Published August 1979
| Version v1
Journal article
Proton NMR lineshapes of ammonium ions undergoing slow tunneling rotations
Description
The theory of NMR lineshapes has been outlined for tetrahedral four spin I=1/2 systems undergoing tunneling rotations. Expressions for tunneling Hamiltonian matrix elements are supplied as functions of seven overlap integrals related to symmetry rotations about 4 threefold and 3 twofold molecular axes. Ground torsional level structure is shown to determine NMR lineshape. Experimental proton NMR lineshapes measured at 4.2K for NH4Cl, NH4Br, NH4I, (NH4)2GaF6, (NH4)2AlF6, NH4SCN, NH4NO3, (NH4)2Ce(NO3)6, (NH4)2SiF6 have been analysed and ground torsional level structures are revealed. Tunneling splittings were obtained in most of the cases. (author)
Additional details
Publishing Information
- Journal Title
- Acta Phys. Pol., Ser. A
- Journal Volume
- 56
- Journal Issue
- 2
- Series
- Acta Phys. Pol., Ser. A.
- Journal Page Range
- 243-256
- ISSN
- 0587-4246
INIS
- Country of Publication
- Poland
- Country of Input or Organization
- Poland
- INIS RN
- 12576359
- Subject category
- S75: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY;
- Resource subtype / Literary indicator
- Numerical Data
- Descriptors DEI
- AMMONIUM COMPOUNDS; CRYSTAL LATTICES; EXPERIMENTAL DATA; FERMI STATISTICS; GROUND STATES; MOLECULAR STRUCTURE; NMR SPECTRA; PROTONS; ROTATION; TORSION; TUNNEL EFFECT; ULTRALOW TEMPERATURE
- Descriptors DEC
- BARYONS; CATIONS; CHARGED PARTICLES; CRYSTAL STRUCTURE; DATA; ELEMENTARY PARTICLES; ENERGY LEVELS; FERMIONS; HADRONS; HYDROGEN IONS; HYDROGEN IONS 1 PLUS; INFORMATION; IONS; NUCLEONS; NUMERICAL DATA; SPECTRA