Unique variable line-space spectrometers on the EUVE satellite: in-flight performance and selected scientific results

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Abstract
Until recently, spectrometer designs for use at extreme ultraviolet wavelengths have been limited to grazing incidence Rowland spectrometers and transmission gratings. In principle, the new class of variable line-space spectrometers offer substantial advantages over these classic designs. The Extreme Ultraviolet Explorer Satellite has three variable line-space spectrometers as part of its scientific complement; this is the first use of this class of device. The results obtained have been quite noteworthy. The in-orbit performance of these spectrometers are demonstrated with examples of the scientific results obtained in this mission.

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