Changeset 4421 for trunk/GSASIIlattice.py
 Timestamp:
 May 16, 2020 8:55:12 AM (18 months ago)
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trunk/GSASIIlattice.py
r4415 r4421 19 19 The "*A* tensor" terms are defined as 20 20 :math:`A = (\\begin{matrix} G_{11} & G_{22} & G_{33} & 2G_{12} & 2G_{13} & 2G_{23}\\end{matrix})` and *A* can be used in this fashion: 21 :math:`d^* = \sqrt {A_ 1 h^2 + A_2 k^2 + A_3 l^2 + A_4 hk + A_5 hl + A_6kl}`, where21 :math:`d^* = \sqrt {A_0 h^2 + A_1 k^2 + A_2 l^2 + A_3 hk + A_4 hl + A_5 kl}`, where 22 22 *d* is the dspacing, and :math:`d^*` is the reciprocal lattice spacing, 23 :math:`Q = 2 \\pi d^* = 2 \\pi / d` 23 :math:`Q = 2 \\pi d^* = 2 \\pi / d`. 24 Note that GSASII variables ``p::Ai`` (``i``=0,1,...5) and ``p`` is a phase number are 25 used for the *Ai* values. See :func:`A2cell`, :func:`cell2A` for interconversion between A and 26 unit cell parameters; :func:`cell2Gmat` :func:`Gmat2cell` for G and cell parameters. 27 28 When the hydrostatic/elastic strain coefficients (*Dij*, :math:`D_{ij}`) are used, they are added to the 29 *A* tensor terms (Ai, :math:`A_{i}`) so that A is redefined 30 :math:`A = (\\begin{matrix} A_{0} + D_{11} & A_{1} + D_{22} & A_{2} + D_{33} & A_{3} + 2D_{12} & A_{4} + 2D_{13} & A_{5} + 2D_{23}\\end{matrix})`. See :func:`cellDijFill`. 31 Note that GSASII variables ``p:h:Dij`` (``i``,``j``=1,2,3) and ``p`` is a phase number 32 and ``h`` a histogram number are used for the *Dij* values. 24 33 ''' 25 34 ########### SVN repository information ###################
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