Infrared emission spectra

Sheppard, N. The Use of Fourier Transform Methods for the Measurement of Infrared Emission Spectra, in Analytical Applications of FT-IR to Molecular Systems, J. Durig (Ed.) D. Reidel, 1980, p. 125... 

Infrared emission spectra have been used to extract the concentrations of HN03 (33), N2Oi5 (34, 35), and N20 (36) from balloon-borne, cryogenically cooled interferometers. 

Kunde, V.G., J.C. Brasunas, W.C. Maguire, J.R. Herman, S.T. Massie, M.M. Abbas, L. Herath and W.A. Shaffer (1988) Measurement of nighttime stratospheric from infrared emission spectra. Geophysical Research Letters 15 1177-1180. 

Infrared emission spectra (86, 87) are usually obtained at elevated temperatures,... 

A reason for this different behavior became clear when the film thickness measurement was attempted. The film thickness was less than 1500 A once rotation was started and remained that way as the speed was increased. The liquid crystal must have changed to an isotropic liquid of low viscosity. Unfortunately, the film thickness was too thin to yield adequate infrared emission spectra by the methods we had used successfully before on normal liquid lubricants in EHD contacts However, the absence of polarization was consistent with the pressure of a liquid. 

For background information on infrared spectral changes with changes of phase such as might occur in the lubricant under shear, infrared emission spectra were obtained under static conditions at different temperatures. For this purpose, a small amount of liquid crystal was sandwiched between a KBr window and a stainless steel plate and emission spectra were obtained at different temperatures. The thickness of the layer was not determined but judging from the spectra, must have been about 1.0 pm. Stainless steel had to be used to avoid chemical reaction with acidic liquid crystal. 

Additional information can be obtained from the infrared emission spectra (lES) with increasing temperature (Figure 13). The spectra at low temperature do not clearly show the presence of water because die water bending mode normally observed at 1645 cm is obscured by the t>antisynnn(C=0) around 1620 cm". This makes it impossible to follow the dehydration step. The oxalate is further characterised by a broad band around 1640 cm plus a sharper band around 1325 cm , which can be ascribed to t>symm(C=0) mode. The relatively sharp band at 788 cm can be ascribed to 8(0-C-0) [42],... 

Identification of Rocket Motor Characteristics from Infrared Emission Spectra... 

Infrared emission spectra of alkali chloroaluminates and related melts, J.Hvlstendahl, P.Klaeboe, E.Rytter and H.A.Oye, Inorg. Chem., 1964, 23, 706. 

Coblentz, W.W., Investigations of Infrared Spectra. Part i Absorption spectra part ii Infrared absorption spectra part ii Infrared emission spectra, Carnegie Institution of Washington (Pub. No. 35) Washington, D C., 1905, pp. 1-330. 

INFRARED EMISSION SPECTRA OF CONDENSED-PHASE SAMPLES... 

Low, M. J. D., and I. Coleman, 1966. The measurement of infrared emission spectra using multiple-scan interferometry. Spectrochim. Acta 22 369. 

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