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- W1966881010 abstract "Abstract Quantum tunneling processes are often of interest in the consideration of hydrogen transport. The nuclear magnetic resonance (NMR) spin-lattice relaxation time T1 provides a particularly convenient signature to distinguish between hopping and tunneling processes. Using as examples, deuterated and normal benzoic acid (BA), and hydrogen glasses of the form R1−x(NH4)xH2AsO4 (RADA-X), typical NMR signatures of hopping/tunneling processes will be discussed. A unified treatment is presented which demonstrates the extraction of potential barrier ‘V’, quantum-well asymmetry ‘A’, and both hopping and tunneling rate constants. Three regions are discussed; (1) a ‘high’-temperature (HT) hopping region, (2) a ‘low-temperature’ (LT) incoherent tunneling regime, and finally (3) at very low temperature, a region where T1 is essentially temperature-independent. This last region is discussed in terms of coherent quantum tunneling." @default.
- W1966881010 created "2016-06-24" @default.
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- W1966881010 date "1999-10-01" @default.
- W1966881010 modified "2023-10-16" @default.
- W1966881010 title "Hydrogen tunneling or hopping – how can we know?" @default.
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- W1966881010 doi "https://doi.org/10.1016/s0167-2738(99)00153-8" @default.
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