Optical properties of MgH2 measured in situ in a novel gas cell for ellipsometry/spectrophotometry

Details Optical properties of MgH2 measured in situ in a novel gas cell for ellipsometry/spectrophotometry Optical properties of MgH2 measured in situ in a novel gas cell for ellipsometry/spectrophotometry

2003-05-18

arxiv.org/abs/cond-mat/0305418v1

Physics

Condensed Matter

Materials Science

REVTeX4, 15 pages, 12 figures, 5 tables

Scientific paper

10.1103/PhysRevB.68.115112

The dielectric properties of alpha-MgH2 are investigated in the photon energy range between 1 and 6.5 eV. For this purpose, a novel sample configuration and experimental setup are developed that allow both optical transmission and ellipsometric measurements of a transparent thin film in equilibrium with hydrogen. We show that alpha-MgH2 is a transparent, colour neutral insulator with a band gap of 5.6 +/- 0.1 eV. It has an intrinsic transparency of about 80% over the whole visible spectrum. The dielectric function found in this work confirms very recent band structure calculations using the GW approximation by Alford and Chou [J.A. Alford and M.Y. Chou (unpublished)]. As Pd is used as a cap layer we report also the optical properties of PdHx thin films.

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