Stratospheric volume mixing ratio profile of chlorine nitrate (ClONO2) have been retrieved from 0.01-cm-1 resolution infrared solar occultation spectra recorded at latitudes between 14¿N and 54¿S by the atmospheric trace molecule spectroscopy Fourier transform spectrometer during the ATLAS 1 shuttle mission (March 24 to April 2, 1992). The results were obtained from nonlinear least squares fittings of the ClONO2 &ngr;4 band Q branch at 780.21 cm-1 with improved spectroscopic parameters generated on the basis of recent laboratory work. The individual profiles, which have an accuracy of about ¿20%, are compapred with previous observations and model calculations. ¿ American Geophysical Union 1994