 Timestamp:
 Jun 8, 2021 9:20:20 AM (4 months ago)
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trunk/GSASIIobj.py
r4878 r4924 1122 1122 The coordinate system used for texture characterization is defined where 1123 1123 the sample coordinates (Psi, gamma) are defined with an instrument coordinate 1124 system (I, J, K) such that Iis normal to the diffraction plane and J is coincident with the1125 direction of the incident radiation beam pointing away fromthe source. We further define1124 system (I, J, K) such that K is normal to the diffraction plane and J is coincident with the 1125 direction of the incident radiation beam toward the source. We further define 1126 1126 a standard set of righthanded 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 sample1127 rotations about K and Chi is a rotation about J when Omega = 0. Finally, as the sample 1128 1128 may be mounted so that the sample coordinate system (Is, Js, Ks) does not coincide with 1129 1129 the instrument coordinate system (I, J, K), we define three eulerian sample rotation angles 1130 (Omegas, Chis, Phis) that describe the rotation from (I , J, K) to (Is, Js, Ks). The sample rotation1130 (Omegas, Chis, Phis) that describe the rotation from (Is, Js, Ks) to (I, J, K). The sample rotation 1131 1131 angles are defined so that with the goniometer angles at zero Omegas and Phis are rotations 1132 about Iand Chis is a rotation about J.1132 about K and Chis is a rotation about J. 1133 1133 1134 1134 ISODISTORT implementation
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