Implementation of Gold deconvolution for enhanced energy resolution in EEL spectra
2011 (English)In: Ultramicroscopy, ISSN 0304-3991, E-ISSN 1879-2723, Vol. 111, no 2, 79-89 p.Article in journal (Refereed) Published
Gold’s iterative deconvolution algorithm has been applied to one-dimensional EEL spectra from hexagonal BN. The experimental resolution was varied from 1.1 to 2.25 eV and Gold’s algorithm was able to restore low-loss and core-loss spectra overall well. To estimate the instrument response function, the most convenient method was to extract the zero-loss peak from the low-loss spectrum. It was also found as suggested by Egerton, that by using low-loss spectra as kernel, enhanced energy resolution could be obtained as plural scattering was simultaneously removed. It’s further shown how the FWHM of the p* peak in the boron K‑edge of hexagonal BN is reduced from 1.4 to 0.7 eV with almost no noise-amplification after 500 iterations while resolving the s* doublet. The result was almost identical after a stunning 5 000 - 10 000 iterations, implying that Gold’s method converges and can be stable for a large number of iterations. However, for lower-intensity spectra the number of iterations is limited. The results close to the intense zero-loss peak were uncertain and further testing with better experimental resolution is recommended. It’s also found that to improve the resolution and not just sharpen the spectra, a large number of iterations is required.
Place, publisher, year, edition, pages
2011. Vol. 111, no 2, 79-89 p.
EELS, Gold deconvolution, Resolution improvement, Hexagonal boron nitride
Research subject Physics
IdentifiersURN: urn:nbn:se:su:diva-49663DOI: 10.1016/j.ultramic.2010.10.006ISI: 000286552200001OAI: oai:DiVA.org:su-49663DiVA: diva2:379130