Open AccessMultinuclear Spin‐Lattice Relaxation Time Studies of Supercooled Aqueous LiCl‐Solutions
Author(s) -
Lang E. W.,
Prielmeier F. X.
Publication year - 1988
Publication title -
berichte der bunsengesellschaft für physikalische chemie
Language(s) - English
Resource type - Journals
ISSN - 0005-9021
DOI - 10.1002/bbpc.198800178
Subject(s) - supercooling , deuterium , proton , relaxation (psychology) , aqueous solution , spin–lattice relaxation , proton spin crisis , chemistry , diffusion , self diffusion , conductivity , thermodynamics , lithium (medication) , condensed matter physics , atomic physics , physics , nuclear physics , medicine , psychology , social psychology , self service , marketing , business , endocrinology
Recent deuteron ( 2 H) spin‐lattice relaxation time ( T 1 ) measurements in undercooled 11 m LiCl/D 2 O solutions are supplemented by proton ( 1 H) and lithium ( 6 Li)— T 1 as well as self‐diffusion coefficient measurements in undercooled 11 m LiCl/H 2 O solutions. The motional model for orientational fluctuations, proposed recently to interpret the 2 H — T 1 experiments, is slightly modified and is shown to describe the relaxation time curves of all nuclei ( 2 H, 1 H, 6 Li) with only one adjustable parameter for light and heavy water. Self‐diffusion coefficients serve to calculate the contribution to the relaxation rates from positional fluctuations of the spin‐bearing particles. It is found that D ( 1 H) > D ( 7 Li) and that the proton mobility is less strongly slowed down when the temperature is lowered towards the glass temperature. Possible relations between this excess proton mobility and a recently observed excess proton conductivity are discussed.
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