Decay of zerodegree focusing of channeled ions
Abstract
We present here a study of the effect of zerodegree focusing of C ^{6+} ions moving along the <100> channels of a Si crystal. The ion energy is 25 MeV and the thickness of the crystal is varied from 0 to 5000 atomic layers. The angular distributions of the channeled ions were obtained via the numerical solution of the equations of motion of the ion using the Lindhard's expression for the continuum interaction potential, and the computer simulation method. The analysis shows that the effect of zerodegree focusing has a periodic behaviour. It also shows that the maxima of the zerodegree yield of the channeled ions decay with the thickness of the crystal. This decay can be described by a sum of two exponential functions.
 Publication:

Nuclear Instruments and Methods in Physics Research B
 Pub Date:
 July 1996
 DOI:
 10.1016/0168583X(95)014942
 Bibcode:
 1996NIMPB.115..337M