Open AccessInfluence of the core‐hole effect on optical properties of magnesium oxide (MgO) near the Mg L ‐edge region
Author(s) -
Sinha Mangalika,
Modi Mohammed H.,
Ghosh Haranath,
Yadav P. K.,
Gupta R. K.
Publication year - 2018
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s1600577518002771
Subject(s) - exciton , magnesium , core (optical fiber) , synchrotron radiation , absorption edge , synchrotron radiation source , spectral line , materials science , absorption (acoustics) , optical spectra , spectroscopy , enhanced data rates for gsm evolution , absorption spectroscopy , molecular physics , atomic physics , chemistry , analytical chemistry (journal) , optics , condensed matter physics , physics , optoelectronics , band gap , chromatography , quantum mechanics , astronomy , metallurgy , composite material , telecommunications , computer science
The influence of the core‐hole effect on optical properties of magnesium oxide (MgO) is established through experimental determination of optical constants and first‐principles density functional theory studies. Optical constants (δ and β) of MgO thin film are measured in the spectral region 40–300 eV using reflectance spectroscopy techniques at the Indus‐1 synchrotron radiation source. The obtained optical constants show strong core exciton features near the Mg L ‐edge region, causing significant mismatch with Henke's tabulated values. On comparing the experimentally obtained optical constants with Henke's tabulated values, an edge shift of ∼3.0 eV is also observed. Distinct evidence of effects of core exciton on optical constants (δ and β) in the near Mg L ‐edge absorption spectra are confirmed through first‐principles simulations.