A polychromator for (S)EXAFS using a laser generated plasma as soft X-ray source

Abstract A grating polychromator of novel design is presented. The design consists of a toroidal mirror and a concave grating and is intended for use in a SEXAFS experiment with use of a laser generated plasma soft X-ray source. The spectral range from 200 eV to 800 eV is dispersed on a 30 mm long, 5 mm high target. The resolution is measured to have a value of approximately 6 eV over the whole spectral range, as was predicted theoretically. The acceptance angle of the system is 2 × 10 −5 sr.