Methyl Group Rotation and Nuclear Relaxation at Low Temperatures |
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Common terms and phrases
A-type absorption signal activation energies C3-axis calculation carrier wave CH2D chapter Chem Clough coaxial tube considered corresponds denotes density matrix dependence described determined dipolar hamiltonian dipolar polarization dipolar relaxation dipolar signal dipolar system dipolar temperature dispersion signal E-type eigen functions eigenfunctions Emid energy difference equilibrium expectation values exponential frequency frequency modulation given helium inter-molecular dipolar interaction inter-relaxation inverse temperature Lagrange multipliers Larmor frequency lattice temperature low temperatures lowest rotational magnetic field magnetic quantum magnitude matrix elements measurements methyl group modulation molecular molecules nitromethane NMR signal obtain operators phase phonon Phys preamplifier proton spin-lattice relaxation protons relaxation behaviour relaxation equations resonance line rf field rotational energy rotational levels saturation sixfold barrier spin diffusion spin system spin-lattice relaxation SRSD symmetry type transition probabilities tunnelling splitting tunnelling system varicap voltage y-picoline Zeeman and dipolar Zeeman relaxation Zeeman signal Zeeman system