Output diagnostics of the grazing incidence plane grating monochromator bumble bee (15–1500 eV)☆

The Bumble Bee is a bakeable UHV compatible plane grating monochromator with a fixed exit beam and the capability to suppress higher order radiation in a wide energy range. The instrument was built to be used in connection with UHV reflectometer and has a differential pumping section between the optical components and the sample allowing a pressure of 10−5 Torr in the experimental chamber without influencing the UHV in the monochromator. The monochromator is not optimized for resolution. Due to its location at a beamline with a short source distance we achieve only medium resolving power in the order of E/ΔE ≈ 200. The primary goal is the suppression of higher orders, fortunately the thus selected operating parameters for the coupled rotations of the optical components also give nearly the highest available output. The instrument is characterized in great detail. The performance of the instrument is discussed and compared with extensive theoretical calculations.

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