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Angle-dispersive diffractometer methods: conventional sources
Parrish, W., Wilson, A. J. C. and Langford, J. I.  International Tables for Crystallography (2006). Vol. C, Section 5.2.4, p. 495 [ doi:10.1107/97809553602060000596 ]
... the aberrations of the symmetrical diffractometer have been collected by Wilson (1961, 1963, 1965c, 1970a, 1974). For the Seemann-Bohlin type, they are collected in Table 5.2.4.1, mainly from Wilson (1974). They are expressed in inverse powers of the ... In the Seemann-Bohlin case, S will be constant at a value depending on the choice of angle , but usually ...

Extrapolation, graphical and analytical
Parrish, W., Wilson, A. J. C. and Langford, J. I.  International Tables for Crystallography (2006). Vol. C, Section 5.2.3.2, pp. 493-494 [ doi:10.1107/97809553602060000596 ]
... 5.2.3.2. Extrapolation, graphical and analytical Equation (5.2.1.4) indicates that for a given error in [theta] the fractional error in the spacing ... the simple cubic case, one can write where K is a proportionality factor and represents the angular variation of the systematic ... use of successive approximations it can be applied to hexagonal (Wilson & Lipson, 1941), tetragonal, and even orthorhombic materials. It is, ...
     [more results from section 5.2.3 in volume C]

Statistical fluctuations
Parrish, W., Wilson, A. J. C. and Langford, J. I.  International Tables for Crystallography (2006). Vol. C, Section 5.2.2.3, pp. 492-493 [ doi:10.1107/97809553602060000596 ]
... papers relevant to the problem are Mack & Spielberg (1958), Pike & Wilson (1959), Thomsen & Yap (1968a, b), Wilson (1965a, b, c, 1967, 1968, 1969, 1971), Wilson, Thomsen & Yap (1965), and ...
     [more results from section 5.2.2 in volume C]

Bragg angle: operational definitions
Parrish, W., Wilson, A. J. C. and Langford, J. I.  International Tables for Crystallography (2006). Vol. C, Section 5.2.1.4, pp. 491-492 [ doi:10.1107/97809553602060000596 ]
... definitions The Bragg angles are determined from the observations by a series of operations that are often quite complex. For film cameras of diameter 57.3 or 114.6mm, a simple measurement with a millimetre scale gives [theta] in degrees (1mm = 1 or ...
     [more results from section 5.2.1 in volume C]

X-ray diffraction methods: polycrystalline
Parrish, W., Wilson, A. J. C. and Langford, J. I.  International Tables for Crystallography (2006). Vol. C, ch. 5.2, pp. 491-504 [ doi:10.1107/97809553602060000596 ]
... More details of systematic errors in diffractometry are given in Wilson (1963, 1965c, 1974). Some general points on checking precision ... the purposes of this chapter is angle-dispersive diffractometry with a conventional tube source (1). Angle-dispersive diffractometry with synchrotron ... high pressures, ) can be achieved most readily by means of a fixed-angle diffractometer. Camera methods (4) are adaptable to ...

A priori predictions of molecular crystal structures
Wilson, A. J. C., Karen, V. L. and Mighell, A.  International Tables for Crystallography (2006). Vol. C, Section 9.7.8, p. 906 [ doi:10.1107/97809553602060000623 ]
A priori predictions of molecular crystal structures 9.7.8. A priori predictions of molecular crystal structures As physical properties of a molecular compound are a function of the spatial arrangement ...

The hydrogen bond and the definition of the packing units
Wilson, A. J. C., Karen, V. L. and Mighell, A.  International Tables for Crystallography (2006). Vol. C, Section 9.7.7.2, p. 906 [ doi:10.1107/97809553602060000623 ]
... not necessarily identical with the individual molecule. The molecule (of a shape defined by chemical bonds on the inside and van ... two hydrogen bonds and two regular O-H bonds create a point symmetry at each O atom, and a highly symmetrical structure emerges with an infinite bond network, ...
     [more results from section 9.7.7 in volume C]

A statistical model
Wilson, A. J. C., Karen, V. L. and Mighell, A.  International Tables for Crystallography (2006). Vol. C, Section 9.7.6, p. 904 [ doi:10.1107/97809553602060000623 ]
A statistical model 9.7.6. A statistical model Wilson (1988, 1990, 1991) has discussed the factors that, on ...

Structural classes
Wilson, A. J. C., Karen, V. L. and Mighell, A.  International Tables for Crystallography (2006). Vol. C, Section 9.7.5, p. 904 [ doi:10.1107/97809553602060000623 ]
... all molecules are the same. Nevertheless, they are important in a study of the space-group distribution of molecular organic structures ... by molecular symmetry. In its general form, the symbol of a structural class has the form where is the standard space ... those symmetries. An example will make this clearer. There is a structural class This indicates that the space group is ...

Positions with the full symmetry of the geometric class
Wilson, A. J. C., Karen, V. L. and Mighell, A.  International Tables for Crystallography (2006). Vol. C, Section 9.7.4.4, pp. 903-904 [ doi:10.1107/97809553602060000623 ]
... of the geometric class The symmorphic space groups are in a one-to-one correspondence with the arithmetic crystal classes, and ... I4 1 None P4/n 1 P42/n 3 I41/a 12 P21c 17 I2d 1 I41/acd 1 4/m ... molecules of these symmetries in space groups of higher symmetry. A few are in fact to be found in non- ...
     [more results from section 9.7.4 in volume C]

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