Abstract
AbstractWe measure the protonic conductivity in water clusters adsorbed on lysozyme powders, below room temperature In the low temperature region the conductivity increases with temperature as exp T6, in agreement with prediction by the theory of dissipative quantum tunneling. We detect the onset of this effect near 180 K, where a glass transition in the protein matrix is known to take place. Quantum tunneling matches smoothly with thermal hopping near 271 K.
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