Powder plot

Powder plot#

A powder plot represents the intensity as a function of the q vector, defined as \(q=\sqrt{q_{xy}^2+q_z^2}\). This allows for comparison with powder diffractograms obtained from other sources.

Generate the powder plot#

  1. Select the Image: Choose the merged image of scans 5151 and 5152.

  2. Open LineScan: Click on the LINE icon (LineScan over whole image). This opens the Powder Plot window.

Configure the plot#

  • Binning: Adjust the binning by changing the number of x-axis data points. For consistency across comparisons, it’s recommended to leave this setting unchanged.

  • Units: Choose to display the data as a function of either \(q\) or \(2\theta\). Selecting \(2\theta\) is particularly useful when comparing with powder diffractograms obtained using the Cu K\(\rm \alpha\)1 X-ray emission line.

  • Data Selection: Focus on data points with \(q_z > 0\) and \(q_{xy} < 0\) to:

    • Maintain resolution in \(q_{xy}\).

    • Prevent peak splitting if the direct beam isn’t perfectly centered at \(q_{xy} = 0\).

Analyze or export the plot#

  • Fitting: GIDVis provides tools to fit the peak positions. However, you may find it easier to export the data and analyze it using your preferred fitting software.

  • Export Data:

    1. Click on File > Export Line Data....

    2. Select Export and Close.

The exported text file contains the powder plot data in a two-column format, suitable for further analysis.

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