RESONANT-COHERENT EXCITATION OF CHANNELED IONS

A first-principles calculation of the resonant-coherent excitation of planar-channeled hydrogenic ions is presented. The interplay between c oherent interaction with the periodic crystal lattice potential and in elastic electron-electron collisions is shown to be crucial in both in traionic transitions and electron loss from the ion. The magnitude of resonant-coherent excitation is predicted to oscillate with the amplit ude of the oscillations of the ion trajectory. Good agreement is found with experiments.