. - ht , ensities of the IW ’ 7 cm - l ( V 3 ) band of HONG and feasibility of atmospheric detection

Absorption coefficients of the 1397 cm-l, V3, band of peroxynitric acid (H02N02) have been measured at 225-230 K in order to calculate the feasibility of detecting this spectral feature in atmospheric spectra. High-resolution (0.0078 cm-l) Fourier transform spectra (13701430 cm-l) of low pressure gas-mixtures containing H02N02 were analyzed to determine the absorption coefficient, k(v). The maximum absorption coefficient was found to be 1.0 x 1O-18 cmVmolec at the peak of the 1397 cm-l Q-branch. An average pressure broadening coefficient of 0.1 (iO.02) cm-Vatm was also measured using a tunable diode laser spectrometer (resolution 0.001 cm-l) and a convolution technique. The high resolution spectrum and pressure broadening coefficient were used to simulate the atmospheric transmission spectrum at an altitude where H02N02 is expected to have it’s peak in the vertical concentration profile (27 km).