Spectral restoration in high resolution electron energy loss spectroscopy based on iterative semi-blind Lucy-Richardson algorithm applied to rutile surfaces

Rémi Lazzari, Jingfeng Li, Jacques Jupille
2015 Review of Scientific Instruments  
Electron energy loss spectroscopy with parallel readout of energy and momentum Review of Scientific Instruments 88, 033903 (2017); https://doi. A new spectral restoration algorithm of reflection electron energy loss spectra is proposed. It is based on the maximum likelihood principle as implemented in the iterative Lucy-Richardson approach. Resolution is enhanced and point spread function recovered in a semi-blind way by forcing cyclically the zero loss to converge towards a Dirac peak.
more » ... c phonon spectra of TiO 2 are used as a test bed to discuss resolution enhancement, convergence benefit, stability towards noise, and apparatus function recovery. Attention is focused on the interplay between spectral restoration and quasi-elastic broadening due to free carriers. A resolution enhancement by a factor up to 6 on the elastic peak width can be obtained on experimental spectra of TiO 2 (110) and helps revealing mixed phonon/plasmon excitations. C 2015 AIP Publishing LLC. [http://dx.
doi:10.1063/1.4905433 pmid:25638096 fatcat:x4djl3w4hzg75nmyszhydnb4fi