Publications in Scientific Journals:
O. Ridzel, H. Kalbe, V. Astasauskas, P. Kuksa, A. Bellissimo, W.S.M. Werner:
"Optical constants of organic insulators in the UV range extracted from reflection electron energy loss spectra";
Surface and Interface Analysis,
2022
(2022),
1
- 14.
English abstract:
Reflection electron energy loss spectroscopy (REELS) spectra were measured for seven
insulating organic compounds (DNA, Irganox 1010, Kapton, polyethylene [PE],
poly(methyl methacrylate) [PMMA], polystyrene [PS] and polytetrafluoroethylene
[PTFE]). Optical constants and energy band gaps were extracted from the measured
REELS spectra after elimination of multiple electron scattering via a deconvolution and
fitting the normalised single scattering energy loss spectra to Drude and Drude-Lindhard
model dielectric functions, constrained by the Kramers-Kronig sum and f-sum rules. Satisfactory
agreement is found for those optical constants for which literature data exists.
For PTFE, the observed features in the optical data correspond to its electronic structure.
Keywords:
electron inelastic mean free path, insulators, optical constants, organic polymers, reflection electron energy loss spectroscopy
"Official" electronic version of the publication (accessed through its Digital Object Identifier - DOI)
http://dx.doi.org/10.1002/sia.7055
Electronic version of the publication:
https://publik.tuwien.ac.at/files/publik_303063.pdf