Far infrared study of the copper halides at low temperatures

J. N. Plendl, L. C. Mansur, A. Hadni, J. Claudel, Y. Henninger, G. Morlot, P. Strimer

The far infrared spectra of the copper halides CuCl, CuBr, and CuI have been measured in transmission and in reflection at various fixed temperatures from room temperature to liquid-helium temperature. Marked changes of such parameters as resonance frquency and damping as a function of temperature have been observed, also a line-splitting in the case of CuCl. In addition, a considerable increase in the asymmetry of the transmission curves with decreasing temperature has been observed. © 1966 Optical Society of America.

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Materials
Curve 1
Temperature K: 300 Wavelength Range, µm: 43.1-74.9 Geometry θ θ' ω: ~0°~0° Composition (weight percent), Specifications, and Remarks: Pressed pellet (2 mm thick); data extracted from smooth curve; Al on CuBr crystal reference standard.
Curve 2
Temperature K: 77 Wavelength Range, µm: 43.2-85.4 Geometry θ θ' ω: ~0°~0° Composition (weight percent), Specifications, and Remarks: Above specimen and conditions.
Curve 3
Temperature K: ~20 Wavelength Range, µm: 43.2-85.4 Geometry θ θ' ω: ~0°~0° Composition (weight percent), Specifications, and Remarks: Above specimen and conditions.
Curve 1
Temperature K: 300 Wavelength Range, µm: 45.2-123 Geometry θ θ' ω: ~0°~0° Composition (weight percent), Specifications, and Remarks: Film (9 µm thick) sublimed on quartz plate (2 mm thick); paraffin evaporated on film surface for protection; data extracted from smooth curve.
Curve 2
Temperature K: 77 Wavelength Range, µm: 45.2-100 Geometry θ θ' ω: ~0°~0° Composition (weight percent), Specifications, and Remarks: Above specimen and conditions.
Curve 3
Temperature K: 4.2 Wavelength Range, µm: 44.2-95.2 Geometry θ θ' ω: ~0°~0° Composition (weight percent), Specifications, and Remarks: Above specimen and conditions.
Curve 1
Temperature K: 300 Wavelength Range, µm: 38.0-85.1 Geometry θ θ' ω: ~0°~0° Composition (weight percent), Specifications, and Remarks: Pressed pellet (2 mm thick); data extracted from smooth curve; Al on CuCl crystal reference standard; comparison to single crystal showed no marked differences.
Curve 2
Temperature K: 77 Wavelength Range, µm: 39.4-85.1 Geometry θ θ' ω: ~0°~0° Composition (weight percent), Specifications, and Remarks: Above specimen and conditions.
Curve 3
Temperature K: ~20 Wavelength Range, µm: 39.5-85.1 Geometry θ θ' ω: ~0°~0° Composition (weight percent), Specifications, and Remarks: Above specimen and conditions.
Curve 1
Temperature K: 4.2 Wavelength Range, µm: 62.5-199 Geometry θ θ' ω: ~0°~0° Composition (weight percent), Specifications, and Remarks: Single crystal (4 mm thick); clear blue but somewhat opalescent looking; data extracted from smooth curve.
Curve 2
Temperature K: ~20 Wavelength Range, µm: 83.8-212 Geometry θ θ' ω: ~0°~0° Composition (weight percent), Specifications, and Remarks: Pressed pellet (2.3 mm thick); data extracted from smooth curve.
Curve 3
Temperature K: 4.2 Wavelength Range, µm: 94.0-200 Geometry θ θ' ω: ~0°~0° Composition (weight percent), Specifications, and Remarks: Above specimen and conditions.
Curve 4
Temperature K: 4.2 Wavelength Range, µm: 62.5-75.7 Geometry θ θ' ω: ~0°~0° Composition (weight percent), Specifications, and Remarks: Film (50 µm thick) sublimed on quartz plate (2 mm thick); paraffin evaporated on film surface for protection; data extracted from smooth curve.
Curve 5
Temperature K: 300 Wavelength Range, µm: 41.3-100 Geometry θ θ' ω: ~0°~0° Composition (weight percent), Specifications, and Remarks: Film (9 µm thick) sublimed on quartz plate (2 mm thick); paraffin evaporated on film surface for protection; data extracted from smooth curve.
Curve 6
Temperature K: 200 Wavelength Range, µm: 46.8-107 Geometry θ θ' ω: ~0°~0° Composition (weight percent), Specifications, and Remarks: Above specimen and conditions.
Curve 7
Temperature K: 77 Wavelength Range, µm: 41.8-90.1 Geometry θ θ' ω: ~0°~0° Composition (weight percent), Specifications, and Remarks: Above specimen and conditions.
Curve 8
Temperature K: ~20 Wavelength Range, µm: 42.4-90.1 Geometry θ θ' ω: ~0°~0° Composition (weight percent), Specifications, and Remarks: Above specimen and conditions.
Curve 9
Temperature K: 4.2 Wavelength Range, µm: 40.0-81.3 Geometry θ θ' ω: ~0°~0° Composition (weight percent), Specifications, and Remarks: Above specimen and conditions.
Curve 1
Temperature K: 300 Wavelength Range, µm: 44.1-83.2 Geometry θ θ': ~0°~0° Composition (weight percent), Specifications, and Remarks: Pressed pellet (2 mm thick); data extracted from smooth curve; Al on CsI crystal reference standard.
Curve 2
Temperature K: 77 Wavelength Range, µm: 44.6-83.6 Geometry θ θ': ~0°~0° Composition (weight percent), Specifications, and Remarks: Above specimen and conditions.
Curve 3
Temperature K: ~20 Wavelength Range, µm: 42.3-83.6 Geometry θ θ': ~0°~0° Composition (weight percent), Specifications, and Remarks: Above specimen and conditions.
Curve 1
Temperature K: 300 Wavelength Range, µm: 66.7-95.2 Geometry θ θ': ~0°~0° Composition (weight percent), Specifications, and Remarks: Film (4 µm thick) sublimed on quartz plate (2 mm thick); paraffin evaporated on film surface for protection; data extracted from smooth curve.
Curve 2
Temperature K: 77 Wavelength Range, µm: 66.7-95.2 Geometry θ θ': 0° 0° Composition (weight percent), Specifications, and Remarks: Above specimen and conditions.
Curve 3
Temperature K: 20 Wavelength Range, µm: 66.7-95.2 Geometry θ θ': ~0°~0° Composition (weight percent), Specifications, and Remarks: Above specimen and conditions.