Tunable diode laser measurements of CH 3 OOH absorption cross‐sections near 1320 CM −1

Infrared absorption spectra and absorption cross‐sections in the C‐H deformation band of CH 3 OOH near 1320 cm −1 have been measured with a tunable diode laser spectrometer. Methylhydroperoxide concentrations in a slowly flowing gas mixture were determined by UV absorption. Peak absorption cross‐sections of the strongest lines observed were found to lie in the range (0.5 –1.5) × 10 −18 cm² under near Doppler‐limited conditions. The dependence of the peak absorption cross‐sections on total air pressure in the range 2.5–90 torr was also investigated, and the possibility of CH 3 OOH atmospheric mixing ratio measurement with a tunable diode laser assessed.