4 MICRON HIGH-RESOLUTION SPECTRA OF JUPITER IN THE NORTH EQUATORIAL BELT - H-3-12 C-13 RATIO( EMISSIONS AND THE C)

Spectra of the North Equatorial Belt of Jupiter were obtained in March 1992 at an unapodized resolution of 0.1 cm-1 between 2450 and 2600 cm -1 with the Fourier Transform Spectrometer at the 3.6 m Canada-France- Hawaii Telescope on Mauna Kea. Several emissions from the nu2 band of H-3(+) were detected. The excitation temperature derived from the rela tive intensities of these emissions averaged over a wide range of long itudes is 800 +/- 100 K, and the H-3(+) column density is 1.56(-0.5)+1 .0 x 10(11) cm-2. In addition, several strong absorption features due to 13CH4 were observed. A comparison between 12CH4 and 13CH4 absorptio ns allowed us to obtain a new measurement of the C-12/C-13 ratio. We f ound that this ratio, estimated for the first time in this spectral ra nge, is 89 (+/-25), in agreement with the terrestrial value.