Neutron Inelastic Scattering Studies of Globular Compounds
The use of neutron inelastic scattering measurements to determine the nature of the solid-state transitions in globular compounds is proposed and exemplified. Patterns were taken of the high- and low-temperature phases of solid cyclohexane, 2-2-dimetaylbutane, and 1 -4-diazo-bicyclo(2.2.2)-octane. The flrst two have broad inelastic scattering peaks in the low-temperature phase. In the hightemperature phase, these peaks disappear and the elastic peak broadens markedly. These changes are attributed to quasi-free-rotation'' of the molecules. Inelastic peaks do not appear in 1-4-dazo-bicyclo-(2.2.2) -octane, and the elastic peak does not broaden appreciably in the hightemperature phase. Self-diffusion coefficients D/sub 3/ = 4.5 x 10/sup -5/ cm/sup 2//sec for cyclohexane and D/sub 3/ = 8.6 x 10/sup -5/ cm/sup 2//sec for 2-2-dimethylbutane were determined from the pattenns of the liquids at 300 deg K using the small motions'' approximation. These values are larger than those obtained from NMR measurements, presumably as a result of irreversible rotation of the molecules.
- Research Organization:
- Atomic Energy of Canada Limited (AECL), Chalk River, ON (Canada)
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-17-029419
- OSTI ID:
- 4712175
- Journal Information:
- Journal of Chemical Physics, Vol. 38, Issue 7; Other Information: Orig. Receipt Date: 31-DEC-63; ISSN 0021-9606
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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