FTS atmospheric transmission measurements and observations of planetary atmospheres

The shearing-interferometer originally designed for CSO surface measurements (Serabyn, Masson & Phillips 1991) has been upgraded to operate as a moderate resolution Fourier Transform Spectrometer. With a maximim one-sided travel of 44 cm, the attainable unapodized spectral resolution is 170 MHz. Used with the CSO facility holometric detector, the range of applicability of this FTS is 150-1000 GHz. This instrument has now been used for observations of the transmission of the Earth's atmosphere above Mauna Kea, as well as observations of planetary spectra in the millimeter/submillimeter wavelength ranges. We present a few prefiminary results here