MCS260
CORNERSTONE 260 MONOCHROMATORS
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10 COMMUNICATION METHODS
In order to satisfy the needs of as many users as possible, the Cornerstone 260 is designed to be
controlled from a variety of sources.
The Cornerstone 260 is capable of automatically controlling an optional filter wheel, Model 74010 . It is
also able to interface with the motorized filter wheel included with Oriel’s APEX2 light sources. These filter
wheels hold up to six 1-inch [25.4 mm] diameter filters. Neutral density filters can be used for intensity
adjustment. Order sorting filters may be installed to block higher order diffraction.
The filter wheel can be mounted to the male flanges of the monochromator slits or slit holders. The filters
are mounted external to the monochromator. Thus, the refractive index and thickness of the filters do not
significantly affect the focal distance to the collimating mirror inside the monochromator. With internal
filters, this distance would be different for every wavelength and every filter, and would therefore
adversely affect resolution. The Cornerstone 260 is designed and manufactured to have errors of only a
fraction of a millimeter in the focal distance. Positioning the filters externally, usually before the input slit,
has only a slight effect on the light throughput. Since the slit acts as a secondary source, the focal
distance is not affected.
Figure 25: Model 74010 Filter Wheel
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