Yuryevna Ridzel, O., Kalbe, H., Astašauskas, V., Kuksa, P., Bellissimo, A., & Werner, W. S. M. (2022). Optical constants of organic insulators in the UV range extracted from reflection electron energy loss spectra. Surface and Interface Analysis, 54(5), 487–500. https://doi.org/10.1002/sia.7055
E134-01 - Forschungsbereich Applied and Computational Physics
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Journal:
Surface and Interface Analysis
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ISSN:
0142-2421
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Date (published):
2022
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Number of Pages:
14
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Publisher:
WILEY
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Peer reviewed:
Yes
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Keywords:
Condensed Matter Physics; General Chemistry; Surfaces, Coatings and Films; Materials Chemistry; electron inelastic mean free path; insulators; optical constants; organic polymers; reflection electron energy loss spectroscopy; Surfaces and Interfaces
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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.
