Proton tunnelling frequencies in ammonium salts from spin-lattice relaxation
- 28 October 1977
- journal article
- Published by IOP Publishing in Journal of Physics C: Solid State Physics
- Vol. 10 (20) , 4137-4147
- https://doi.org/10.1088/0022-3719/10/20/023
Abstract
Proton reorientation tunnelling in many NH4+salts gives a frequency independent minimum in both T1and T1 rhoat the transition to classical relaxation at about 40-70K. The average tunnel frequency is approximately: f1approximately=4*109Ti1( rho )min,(Hz when T1or T1 rhois in s). Tunnel frequencies are derived from T1and T1 rhomeasurements on NH4ClO4, cubic and trigonal (NH4)2SiF6, (NH4)2SnCl6, (NH4)2Ce(NO3)6, (NH4)2Cr2O7and literature data, and compared with tunnel frequencies calculated from barrier heights.Keywords
This publication has 22 references indexed in Scilit:
- Nuclear spin-lattice relaxation of tunnelling molecular groupsJournal of Physics C: Solid State Physics, 1976
- Evidence for Spin Isomerism from Proton Magnetic Resonance Studies of (NH4)2PtBr6 and (NH4)2PtCl6Canadian Journal of Physics, 1974
- A model for a temperature-dependent frequency distribution of methyl group tunnelling splittingsJournal of Physics C: Solid State Physics, 1974
- A nuclear resonance and infrared investigation of the motional states of methyl groups in solidsJournal of Physics C: Solid State Physics, 1973
- Proton spin-lattice relaxation and exchange splitting of the torsional ground state in NH4ClO4Chemical Physics Letters, 1973
- Einfluß von Quanteneffekten der Methylgruppenrotation auf die Kernrelaxation in FestkörpernZeitschrift für Naturforschung A, 1971
- Magnetic Resonance Study of Molecular Motion in Cubic (NH4)2SiF6The Journal of Chemical Physics, 1967
- Tunneling through High Periodic Barriers. II. Application to Nuclear Magnetic Resonance in SolidsThe Journal of Chemical Physics, 1957
- Hindered Rotation in Molecules with Relatively High Potential BarriersThe Journal of Chemical Physics, 1957
- Structural Investigations by Means of Nuclear Magnetism. III. Ammonium HalidesThe Journal of Chemical Physics, 1954