1. A hydrogen ion repelled by a bare Coulomb repulsion, e2/R, will move 0.1 Å in 10-15 sec when startinq from an R equal to the H-Si bond length.
2. For a review, see R. Gomer, this volume.
3. For reviews, see M. L. Knotek, this volume, and P. J. Feibelman, this volume.
4. D. Ramaker, this volume, and references therein.
5. D. R. Jennison, J. A. Kelber and R. R. Rye, Phys. Rev. B 25, 1384 (1982).