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Availability of the New IR Grating (1Jun93)
(from NSO, NOAO Newsletter No. 34, 1 June 1993)

The dual-grating spectrometer (see December 1992 Newsletter) is up and running.
PHOTOMETRY, the data logging program, now has IR and visible options, allowing
one to switch grating constants.  Mechanical change-over requires just a few
minutes.  A quantitative evaluation in terms of efficiency, resolution, and
optimum order selection is still in progress, but the system is available for
use. To demonstrate the system capability at 4.6 um in the vicinity of the CO
lines, two spectrum scans taken in early March are reproduced: (a) a 4096 point
scan in the photosphere (disk center) and (b) a 1024 point scan in a sunspot
umbra.

Bill Livingston, Keith Pierce

                         [figures not included]

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