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C0UPLED RELAXATI0N BEHAVI0UR IN METHYL GROUP C0MP0UNDS
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A-type absorption signal activation energies barrier to rotation calculation carrier wave CH2D chapter Chem Clough coaxial tube compounds considered contribution correlation corresponds curve denotes density matrix described determined dipolar hamiltonian dipolar polarization dipolar relaxation dipolar signal dipolar system E-type Emid equilibrium expectation values experimental data exponential factor function given inter-molecular dipolar interaction inter-relaxation inverse temperature Lagrange multipliers Larmor frequency low temperatures lowest rotational magnetic field magnetic quantum magnitude matrix elements methyl group minimum modulation molecular molecules natural abundance nitromethane NMR signal nuclear susceptibility obtain phonon Phys proton spin-lattice relaxation Quantum Mechanics relaxation behaviour relaxation equations relaxation mechanisms relaxation rate rf field rotational energy rotational levels rotator eigenfunctions rotator-phonon interaction sample saturation sixfold barrier spin system spin-lattice relaxation symmetry type theoretical fit three protons threefold barrier tion transition probabilities tunnelling splitting tunnelling system voltage y-picoline Zeeman and dipolar Zeeman relaxation Zeeman signal Zeeman system zijn