Fock, J; Bogart, LK; Posth, O; Hansen, MF; Pankhurst, QA; Frandsen, C; (2016) Uncertainty budget for determinations of mean isomer shift from Mössbauer spectra. Hyperfine Interactions , 237 , Article 23. 10.1007/s10751-016-1253-1.

Text 2016 HypInt Mossbauer isomer shift uncertainty budget.pdf - Published Version Access restricted to UCL open access staff Download (1MB)

Abstract

The magnetite/maghemite content within iron oxide nanoparticles can be determined using the mean isomer shift (δ¯¯δ¯). However, accurate characterisation of the composition is limited by the uncertainty associated with δ¯¯δ¯. We have identified four independent sources of uncertainty and developed a quantitative expression for the uncertainty budget. Sources of uncertainty are categorised as follows: that from the fitting of the Mössbauer spectrum (σ fit), that of the calibration of the α-Fe reference spectrum (σ cal), thermal corrections to the spectrum due to second order Doppler shift (SODS) (σ Δδ ) and other experimental errors (σ err). Each contribution is discussed in detail using 57Fe Mössbauer spectra obtained from an iron oxide nanoparticle system at temperatures between 16 K and 295 K on different spectrometers in two different laboratories.

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