Tecnai on-line help manual -- Options - UT Southwestern

<strong>Tecnai</strong> on-line help Options 102Options Software version 2• If it is required to display the diffraction pattern for the select one axis, Press View Pattern for theSecondary zone axis.The Two-Zone Indexing dialogdisplaying the diffractionpattern for the 02-1 zone axis.• If necessary, change the selected primary and secondary zone axes.• Press Index and the orientation of the crystal in the k-Space display will be changed to the orientationestablished.If necessary, it is possible to refine the orientation by using the k-Space display to tilt to a more suitablezone axis, storing the relevant zone axis through the Stage Control Panel, then re-entering the Two-Zone Indexing dialog and either replacing one or both the existing zone axes in the existing zonememories or changing to different zone memories and storing the results of the new zone axes there.7.7 Manual indexingThe manual indexing requires setting the crystal to a known zone axis and identifying a g vector (indicesof the diffraction spot). The direction of this g vector is defined relative to the zero-offset angle which inturn is defined by the top of the display (north). Negative crystallographic indices can be set by using thespecial keyboard keys.