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

<strong>Tecnai</strong> on-line help Options 96Options Software version 2is taken up by giving the secondary zone axis some freedom to move (along the line connecting the twozone axes). Such differences can occur because of the accuracy of the measurement of the stageposition, including the effects of backlash on the tilts (which may result in deviations up to 0.2° or so) orbecause the crystal is bent and the second zone axis orientation was not determined from the exactsame place in the crystal.CancelPressing Cancel exits from the Two-zone indexing dialog, while leaving the orientation as it was.7.5.2 Zone axis calculator dialogWhen one of the Calculator buttons is pressed, the software brings up the Zone axis calculator dialog:MeasurementThe Zone Axis Calculator can use the same method for measuring in diffraction as the standardMeasuring control panel. Please see the description there as to the execution of such measurements.The results of the measurements are automatically inserted into the edit controls for d1, d2 and theinterplanar angle.d1d1 is the first d-spacing used for indexing of the zone axis. The value for the d-spacing (in nanometers)can be determined with the on-line measurement or entered by hand.d2d2 is the second d-spacing used for indexing of the zone axis. The value for the d-spacing (innanometers) can be determined with the on-line measurement or entered by hand.RatioWhen Calculate is pressed, the ratio between the two d-spacings as measured is calculated. This valuecan be compared to the calculated value.