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The environment-sensitive mobility of near-surface edge and screw dislocations around indentations in LiF, MgO, and NaCl has been studied. It is demonstrated that, contrary to recent reports, adsorbed species can markedly affect dislocation mobility in the absence of either surface step formation or significant reductions in surface free energy. The mechanistic significance of this is discussed.

CeHe/CeHsN 4 0.182 ± 0.008 96.9 ± 2.4 0 " From decomposition of the appropriate azo compounds at 118°in sealed ampoules degassed three times. 6 Each sample analyzed in duplicate by glpc. " Relative rates of disproportionation to combination as moles -arylethane/mole 2,3-diarylbutane. d From standard plots using 0.1 M biphenyl as internal standard. " The yield is given as a range since it increases with time up to the value 54%, after which time it remains constant. f No values given since pyridine obscured the disproportionation product peak in the glpc trace. 0 Acetophenone was added and the solution rechecked to prove pyridine was not obscuring that peak also, which it was not. h The only analysis on this solution was 4 days after opening.