Changeset 4924


Ignore:
Timestamp:
Jun 8, 2021 9:20:20 AM (4 months ago)
Author:
vondreele
Message:

fix texture coordinate system description

File:
1 edited

Legend:

Unmodified
Added
Removed
  • trunk/GSASIIobj.py

    r4878 r4924  
    11221122The coordinate system used for texture characterization is defined where
    11231123the sample coordinates (Psi, gamma) are defined with an instrument coordinate
    1124 system (I, J, K) such that I is normal to the diffraction plane and J is coincident with the
    1125 direction of the incident radiation beam pointing away from the source. We further define
     1124system (I, J, K) such that K is normal to the diffraction plane and J is coincident with the
     1125direction of the incident radiation beam toward the source. We further define
    11261126a standard set of right-handed goniometer eulerian angles (Omega, Chi, Phi) so that Omega and Phi are
    1127 rotations about I and Chi is a rotation about J when Omega, Chi, Phi = 0. Finally, as the sample
     1127rotations about K and Chi is a rotation about J when Omega = 0. Finally, as the sample
    11281128may be mounted so that the sample coordinate system (Is, Js, Ks) does not coincide with
    11291129the instrument coordinate system (I, J, K), we define three eulerian sample rotation angles
    1130 (Omega-s, Chi-s, Phi-s) that describe the rotation from (I, J, K) to (Is, Js, Ks). The sample rotation
     1130(Omega-s, Chi-s, Phi-s) that describe the rotation from (Is, Js, Ks) to (I, J, K). The sample rotation
    11311131angles are defined so that with the goniometer angles at zero Omega-s and Phi-s are rotations
    1132 about I and Chi-s is a rotation about J.
     1132about K and Chi-s is a rotation about J.
    11331133
    11341134ISODISTORT implementation
Note: See TracChangeset for help on using the changeset viewer.