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- W2020600650 abstract "The 1H nuclear spin-lattice relaxation process in glycerol has been studied at temperatures from 3.5 K to 300 K over a very wide range of Larmor frequency between 236 kHz (0.00554 T) and 21.0 MHz (0.4932 T). A superconducting quantum interference device (SQUID) was used to detect the longitudinal component of magnetization of the proton at very low frequencies below 1.62 MHz. At sufficiently low temperatures the nuclear spin-lattice relaxation rate obeys a relation 1/T1∝(T2/ωβ)∫6/T0[(x dx)/sinh x], (with β around 0.9 below 25 K), implying that the relaxation rate is governed by an excitation of low-frequency disordered modes inherent to the glassy state of glycerol and becomes asymptotically 1/T1∝T2 below T = 3 K and 1/T1∝T above T = 3 K. The relaxation phenomena can be interpreted as the nuclear spin flipping associated with a Raman process which is induced by a coupling of thermally activated low-frequency disordered modes or low-frequency excitation (LFE) with a phonon bath. The LFE originates from a quantum-mechanical two-level system (TLS) reflecting an asymmetric-double-well (ASDW) potential which is formed by the hydrogen bonding configuration in the glassy state of glycerol. The maximum characteristic asymmetry of the double-well potential was found to be (3±1) K. This quantum-mechanical molecular motion dominates the other relaxation mechanisms at low temperatures, such as the dipolar relaxation due to molecular classical reorientation with distributed correlation times." @default.
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- W2020600650 date "2000-05-31" @default.
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- W2020600650 title "Tunnelling molecular motion in glassy glycerol at very low temperatures as studied by1H SQUID nuclear magnetic resonance" @default.
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- W2020600650 doi "https://doi.org/10.1088/0953-8984/12/24/307" @default.
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