Document Type

Article

Publication Date

11-1978

Journal or Book Title

Physical Review B

Volume

18

Issue

10

First Page

5740

Last Page

5749

DOI

10.1103/PhysRevB.18.5740

Abstract

The reflectances of single crystals of the trifluorides of La, Ce, Pr, Nd, Dy, and of polycrystalline GdF3 were measured in the 10-34-eV region, along with 5-9-eV transmission measurements on films of these materials. Localized 4f→5d, 6stransitions on the rare-earth ions give rise to the absorption below 10 or 11 eV. Strong interband absorption gives anisotropic reflectance peaks in the 10-15-eV region, presumably from F− 2p valence bands to lanthanide 5d, 6s (and other states) conduction bands, accounting for about one-third of the expected F− 2p osillator strength. Transitions from lanthanide 5p levels cause two types of spectra beginning around 20 eV: transitions of the 5p→5d type, apparently localized on lanthanide ions, but with some an isotropy; and transitions of 5p electrons to the conduction band, giving a peak of very high reflectance at energies above 27 eV.

Comments

This article is from Physical Review B 18 (1978): 5740, doi:10.1103/PhysRevB.18.5740. Posted with permission.

Copyright Owner

The American Physical Society

Language

en

File Format

application/pdf

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