Extending Estimating Hydrogen Content in Atom Probe Tomography Experiments Where H 2 Molecule Formation Occurs
Meier MS, Jones ME, Felfer P, Moody MP, Haley D (2022)
Publication Type: Journal article
Publication year: 2022
Journal
Book Volume: 28
Pages Range: 1231-1244
Journal Issue: 4
DOI: 10.1017/S1431927621012332
Abstract
We investigated a new method for estimating specimen hydrogen content in atom probe tomography (APT) in experiments where molecular hydrogen ions originating from the measurement environment can overlap with deuterium (D+) in the mass-to-charge-state spectrum, thus preventing the direct application of isotopic marking for unambiguous hydrogen analysis. First, we applied an existing method for hydrogen content estimation, using ratios obtained from paired deuterated/nondeuterated experiments. These measurements demonstrated sufficient residual uncertainty to motivate exploring an alternative method to accurately estimate hydrogen content. By varying the time between evaporation events, it is then shown that a highly correlated relationship between field evaporation rate and hydrogen content exists and can also be used to predict hydrogen content. This leads to a new method for measuring hydrogen content within the specimen. We combine this extrapolation technique with continuous cycling of the evaporation rate or pulse frequency during an APT experiment. This could enable spatially resolved imaging of hydrogen concentrations despite the presence of a contaminant background hydrogen signal, without the need for deuteration.
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United Kingdom (GB)How to cite
APA:
Meier, M.S., Jones, M.E., Felfer, P., Moody, M.P., & Haley, D. (2022). Extending Estimating Hydrogen Content in Atom Probe Tomography Experiments Where H 2 Molecule Formation Occurs. Microscopy and Microanalysis, 28(4), 1231-1244. https://dx.doi.org/10.1017/S1431927621012332
MLA:
Meier, Martin S., et al. "Extending Estimating Hydrogen Content in Atom Probe Tomography Experiments Where H 2 Molecule Formation Occurs." Microscopy and Microanalysis 28.4 (2022): 1231-1244.
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