modify your search
Results for DC.creator="A." AND DC.creator="Kirfel" in section 1.11.2 of volume D |
Local tensorial susceptibility of cubic crystals
International Tables for Crystallography (2013). Vol. D, Section 1.11.2.3, pp. 271-272 [ doi:10.1107/97809553602060000910 ]
... cubic symmetry the second-rank tensor is isotropic, so that a global anisotropy is absent (but it exists for tensors of ... are chosen here as in International Tables for Crystallography Volume A (Hahn, 2005); the first one being adopted if Volume A offers two alternative origins. The expressions (1.11.2.10) or (1.11.2.11) ...
Screw-axis forbidden reflections
International Tables for Crystallography (2013). Vol. D, Section 1.11.2.2.2, p. 271 [ doi:10.1107/97809553602060000910 ]
... reflections still remain forbidden. For instance, in the case of a screw axis, there is no anisotropy of susceptibility in the ...
Glide-plane forbidden reflections
International Tables for Crystallography (2013). Vol. D, Section 1.11.2.2.1, pp. 270-271 [ doi:10.1107/97809553602060000910 ]
... the glide-plane forbidden reflections, there may, for instance, exist a glide plane perpendicular to the axis, i.e. any point is ... vanishes. This is the well known conventional extinction rule for a glide plane, see International Tables for Crystallography Volume A (Hahn, 2005). If, however, is a tensor, the ...
Tensorial structure factors and forbidden reflections
International Tables for Crystallography (2013). Vol. D, Section 1.11.2.2, pp. 270-271 [ doi:10.1107/97809553602060000910 ]
... of allowed reflections, listed in International Tables for Crystallography Volume A (Hahn, 2005) for all space groups and for all types ... of symmetry-related atoms have different orientations in space. As a result, forbidden reflections can in fact be excited just due ... be deduced from equation (1.11.2.1). The structure factor of a reflection with reciprocal-lattice vector is proportional to the ...
General symmetry restrictions
International Tables for Crystallography (2013). Vol. D, Section 1.11.2.1, p. 270 [ doi:10.1107/97809553602060000910 ]
... and is the associated vector of translation. The index indicates a transposed matrix, and summation over repeated indices is implied hereafter. ... invariant against all generators of the group . There is a simple direct method for obtaining obeying equation (1.11.2.1): we can ... where is the number of elements in the group . A small problem is that is infinite for any space ...
Symmetry restrictions on local tensorial susceptibility and forbidden reflections
International Tables for Crystallography (2013). Vol. D, Section 1.11.2, pp. 270-272 [ doi:10.1107/97809553602060000910 ]
... we start with the simple but very important case of a symmetric tensor of rank 2 defined in the Cartesian system ... and is the associated vector of translation. The index indicates a transposed matrix, and summation over repeated indices is implied hereafter. ... invariant against all generators of the group . There is a simple direct method for obtaining obeying equation (1.11.2.1): we ...
International Tables for Crystallography (2013). Vol. D, Section 1.11.2.3, pp. 271-272 [ doi:10.1107/97809553602060000910 ]
... cubic symmetry the second-rank tensor is isotropic, so that a global anisotropy is absent (but it exists for tensors of ... are chosen here as in International Tables for Crystallography Volume A (Hahn, 2005); the first one being adopted if Volume A offers two alternative origins. The expressions (1.11.2.10) or (1.11.2.11) ...
Screw-axis forbidden reflections
International Tables for Crystallography (2013). Vol. D, Section 1.11.2.2.2, p. 271 [ doi:10.1107/97809553602060000910 ]
... reflections still remain forbidden. For instance, in the case of a screw axis, there is no anisotropy of susceptibility in the ...
Glide-plane forbidden reflections
International Tables for Crystallography (2013). Vol. D, Section 1.11.2.2.1, pp. 270-271 [ doi:10.1107/97809553602060000910 ]
... the glide-plane forbidden reflections, there may, for instance, exist a glide plane perpendicular to the axis, i.e. any point is ... vanishes. This is the well known conventional extinction rule for a glide plane, see International Tables for Crystallography Volume A (Hahn, 2005). If, however, is a tensor, the ...
Tensorial structure factors and forbidden reflections
International Tables for Crystallography (2013). Vol. D, Section 1.11.2.2, pp. 270-271 [ doi:10.1107/97809553602060000910 ]
... of allowed reflections, listed in International Tables for Crystallography Volume A (Hahn, 2005) for all space groups and for all types ... of symmetry-related atoms have different orientations in space. As a result, forbidden reflections can in fact be excited just due ... be deduced from equation (1.11.2.1). The structure factor of a reflection with reciprocal-lattice vector is proportional to the ...
General symmetry restrictions
International Tables for Crystallography (2013). Vol. D, Section 1.11.2.1, p. 270 [ doi:10.1107/97809553602060000910 ]
... and is the associated vector of translation. The index indicates a transposed matrix, and summation over repeated indices is implied hereafter. ... invariant against all generators of the group . There is a simple direct method for obtaining obeying equation (1.11.2.1): we can ... where is the number of elements in the group . A small problem is that is infinite for any space ...
Symmetry restrictions on local tensorial susceptibility and forbidden reflections
International Tables for Crystallography (2013). Vol. D, Section 1.11.2, pp. 270-272 [ doi:10.1107/97809553602060000910 ]
... we start with the simple but very important case of a symmetric tensor of rank 2 defined in the Cartesian system ... and is the associated vector of translation. The index indicates a transposed matrix, and summation over repeated indices is implied hereafter. ... invariant against all generators of the group . There is a simple direct method for obtaining obeying equation (1.11.2.1): we ...
powered by |