A simple experimental indication of the Fourier coefficients which are sensitive to hand is given in CBED patterns by those non-zero Laue zone reflections which clearly break a mirror line that is present in the zero Laue zone. It has been found possible to determine the chirality of thin crystals of Ho2Ge2O7 and of Bi12GeO24 by interpreting the relative intensity of such reflections with a three-beam calculation. Multislice calculations which matched the experimental patterns gave the same chirality. It is found that projections which contain mirrors are the most practical to use since they can be easily aligned.
|Publication status||Published - 1994|