Infrared spectral emittance of InAs

D. L. Stierwalt, R. F. Potter

The infrared absorption spectra for a p-type InAs sample were determined by measuring the spectral emittance at 77, 203, and 373°K. The spectra contained features which are identified with optical edge transitions, free-carrier absorption, intervalence-band transitions, multiphonon absorption and the reststrahlen band. The two-phonon spectra are analyzed in detail. Using selection rules, assignments at the critical points , L, and X are given for the optical and acoustical modes. It is found that the "sum rule" for lattice modes is in good agreement with the assignments. © 1965 The American Physical Society.

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Materials
Curve 1
Temperature K: 77 Wavelength Range, µm: 3.30-15.0 Geometry θ': ~0° Composition (weight percent), Specifications and Remarks: 0.4 mm thick, pressed and mechanically polished to a parallel sided slab; data measured at 10⁻⁴ mm Hg; data extracted from smooth curve.
Curve 2
Temperature K: 203 Wavelength Range, µm: 3.80-15.0 Geometry θ': ~0° Composition (weight percent), Specifications and Remarks: Above specimen and conditions.
Curve 3
Temperature K: 373 Wavelength Range, µm: 2.90-15.0 Geometry θ': ~0° Composition (weight percent), Specifications and Remarks: Above specimen and conditions.
Curve 4
Temperature K: 77 Wavelength Range, µm: 15.0-40.0 Geometry θ': ~0° Composition (weight percent), Specifications and Remarks: Above specimen and conditions.
Curve 5
Temperature K: 203 Wavelength Range, µm: 15.0-40.0 Geometry θ': ~0° Composition (weight percent), Specifications and Remarks: Above specimen and conditions.