Proton double quantum coherence and cross-relaxation in (NH4)2SnBr6
| Autor: | Matti Punkkinen, A. Kaikkonen, M. Kankaanpää, Eero Ylinen, A.H. Vuorimäki |
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| Rok vydání: | 1998 |
| Předmět: |
Physics
Nuclear and High Energy Physics Magnetic Resonance Spectroscopy Radiation Proton Molecular Conformation Analytical chemistry Pulse sequence General Chemistry Cross relaxation Line width Ammonium compounds Nuclear magnetic resonance Organotin Compounds Instrumentation Spin-½ Double quantum coherence |
| Zdroj: | Solid State Nuclear Magnetic Resonance. 13:167-173 |
| ISSN: | 0926-2040 |
| DOI: | 10.1016/s0926-2040(98)00083-6 |
| Popis: | A proton double quantum coherence signal can be observed exclusively from the T species NH 4 groups (with the total spin I =1) in ammonium compounds at low temperatures by the three-pulse sequence 90° x − t pr –90° x − t ev –90° x − t a , where t pr and t a are of the magnitude of the inverse line width and t ev very short. The usefulness of this pulse sequence, preceded by the additional pulse sequence 90° x − t 1 –90° − x − t 2 for creating an unbalance between the A and T species magnetizations, was demonstrated by applying it to cross-relaxation studies in (NH 4 ) 2 SnBr 6 . |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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