Abstract
A simple interferometer placed in front of a liquid helium cooled grating instrument was constructed; we have attained a spectral resolution of ≳0.1 cm−1 in the wavelength range of ~64 cm−1 (157 μm) during observations from the NASA Kuiper Airborne Observatory. Spectra obtained on the planetary nebula NGC 7027 are shown.
© 1981 Optical Society of America
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