| | 1 | Author
| David Stephenson | Requires cookie* | | | Title
| Two-dimensional Two Contact Double Resonance Spectroscopy  | | | | Abstract
| A two-dimensional spectroscopic technique is presented. Application of the technique to de-termine all the relaxation rates for a multi-level quadrupole system is discussed along with ex-perimental requirements. Theoretical and experimental data are analyzed for the 14 N, three level, spin 1 system. The analysis shows that all three relaxation rates can be obtained from a single two-dimensional spectrum, and that only 3 peaks in the 3 x 3 two-dimensional intensity matrix are needed to completely specify the problem. The 4-level spin 3/2 system is also examined. In theory, all six relaxation rates can be independently evaluated (for a suitable system) without necessitating measurement at the low frequency Zeeman separated levels. | | | |
Reference
| Z. Naturforsch. 55a, 79—82 (2000); received September 11 1999 | | | |
Published
| 2000 | | | |
Keywords
| NQR, 14 N, Relaxation, Two-dimensional, Cross-relaxation | | | |
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| default:Reihe_A/55/ZNA-2000-55a-0079.pdf | | | | Identifier
| ZNA-2000-55a-0079 | | | | Volume
| 55 | |
| 2 | Author
| Hiroyuki Ishida | Requires cookie* | | | Title
| H NMR Study of Ionic Motions in High Temperature Solid Phases of (CH 3 NH 3 ) 2 ZnCl 4 | | | | Abstract
| The reorientation of the tetrahedral complex anion ZnCl 4 2-and the self-diffusion of the cation in (CH 3 NH3) 2 ZnCl4 were studied by 'H NMR spin-lattice relaxation time ('H T X) experiments. In the second highest-temperature phase, the temperature dependence of *H T X observed at 8.5 MHz could be explained by a magnetic dipolar-electric quadrupolar cross relaxation between 'H and chlorine nuclei, and the activation energy of the anion motion was determined to be 105 kJ mol -1 . In the highest-temperature phase, the activation energy of the self-diffusion of the cation was determined to be 58 kJ mol -1 from the temperature and frequency dependence of 'H T X . | | | |
Reference
| Z. Naturforsch. 55a, 412—114 (2000); received January 8 2000 | | | |
Published
| 2000 | | | |
Keywords
| Nuclear Magnetic Resonance, Molecular Motion, Cross Relaxation, (C^N^^ZnCfj | | | |
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| default:Reihe_A/55/ZNA-2000-55a-0412.pdf | | | | Identifier
| ZNA-2000-55a-0412 | | | | Volume
| 55 | |
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