Theory of Nuclear Spin Conversion in thePhase of Solid Methane
- 21 February 1977
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 38 (8), 408-411
- https://doi.org/10.1103/physrevlett.38.408
Abstract
The dominant mechanism for spin conversion in solid C in the phase is found to be a hybrid process in which intramolecular dipolar interactions mix the nuclear spin states, and the intermolecular octupole interaction, modulated by phonon emission, causes transitions between orientational states. The conversion rate calculated for free rotor molecules is 31 to 54% per hour. The mechanism is shown to be inefficient for ordered molecules which are estimated to convert at least 1000 times slower.
Keywords
This publication has 16 references indexed in Scilit:
- CH4: Tunneling states, rotations, and phase transition in a quantum molecular crystalSolid State Communications, 1975
- Theory of ortho-para conversion in solid hydrogen at high densitiesPhysical Review B, 1975
- Spin conversion in solid methane: Proton magnetization and spin-lattice relaxationPhysica, 1973
- A quantum statistical mechanical study of an extended James—Keenan model as applied to solid methaneChemical Physics Letters, 1973
- Structure and Phase Transitions of Solid Heavy Methane (CD4)The Journal of Chemical Physics, 1972
- Slow neutron scattering in the low temperature phase of solid methanePhysics Letters A, 1970
- Theory of Phase Transitions in Solid Methanes. IVProgress of Theoretical Physics, 1969
- Nuclear magnetic resonance measurements of solid methane during the conversion to its ground statePhysics Letters A, 1968
- Theory of Phase Transitions in Solid Methanes. I. Electrostatic Multipole–Multipole InteractionThe Journal of Chemical Physics, 1968
- Theory of Phase Transitions in Solid Heavy MethaneThe Journal of Chemical Physics, 1959