Abstract

Of seven very high resolution spectrometers in the United States and Japan, two utilize electron storage ring light sources and provide photoelectric scanning of the vacuum ultraviolet spectrum.¹ These are the 6.65 m off-plane Eagle instrument connected to the Synchrotron Ultraviolet Radiation Facility storage ring at the National Institute of Standards and Technology (NIST)^2,3 in Gaithersburg, Maryland, and the other is a similar instrument connected to the synchrotron at the Photon Factory in Tsukuba, Japan. The NIST spectrometer (Fig. 1) uses a 4800 l/mm gold-coated spherical mirror grating blazed at 900 Å with a radius of curvature of 6.65 m and a ruled area of 125 mm × 110 mm. The spectrometer uses this grating in the first order and at present has a full width half maximum resolution of ~10m Å and uses horizontal slits.

© 1993 Optical Society of America