AI Article Synopsis
- The sulfur isotope ratios measured using secondary ion mass spectrometry (SIMS) show that isotope fractionation varies significantly with secondary ion energy, particularly for ions with 2-10 eV excess energy, suggesting a strong dependence (about 9 per thousand per eV) on energy levels.
- Increased variability in the collection of low-energy ions can lead to inconsistent sulfur isotope ratios, emphasizing the importance of understanding this behavior to avoid measurement errors.
- The observed fractionation patterns for negative ions differ from established models for positive ions, indicating that the mechanisms behind negative secondary ion emission need further exploration and might require new theoretical frameworks.
Article Abstract
Secondary ion mass spectrometric (SIMS) measurements of sulfur isotope ratios obtained during sputtering with a Cs(+) beam and detection of negative secondary ions show a strong dependence of isotope fractionation on secondary ion energy for ions with approximately 2-10 eV excess kinetic energy (approximately 9 per thousand/eV), and a weak dependence for ions with approximately 10-approximately 350 eV (0.05 per thousand/eV). Variable collection of the low-energy ions could thus result in variable measured sulfur isotope ratios. Being aware of this behavior should allow the analyst to avoid such a problem. The fractionation of the isotopes does not appear to follow theoretical or measured behavior for positive ions, and suggests that, at least for sulfur, the process of negative secondary ion emission is incompletely understood and may require different theoretical models.
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| http://dx.doi.org/10.1002/rcm.789 | DOI Listing |
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