Index

Core dictionary version 3.0.14

_space_group.name_H-M_alt

Definition:

   
     _space_group.name_H-M_alt allows for any Hermann-Mauguin symbol
     to be given. The way in which this item is used is determined
     by the user and in general is not intended to be interpreted by
     computer. It may, for example, be used to give one of the
     extended Hermann-Mauguin symbols given in Table 4.3.1 of
     International Tables for Crystallography Vol. A (1995) or
     a Hermann-Mauguin symbol for a conventional or unconventional
     setting.
     Each component of the space group name is separated by a
     space or underscore. The use of space is strongly
     recommended. The underscore is only retained because it
     was used in earlier archived files. It should not be
     used in new CIFs. Subscripts should appear without special
     symbols. Bars should be given as negative signs before the
     numbers to which they apply.
     The commonly used Hermann-Mauguin symbol determines the space
     group type uniquely but a given space group type may be
     described by more than one Hermann-Mauguin symbol. The space
     group type is best described using _space_group.IT_number.
     The Hermann-Mauguin symbol may contain information on the
     choice of basis though not on the choice of origin. To
     define the setting uniquely use _space_group.name_Hall or
     list the symmetry operations.

Type: Text

Category:
space_group