Compaq Graphical User Interface mar345 - Manual (Page 33)

mar345 Program Manual 3 3
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The plot area of the window shows the following features:
Vertical axis Interpolated intensities
Upper horizontal axis Length of line in pixel units.
Lower horizontal axis Length of line in mm units.
Left dashed red line Marks the begginning of a measured distance. This line can be
moved using the left mouse button.
Right dashed red line Marks the begginning of a measured distance. This line can be
moved using the right mouse button.
Horizontal red lines Shows the length of the line in pixels (mm) and the distance
between the dashed vertical lines.
The pointer can be used to measure distances by setting the red dashed lines to the desired
position along the drawn line. This is particularly useful if you want to measure cell constants.
The program features a peak finding algorithm which tries to set the bars on top of the first
and the last peak of the plot. In between the peaks the program then looks for other peaks
and tries to calculate the best inter−peak distances by assuming a harmonic oscillation. The
no. of peaks calculated by the program is displayed in the "No. of peaks" text field. Of course,
this value may be modified. The derived cell constants do not take into account any particular
setting or symmetry of the crystal but calculates cell constants assuming plain orthogonal
axes in reciprocal space.