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SMV file format: Difference between revisions
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Number of possible beam center conventions is 4 * 2 = 8.
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m (Number of possible beam center conventions is 4 * 2 = 8.) |
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* OSC_RANGE - change in value of spindle rotation motor for this image. | * OSC_RANGE - change in value of spindle rotation motor for this image. | ||
* WAVELENGTH - X-ray wavelength used to obtain this image. All known SMV file formats give this in Angstrom. | * WAVELENGTH - X-ray wavelength used to obtain this image. All known SMV file formats give this in Angstrom. | ||
* BEAM_CENTER_X - position on the detector face that would be hit by the direct x-ray beam if the beamstop were removed. Most beamlines give this in millimeters, but some at ESRF give it in pixel units. Unfortunately, there are also | * BEAM_CENTER_X - position on the detector face that would be hit by the direct x-ray beam if the beamstop were removed. Most beamlines give this in millimeters, but some at ESRF give it in pixel units. Unfortunately, there are also eight possible conventions for representing the beam center (four corners to use as 0,0, and two axes to assign to either "X" or "Y"), and nearly all of these are used by one program or another. At the Advanced Light Source and Stanford Synchrotron Radiation Lab these values are such as to give the correct beam center display in the program ADXV (provided by ADSC). | ||
* DENZO_X_BEAM - introduced at the Advanced Light Source to indicate the direct beam position to enter into the data processing program denzo or mosflm, as these programs coincidentally use the same beam center convention. This was an attempt to avoid confusion by specifying the convention explicitly. | * DENZO_X_BEAM - introduced at the Advanced Light Source to indicate the direct beam position to enter into the data processing program denzo or mosflm, as these programs coincidentally use the same beam center convention. This was an attempt to avoid confusion by specifying the convention explicitly. | ||
== See also == | == See also == | ||
[[Crystallographic data file formats]] | [[Crystallographic data file formats]] | ||