| Zugriffsnummer | 26558 |
| Dokumenttyp | Zeitschriftenartikel |
| Peer Review | unbekannt |
| Sprache | Englisch |
| Titel | Nuclear magnetic relaxation in water revisited |
| Autor(in); Institution |
Hartwig, Stefan; 8.2, Biosignale, PTB-Berlin
Voigt, Jens; 8.2, Biosignale, PTB-Berlin
Scheer, Hans-Jürgen; 8.2, Biosignale, PTB-Berlin
Albrecht, Hans-Helge; 8.2, Biosignale, PTB-Berlin
Burghoff, Martin; 8.2, Biosignale, PTB-Berlin
Trahms, Lutz; 8.2, Biosignale, PTB-Berlin
|
| Quelle/Jahr | The Journal of Chemical Physics: 135 (2011), 5, 054201-1 - 054201-4 |
| ISSN | 0021-9606 (PRINT) ; 1089-7690 (ONLINE) |
| DOI | |
| Verlag | Melville, NY: AIP |
| Klassifikationscode | PACS: 76.60.Es ; PACS: 85.25.Dq |
| Freie Schlagworte | proton magnetic resonance ; spin-lattice relaxation ; SQUIDs ; water |
| Zusammenfassung | In this study, we revisited nuclear magnetic relaxation of 1H in water at very low Larmor frequencies that has been studied intensively in earlier years. We make use of the recently developed superconducting quantum interference device based ultra-low field NMR technique, which enables much easier access to the longitudinal spin-lattice relaxation time T1 and the transversal spin-spin relaxation time T2 below several kHz than traditional field cycling methods. Our data reproduce and complement the earlier results, in that they corroborate the finding of an exchange process with a correlation time of about 0.34 ms at room temperature which can be attributed to the migration of hydronium and hydroxyl ions in neutral water via hydrogen bridges. The corresponding relaxation process is driven by the interaction of the protons with 17O and contributes to the T1 and the T2 relaxation rate by about 0.12 s−1. In addition, we found evidence of a very slow exchange process at about 100 Hz that has hitherto not been reported. |
