Author
C. V. Stephenson
Bio: C. V. Stephenson is an academic researcher from Southern Research Institute. The author has contributed to research in topics: Infrared spectroscopy & Irradiation. The author has an hindex of 5, co-authored 5 publications receiving 239 citations.
Papers
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TL;DR: In this article, the Raman and infrared spectra of five monosubstituted benzenes have been measured and the spectra were assigned on the basis of C 2v symmetry.
133 citations
TL;DR: The degradation of polyethylene, nylon, Mylar, and Acrilan is faster when irradiated in an inert atmosphere of nitrogen than it is when irradiation is in vacuo as mentioned in this paper.
Abstract: Polyethylene, Teflon, nylon, Mylar, and Acrilan have been irradiated in vacuo and in an atmosphere of nitrogen with narrow bands of ultraviolet radiation centered at 244, 314, and 369 μ and with monochromatic ultraviolet light of wavelength 253.7 μ. The physical properties of all these polymers are ultimately degraded by ultraviolet light of any of these wavelengths, but the shorter wavelengths are much the more effective in producing changes. The degradation of polyethylene, nylon, Mylar, and Acrilan is faster when irradiation is in an inert atmosphere of nitrogen than it is when irradiation is in vacuo. Teflon, however, degrades more rapidly in vacuo than in a nitrogen atmosphere.
35 citations
32 citations
30 citations
TL;DR: In this paper, the vapor-phase contours of the far infrared bands of 2-fluoro- and 2-chloropyridine indicate that the 600 and 400 cm−1 bands arise from an in-plane and an out-of-plane vibration.
Abstract: Infrared spectra in the cesium bromide region are presented for 43 monosubstituted pyridines. Two- and 3-substituted pyridines are characterized in this region by two relatively intense bands near 600 and 400 cm−1. No strong characteristic bands are found for 4-substituted pyridines. The vapor-phase contours of the far infrared bands of 2-fluoro- and 2-chloropyridine indicate that the 600 and 400 cm−1 bands arise, respectively, from an in-plane and an out-of-plane vibration. The pyridine spectra are compared with the spectra of some substituted benzenes.
15 citations
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TL;DR: In this paper, the infrared spectrum between 33 and 400 cm−1 has been examined in the vapor and liquid phases for the following 26 compounds: o-, m-, and p-F, Cl, Br, and CH3 benzaldehydes; pyridine-2-, -3-, and 4-aldeydes; acetophenone and its o-,m-, andp- F derivatives; furan-2-aldehyde; and several monofluorostyrenes and -nitrobenzenes.
149 citations
TL;DR: In this article, the polymerization kinetics of an uncatalyzed polyester based thermoplastic polyurethane formulation was characterized with Raman spectroscopy, measuring the normalized scattering intensity of a band originating from the TPU diisocyanate, conversion was calculated as a function of time.
144 citations
TL;DR: In this article, the potential function governing internal rotation of bipbenyl and nitrobenzene has been determined by Raman spectroscopy, and the calculated barriers to internal rotation are compared with those determined previously for structurally similar molecules.
131 citations
TL;DR: In this article, Ramaman and FTIR were used to obtain the fundamental vibrational modes assigned with the aid of a B3LYP/6-311+G** calculation, without the need for scaling of the force constants.
114 citations
TL;DR: A vibrational analysis of the spectra of anisole and of the ortho, meta and para substituted fluoro, chloro and bromo derivatives has been carried out in this article.
111 citations