Influence of the core‐hole effect on optical properties of magnesium oxide (MgO) near the Mg L‐edge region |
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| Authors: | Mangalika Sinha Mohammed H Modi Haranath Ghosh P K Yadav R K Gupta |
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| Affiliation: | 1. Soft X-ray Applications Laboratory, Synchrotrons Utilization Section, Raja Ramanna Centre for Advanced Technology, Indore452013, India;2. Homi Bhabha National Institute, Anushakti Nagar, Mumbai, Maharashtra400094, India;3. Human Resource Development Section, Raja Ramanna Centre for Advanced Technology, Indore452013, India |
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| Abstract: | 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. |
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| Keywords: | synchrotron radiation soft X‐ray magnesium compound core‐hole effect optical property |
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