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spoton: Follow a reflection over the detector

The "spoton" program can measure a single reflection at different positions of the CCD detector, to make a verification of the sensitivity correction.

Usage

The program is invoked by the command line:

  spoton [xfilename] [options]

The xfilename given should point to a file containing an orientation matrix. If none is given, the newest ".rmat" or the newest ".x" file from the current directory is used.

Options

hkl=[reflection]: Selects a particular reflection for following. If no reflection is specified, the program will look for a suitable reflection for the measurement.
dx=[distance]: The detector to crystal distance at which the experiment is to be performed. Default=50mm.
frameangle=[frameangle]: The width of the frames to be collected. Default=0.5 degrees.
frametime=[frametime]: The data collection time per frame. Default=10 seconds, or whatever time looks good after having performed a pre-frame.
preframetime=[preframetime]: The data collection time for the test frame. Default=2 seconds.
n=#: Number of positions for the reflection on the screen. Default=40.
negativetheta: Specifies that the negative theta impact of the reflection should be used. This is the default if the goniostat has more space at negative theta than at positive theta.
positivetheta: Specifies that the positive theta impact of the reflection should be used. This is the default if the goniostat has more space at positive theta than at negative theta.
make: If "make" is specified, and no hkl is given on the command line, the program will figure out a good hkl and exposure time by itself, and then run itself in a subdirectory "near" (at dx=30 or any other specified dx) and a second time in a subdirectory "far" (at 4 times as large dx value). It will also store the "hkl" and "frametime" arguments used in the "spoton.args" file. These are the ideal conditions for the spoton-integrate program.

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