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Proton Jump Rates in Palladium-Hydride 50-100 K

  • S. R. Kreitzman
  • R. L. Armstrong
Part of the NATO Conference Series book series (NATOCS, volume 6)

Abstract

Proton jump rates in ß-Palladium-Hydride (H/Pd=.82, .65) have been measured using the NMR technique of dipolar relaxation in the strong collision, low temperature regime. The results show distinct negative curvatures in the logarithm of the jump rate versus temperature. This is in complete contrast to the positive curvature encountered in a classical sum of activated processes. Specifically we find the behaviour of the relaxation rate to be of the form 1/T1D=const.Tν•exp(−Ta/T), with
$$ \eqalign{ & \nu \left( {.82} \right) = - 8.4 \pm 1,{T_a}\left( {.82} \right) = 1424 \pm 100K \cr & \nu \left( {.65} \right) = - 5.7 \pm .7,{T_a}\left( {.65} \right) = 1284 \pm 60K. \cr} $$
$$\eqalign{ & \nu \left( {.82} \right) = - 8.4 \pm 1,{T_a}\left( {.82} \right) = 1424 \pm 100K \cr & \nu \left( {.65} \right) = - 5.7 \pm .7,{T_a}\left( {.65} \right) = 1284 \pm 60K. \cr} $$
These results are discussed in the light of the small polaron theory of quantum diffusion.

Keywords

Negative Curvature Jump Rate Jump Time Dipolar Relaxation Rapid Comm 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Plenum Press, New York 1983

Authors and Affiliations

  • S. R. Kreitzman
    • 1
  • R. L. Armstrong
    • 1
  1. 1.Department of PhysicsUniversity of TorontoTorontoCanada

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