The 9030DA double additive monochromator consists of two 9030 monochromators placed in series. Stray light is drastically reduced in a double monochromator, and  in the 9030DA or DS it is further minimized by the use of concave holographic gratings. The inbound light is dispersed by the first grating and again by the second. Both gratings rotate simultaneously in the same direction, and in the DA the monochromators are coupled so that the dispersion is double that of a single 9030 monochromator. Bandpass is half of the corresponding 9030 monochromator for the same output slit, and resolution using a 100 µm slit is 0.4 nm.
 The 9030DA is a fully integrated unit with the two diffraction gratings mechanically connected for accurate positioning. The standard monochromator setup includes 0.25 mm fixed, straight input and output slits and a 1 mm intermediate slit, as well as two gratings chosen to suit the customer’s needs. The 9030DA can be motorized with the Sciencetech MD100 stepper motor and drive system. Only one motor and one drive system is required, enabling control via user-friendly software provided by Sciencetech.