Optical properties of insulators in the extreme ultraviolet.

G. Stéphan, J. C. Lemonnier, S. Robin

A reflectometer adaptable to the exit slit of a grazing-incidence monochromator is developed to investigate the optical properties of crystals or evaporated layers before exposure to air in the region 100–1000 Å (124–12.4 eV). The optical constants are determined by three methods and one of them is new and based on the state of polarization of the light emerging from the monochromator. The real and imaginary parts of the dielectric constant and the energy-loss function (−Im∊−1) are given for Pyrex, corundum, and ruby and for polished and cleaved crystals of LiF and CaF2. The possibility of a plasma level is discussed from experimental curves.

DOI badge Download BibTeX How to cite Download dataset

Materials
Curve 1
Temperature Range, K: 298 Wavelength Range, µm: 0.0301-0.0972 Geometry θ θ' ω': 30° 30° Composition (weight percent), Specifications, and Remarks: Polished; measured in vacuum; data extracted from smooth curve.
Curve 2
Temperature Range, K: 298 Wavelength Range, µm: 0.0215-0.120 Geometry θ θ' ω': 60° 60° Composition (weight percent), Specifications, and Remarks: Cleaved; measured in vacuum.
Curve 3
Temperature Range, K: 298 Wavelength Range, µm: 0.0305-0.120 Geometry θ θ' ω': 30° 30° Composition (weight percent), Specifications, and Remarks: Above specimen and conditions.
Curve 1
Temperature K: 298 Wavelength Range, µm: 0.0306-0.103 Geometry θ θ' ω': 30° 30° Composition (weight percent), Specifications, and Remarks: Cleaved; measured in vacuum.
Curve 2
Temperature K: 298 Wavelength Range, µm: 0.0306-0.103 Geometry θ θ' ω': 60° 60° Composition (weight percent), Specifications, and Remarks: Above specimen and conditions.
Curve 3
Temperature K: 298 Wavelength Range, µm: 0.0372-0.0985 Geometry θ θ' ω': 30° 30° Composition (weight percent), Specifications, and Remarks: Polished; measured in vacuum; data extracted from smooth curve.
Curve 1
Temperature, K: 298 Wavelength Range, µm: 0.0400-0.0972 Geometry (θ, θ', W): 20, 20 Composition (weight percent), Specifications, and Remarks: Measured in vacuum; data extracted from smooth curve.
Curve 2
Temperature, K: 298 Wavelength Range, µm: 0.0275-0.1000 Geometry (θ, θ', W): 60, 60 Composition (weight percent), Specifications, and Remarks: Measured in vacuum; data extracted from smooth curve.