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A quantum mechanical treatment of the effects of stacking faults on dechannelling is given. A simple harmonic model for the planar potential due to two planes surrounding the channel, and the corresponding bound states in the potential are considered. At the stacking fault boundary, these states make transitions for which the probabilities have been calculated, using the `sudden approximation'.

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A 60 MeV Ag primary ion beam was used to generate secondary recoil ion beams of Cl, K, Ca, Sc, Ti, V, Mn and Cu in the energy range 0.1-0.6 MeV n −1 . The stopping power in the carbon absorber was measured and compared with Lindhard, Scharff and Schiott (LSS) theory, the Northcliffe and Schilling model and semiempirical estimates of Ziegler et al (1985). Data for heavier ions of Ag, I and Au from other sources was also considered in order to extend the scope of such a comparison. LSS theory was found to satisfy the data within a narrow mid-velocity range (∼0.6-0.8v 0 Z 2/3 1 , where v 0 is Bohr velocity). Estimates made by Ziegler et al were seen to generally agree to within a few per cent except for energies below 0.2 MeV n −1 , where deviations as high as 25% were seen. Expected Z 1 oscillations could not be discerned down to the lowest ion velocities (v = 2v 0 ) so far attempted.