Optical Properties of Terbium, Gadolinium, and Samarium Extracted from Reflection Electron Energy Loss Spectroscopy Spectra

Zhou, X. H. and Gong, J. M. and Li, Z. and Sulyok, Attila and Menyhárd, Miklós and Harada, Y. and Da, B. and Zeng, R. G. and Tőkési, Károly and Ding, Z. J. (2025) Optical Properties of Terbium, Gadolinium, and Samarium Extracted from Reflection Electron Energy Loss Spectroscopy Spectra. JOURNAL OF PHYSICAL CHEMISTRY C, 129 (13). pp. 6524-6534. ISSN 1932-7447

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Abstract

The frequency-dependent energy loss function and the related optical constants [refractive index n(ω) and extinction coefficient k(ω)] and dielectric functions [ε1(ω) and ε2(ω)] for three rare earth metals, i.e., terbium (Tb), gadolinium (Gd), and samarium (Sm), were derived in a wide range of energy loss up to around 200 eV from reflection electron energy loss spectroscopy (REELS) spectra. The latest reverse Monte Carlo analysis method was employed to subtract ELFs from REELS spectra, based on physical modeling of the electron transport in the surface region of a sample. The high accuracy of the subtracted ELFs was verified by applying the Thomas-Ritchie-Kuhn and the perfect-screening sum rules.

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