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New Grating for CRSP (1Jun92)
(from KPNO, NOAO Newsletter No. 30, 1 June 1992)

The Cryogenic Spectrometer (CRSP) is a longslit IR spectrometer
utilizing a 58 x 62 InSb array for low and medium resolution
spectroscopy in the 1-5 um range. Thanks to the efforts of Gary Hill (U.
Texas), the useless grating #3 in CRSP has been replaced by one of
resolution intermediate between the high resolution grating #1 and the
low resolution grating #2. The new grating has 150 l/mm, blazed at 17.5
degrees, and yields a resolution/pixel of 0.004 m in the K-band. The
narrow blaze range limits efficient operation in the H band at m = 3 to
the short wavelength half of the band. This grating may be desirable
for observations of broad-lined objects for which spectral coverage is
preferred over resolution. This grating is permanently installed in
CRSP and is available to all observers. Particulars of the wavelength
settings and resolution are in the latest version (November 1991) of
the CRSP manual.

Dick Joyce

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