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- W2079320377 abstract "An investigation has been made of the variation with temperature of the proton magnetic resonance absorption line-width of four long chain aliphatic compounds and eight aromatic hydrocarbons. The aliphatic compounds are dimorphous. In the lower temperature modification it is concluded that the molecules are rigid at 95°K, but that an increasing number of molecules rotate about their length as the temperature increases; it seems unlikely that rotational oscillation alone can account for the observed reduction of line-width as the temperature increases. In the upper temperature modification all the molecules rotate. There was no evidence of molecular rotation in naphthalene up to the melting point. Benzene, however, shows a sharp line-width transitions at about 110°K. It is suggested that this is due to tunnelling or rotation of the molecules about their hexagonal axes. Since only a small fraction of the number of molecules need rotate in order to bring about a reduction in line-width, the hypothesis of molecular rotation in solid benzene is not incompatible with the interpretation by Kastler and Fruhling of the Raman spectral lines as due to the rotational oscillation of molecules in the solid. The xylenes, mesitylene, and hexamethylbenzene show internal rotation of the CH3 groups at all temperatures above 95°K. In addition, hexamethylbenzene has a line-width transition over the range 135–210°K, attributed to tunnelling or rotation of the molecules about their hexagonal axes. Preliminary results are given of measurements on other organic compounds (durene, pentamethylbeneze and hexaethylbenzene)." @default.
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- W2079320377 date "1951-03-01" @default.
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- W2079320377 title "Nuclear resonance in solid hydrocarbons" @default.
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- W2079320377 doi "https://doi.org/10.1016/0031-8914(51)90082-1" @default.
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