Channeling of H+ and H-2+ ions of energies between 1.0 and 2.0 MeV in
100!-textured polycrystalline diamond films grown by microwave plasma
-assisted chemical-vapor deposition has been observed with Rutherford
backscattering. The width of the orientational distribution of the dia
mond crystallites as deduced from the measured projectile velocity dep
endence of the observed channeling angular scans amounted to about 1-d
egrees.