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
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