Constitutive equations for polymer melts and solutions by Ronald G. Larson

By Ronald G. Larson

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5. Digital Noise and Dynamic Range Digital noise problems of two types may be experienced in FT-IR spectroscopy, namely, word length in specifying intensity and word density in specifying frequency. The problem of word length results from the large dynamic range of signals from the interferometer. Consistent with the qualitative notions of a Fourier transform, the interferogram which corresponds to a broad spectral range is extremely strong at zero pathlength difference and the amplitude of the oscillations decreases very rapidly.

In addition to the principal peak for v3 of N 1 6 0 2 , N 1 6 0 1 8 0 , and N 1 8 0 2 three weaker peaks were observed for each isotopomer, however no conclusions could be reached about their origin. Other matrix-isolated molecules show a similar behavior (see Green et al, 1976). In most cases, these "matrix effects" are either not resolved by the spectrometer or are ignored by the investigator. I). 0 cm" 1 , respectively. 0 cm" 1 (Gillette and Eyster, 1939). E. 36 eV (Herbst et al, 1974). 5). Each of the following reactions is exoergic in an Ar matrix provided that the coulomb attraction energy of the ion pair is about 88 kcal mol" 1 .

In this study, 6-, 12-, and 25-μιη beam splitters were used with polyethylene windows and a silicon deposition substrate at 4°K. Small carbon polymers and their hydrides are important high-temperature species because graphite is often used in high-temperature applications; and they are of interest in astrophysics as well. The matrix-isolation method provides a convenient means of stabilizing these reactive species for spectroscopic study after in situ formation by photolysis. Figure 21 compares the far-infrared spectra of the photolysis products of CH 3 CCH(a), CH 3 CCD(b), CD 3 CCH(c), and CD 2 CCD 2 (d) obtained by Jacox and Milligan (1974).

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