High-quality metrology with synchrotron radiation requires in particular a very high spectral purity of the incident beam. This is usually achieved by a set of transmission filters with suitable absorption edges to suppress high-order radiation of the monochromator. The at-wavelength metrology station at a BESSY-II bending-magnet collimated plane-grating monochromator (c-PGM) beamline has recen...

Abstract The application of a deformable grating to the realization time delay compensated monochromator is presented. realized as replica on thin glass substrate and deformation with mechanical bender. conceived for spectral selection single harmonic in range 20-80 nm beamlines exploiting high generation process. A possible optical design requiring only two gratings, mirror an intermediate slit

Abstract. During the 2019/2020 measurement campaign at Hohenpeißenberg (Germany) and Davos (Switzerland) we compared well-established Dobson Brewer spectrometers (single- double-monochromator Brewer) with newer BTS array-spectroradiometer-based systems in terms of total ozone column (TOC) determination. The aim this study is to validate performance a longer-term TOC analysis over more than 1 ye...