in 28Si (Me) and of silicon (Mx) with an almost natural isotopic distribution. While for Me relative uncertainties urel(Me) in the lower 10-9 range are obtained routinely, it was not possible to fall below a value of urel(Mx) < 4 x 10-6 in the case of natural silicon, which is approximately three orders of magnitude larger. The application of the state-of the-art isotope ratio mass spectrometry accompanied with sophisticated thoroughly investigated methods suggests an intrinsic cause for the large uncertainty associated with the molar mass of natural silicon compared to the enriched material. KW - silicon KW - Molar mass KW - Isotope ratios KW - SI KW - Kilogram KW - Mole KW - XRCD method PY - 2020 DO - https://doi.org/10.1007/s12647-020-00408-y VL - 35 SP - 499 EP - 510 PB - Springer Verlag AN - OPUS4-51637 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Kazlagić, Anera A1 - Rosner, M. A1 - Cipriani, A. A1 - Frick, D. A. A1 - Glodny, J. A1 - Hoffmann, E. J. A1 - Hora, J. M. A1 - Irrgeher, J. A1 - Lugli, F. A1 - Magna, T. A1 - Meisel, T. C. A1 - Meixner, A. A1 - Possolo, A. A1 - Pramann, A. A1 - Pribil, M. J. A1 - Prohaska, T. A1 - Retzmann, Anika A1 - Rienitz, O. A1 - Rutherford, D. A1 - Paula-Santos, G. M. A1 - Tatzel, M. A1 - Widhalm, S. A1 - Willbold, M. A1 - Zuliani, T. A1 - Vogl, Jochen T1 - Characterisation of conventional 87Sr/86Sr isotope ratios in cement, limestone and slate reference materials based on an interlaboratory comparison study N2 - An interlaboratory comparison (ILC)was organised to characterise 87Sr/86Sr isotope ratios in geological and industrial reference materials by applying the so-called conventional method for determining 87Sr/86Sr isotope ratios. Four cements (VDZ 100a,VDZ 200a, VDZ 300a, IAG OPC-1), one limestone (IAG CGL ML-3) and one slate (IAG OU-6) reference materials were selected, covering a wide range of naturally occurring Sr isotopic signatures. Thirteen laboratories received aliquots of these six reference materials together with a detailed technical protocol. The consensus values for the six reference materials and their associated measurement uncertainties were obtained by applying a Gaussian, linear mixed effects model fitted to all the measurement results. By combining the consensus values and their uncertainties with an uncertainty contribution for potential heterogeneity, reference values ranging from 0.708134 mol mol-1 to 0.729778 mol mol-1 were obtained with relative expanded uncertainties of ≤ 0.007 %. This study represents an ILC on conventional 87Sr/86Sr isotope ratios, within which metrological principles were considered and the compatibility of measurement results obtained by MC-ICP-MS and by MC-TIMS is demonstrated. The materials characterised in this study can be used as reference materials for validation and quality control purposes and to estimate measurement uncertainties in conventional 87Sr/86Sr isotope ratio measurement. KW - Sr isotope analysis KW - Isotope ratios KW - Cement KW - Geological material KW - MC-TIMS KW - MC-ICP-MS KW - Interlaboratory comparison KW - Measurement uncertainty KW - Cconventional method PY - 2023 UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-579836 DO - https://doi.org/10.1111/ggr.12517 SN - 1639-4488 VL - 47 IS - 4 SP - 821 EP - 840 PB - Wiley online library AN - OPUS4-57983 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Seena Prem, Pranav T1 - Investigation of Instrumental Isotope Fractionation in ICPMS N2 - Instrumental Isotopic Fractionation (IIF) is the fractionation of isotopes within the mass spectrometer, resulting in a deviation of the measured isotope ratio from the true isotope ratio in a sample. The foremost challenge in obtaining highly precise and accurate absolute isotope ratio measurements lies in implementing adequate corrections for IIF. The causes of IIF are not yet completely understood and differ according to the type of instrument. We are using certified isotope reference materials to investigate the IIF behavior in in different types of ICPMS instruments with different mass separation devices including double focusing sector field (single and multicollector), quadrupole filter and time-of-flight ICPMS. T2 - DAAS PhD Seminar CY - Berlin, Germany DA - 16.11.2023 KW - Isotope ratios KW - Instrumental Isotope Fractionation KW - MCICPMS PY - 2023 AN - OPUS4-61722 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Bashiri, Termeh A1 - Yu, Phelan A1 - Hutzler, Nicholas R. A1 - Steimle, Timothy C. A1 - Abad Andrade, Carlos Enrique A1 - Okumura, Mitchio T1 - A Molecular Beam Spectroscopic Study of the A2Π − X2Σ + Band of CaF Isotopologues N2 - This study presents an experimental determination of spectroscopic parameters for the less-abundant isotopologues 42CaF and 44CaF, alongside 40CaF, by high resolution laser-induced fluorescence spectroscopy in a skimmed free jet expansion. We recorded spectra near the natural linewidth limit and derived spectroscopic constants for both 𝑋2𝛴+ and 𝐴2𝛱 states, including the fine and 19F magnetic hyperfine parameters. We also estimated the r(44Ca/40Ca) isotope amount ratio, demonstrating the potential use of optical spectroscopy for isotope analysis. KW - High-resolution spectroscopy KW - Molecular beam spectrometer KW - Isotope ratios KW - Isotopologues KW - Calcium KW - CaF KW - Calcium fluoride PY - 2025 DO - https://doi.org/10.1016/j.jms.2025.112023 SN - 1096-083X VL - 410 SP - 1 EP - 6 PB - Elsevier Inc. AN - OPUS4-63506 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - INPR A1 - Bashiri, Termeh A1 - Yu, Phelan A1 - Hutzler, Nicholas R. A1 - Steimle, Timothy C. A1 - Abad Andrade, Carlos Enrique A1 - Okumura, Mitchio T1 - A Molecular Beam Study of the (0,0) A2Π<- X2Σ+ Band of CaF Isotopologues N2 - This study presents an experimental determination of spectroscopic parameters for the less-abundant isotopologues 42CaF and 44CaF, alongside 40CaF, by high resolution laser-induced fluorescence spectroscopy in a skimmed free jet expansion. We recorded spectra near the natural linewidth limit and derived spectroscopic constants for both X2Σ+ and A2Π states, including the fine and 19F magnetic hyperfine parameters. We also estimated the r (44Ca/40Ca) isotope amount ratio, demonstrating the potential use of optical spectroscopy for isotope analysis. KW - High-resolution spectroscopy KW - Molecular beam spectrometer KW - Isotope ratios KW - Calcium isotopes KW - Isotopologues PY - 2025 UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-648804 DO - https://doi.org/10.48550/arXiv.2505.03045 SP - 1 EP - 23 PB - Cornell University AN - OPUS4-64880 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -