bisecting: Make an image showing a particular reflection
The "bisecting" program can collect a single image or a series of
images with a specified reflection at the center. It normally makes an
omega scan through the reflection, but can also be instructed to make
an additional chi movement to get a good idea of the rotation-profile
of the reflection.
Usage
The program is invoked by the command line:
bisecting [options] [.x or .rmat file]
One ".x" or ".rmat" file should be given to enable the program to find
the orientation matrix for the crystal. If none is specified, the program
will read the most recent ".rmat" file from the current directory, or,
if none such file exists, it will read the most recent ".x" file to get
the orientation matrix.
The program accepts all options for controlling the way the unit cell is treated, plus:
- hkl=h,k,l
-
Specifies a reflection to look at. Multiple reflections
can be given, the scan will be repeated for each reflection.
- omega=scanangle
-
Specifies the total omega scan angle in degrees. Default "omega=2.0".
- phi=scanangle
-
Specifies the total phi scan angle in degrees. Default "phi=0.0".
- chi=scanangle
-
Specifies the chi scan angle in degrees. Default "chi=0.0".
- psi=angle
-
Specifies the psi angle for the reflection in degrees. Default
"psi=0.0". Other psi's will have higher kappa angles.
- psihkl=h2,k2,l2
-
Specifies that the psi angle for the h,k,l reflection should be chosen
such that h2,k2,l2 is diffracting at the same time. This can be used
to study double diffraction phenomena.
- dx=dx
-
Specifies the distance at which the image is to be made. Default
"dx=165".
- frametime=seconds
-
Specifies the time to spend measuring the frame (a double image is
made, so the measurement will take double the specified
time). Default "frametime=10".
- n=n
-
Specifies the number of slices to make. Default "n=1".
- negativetheta/positivetheta
-
Prefer negative or positive theta setting if possible.
The measured frames will be stored in the files "x##f###.kcd",
starting from the first scan number for which the "x##f001.kcd" file
does not exist on disk.
