McPherson - 3-gratings for an optical spectrum from 8 to 2000 eV
Shallow 1.5 degree grazing incidence angle improves efficiency for high energy photons, wavelengths below 5 nanometers. Instrument now optimal for energies low as 8 eV (150 nanometers wavelength) and high as 2000 eV (0.6 nanometers).
