Index

Core dictionary version 3.3.0

_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 1.5.4.4 of
    International Tables for Crystallography Vol. A (2016) or
    a Hermann-Mauguin symbol for a conventional or unconventional
    setting.

    Each component of the space-group name is separated by a
    space or an underscore. The use of a 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, but not on the choice of origin. To
    define the setting uniquely use _space_group.name_Hall or
    list the symmetry operations.

    Reference: International Tables for Crystallography (2016). Volume A,
     Space-group symmetry, edited by M. I. Aroyo, 6th ed.
     Chichester: John Wiley & Sons.

Type: Text

Category:
space_group