Request InfoMcPHERSONModel 234/302 from McPherson Inc. is a multipurpose vacuum-UV monochromator that can be fixed to an experiment or to the slit of a larger instrument for use as a predisperser or narrowband variable filter. An aberration-corrected grating produces an in-focus and flat focal plane. It can be used with microchannel plate or CCD detectors. The clean, contaminant-free finish enables rapid pump-down. The device is available as a double monochromator, in that units can be combined and operated with independent scanning drives. 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