Rotation-function space groups
نویسندگان
چکیده
منابع مشابه
Rotation in the Space
The position of a point after some rotation about the origin can simply be obtained by multiplying its coordinates with a matrix. One reason for introducing homogeneous coordinates is to be able to describe translation by a matrix so that multiple transformations, whether each is a rotation or a translation, can be concatenated into one described by the product of their respective matrices. How...
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It frequently occurs that a biological assembly in a crystallographic asymmetric unit has more than one noncrystallographic symmetry operator. For instance, a tetramer might have the point group 222 or a spherical virus will have the point group 532. A self-rotation function searches for the direction and angle of rotation of the individual noncrystallographic symmetry operations, while a cross...
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A simultaneous analysis of several rotation functions allows identification of the model orientation in situations when a single rotation function fails to find the answer. Multiple rotation functions can be obtained by the usual modification of the search model or by variation of the resolution at which the function is calculated. A specially suitable case is a search with several NMR models. ...
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Landé factor Happ applied magnetic field (vector) Happ applied magnetic field (magnitude) Hm molecular field J exchange integral J total angular momentum k0 propagation vector l orbital quantum number l orbital momentum L orbital momentum L Langevin function m magnetic quantum number m0 measured magnetic moment at 0 K m magnetic moment ml orbital moment ms spin moment mz projection of m along H...
متن کاملQuasiperiodic Spin Space Groups
An outline is given of the spin space-group classi cation of quasiperiodic arrangements of spins. It is based on an extension to multicomponent quasiperiodic elds of the Fourierspace approach to crystal symmetry. The classi cation of decagonal spin space groups in two dimensions is given as an example. A group theoretic argument is given which is used to determine extinctions in a neutron di ra...
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ژورنال
عنوان ژورنال: Acta Crystallographica Section A
سال: 1980
ISSN: 0567-7394
DOI: 10.1107/s0567739480001854