Optical constants of organic insulators in the UV range extracted from reflection electron energy loss spectra

被引：6

作者：

Ridzel, Olga Yuryevna ^{[1
]}

Kalbe, Henryk ^{[2
]}

Astasauskas, Vytautas ^{[2
]}

Kuksa, Pavel ^{[2
]}

Bellissimo, Alessandra ^{[3
]}

Werner, Wolfgang S. M. ^{[2
]}

机构：

[1] Schlumberger Moscow Res Ctr, Reservoir Potential, Moscow, Russia

[2] Tech Univ Wien, Inst Angew Phys, Vienna, Austria

[3] Tech Univ Wien, Inst Photon, Vienna, Austria

来源：

SURFACE AND INTERFACE ANALYSIS | 2022年 / 54卷 / 05期

基金：

欧盟地平线“2020”;

关键词：

electron inelastic mean free path; insulators; optical constants; organic polymers; reflection electron energy loss spectroscopy; SURFACE EXCITATION PROBABILITY; MEAN FREE PATHS; DIELECTRIC FUNCTION; LOSS SPECTROSCOPY; SCATTERING; POLYSTYRENE; DNA;

D O I：

10.1002/sia.7055

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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.

引用

页码：487 / 500

页数：14