| Autor: |
Guillaume, F., Sourisseau, C., Dianoux, A. J. |
| Předmět: |
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| Zdroj: |
Journal of Chemical Physics; 9/1/1990, Vol. 93 Issue 5, p3536, 6p |
| Abstrakt: |
Inelastic incoherent neutron scattering experiments were performed on semi-oriented samples of C19H40 –urea chlatrates over the 1.5–306 K temperature range. Using appropriate sample orientations and different instrumental resolutions, all the motions parallel or perpendicular to the main chain axes were analyzed in the 0–400 cm-1 frequency range. In the quasielastic region and for the Q momentum transfer vector parallel to the chain axes, a side peak attributed to a longitudinal acoustic mode was evidenced at 12 cm-1 at 1.5 K (overdamped at higher temperatures) in addition to large quasielastic broadenings due to restricted translational motions. For Q perpendicular to the chains, a diffusive rotational process was also evidenced in the disordered solid phase. All these results are discussed and compared to literature data. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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