| | 1 | Author
| Haruo Niki, Ryokan Igei, Takuya Higa, Masao Hashimoto, Takahiro Isono | Requires cookie* | | | Title
| Lattice Imperfections and Relaxation of Cl NQR in Chloral Iso-Butylhemiacetal  | | | | Abstract
| The temperature dependence of the S/N ratios of three 35 C1 NQR lines (v l5 v 2 , v 3) in chloral iso-butylhemiacetal shows interesting features in the range 77-300 K. 35 C1 T y indicates that above 220 K reorientation of CC1 3 is excited, and this results in a gradual decrease in S/N. The activation energy calculated from 35 C1 NQR T l results is 30 kJ mol -1 for v x and v 2 but 25 kJ mol -1 for v 3 . The difference seems to be attributable to the motion of H in the OH group. A minimum of 35 C1 NQR T 2 is found around 180 K but 35 C1 T\ shows no anomaly. 35 C1 T 2 determines the S/N ratios in the range between 130-220 K. The line broadening below 130 K is attributable to an inhomo-geneity of the electric field gradient at resonant nuclei produced by lattice defects. | | | |
Reference
| Z. Naturforsch. 45a, 481—484 (1990); received August 26 1989 | | | |
Published
| 1990 | | | |
Keywords
| NQR, Lattice imperfections, Magnetic relaxation, Hydrogen bonding | | | |
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| 45 | |
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