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The vertical profile and total column concentration of HCl have been measured from ground based high resolution infrared absorption spectra. The lines recorded were the R1 and P5 of HCl35 at 2942.731 cm−1 and 2775.760 cm−1 respectively. Vertical profiles and column concentrations are reported for different seasons. Measurements indicate an HCl volume mixing ratio equal to (2.2 ± 0.5) × 10−11 at 10 km increasing to (3.4 ± 0.6) × 10−9 at 33 km.

Formaldehyde, H/sub 2/CO, has been detected in the atmosphere at 2807 and 2869 cm/sup -1/ using high resolution infrared absorption spectroscopy from a ground based station. An order of magnitude measure of the column concentration (5 x 10/sup 15/ molecules per cm/sup 2/) is given, and an estimate of the trospospheric and stratospheric concentrations is derived from the line pressure broadening.