Abstract
The line shape profiles of the A ˜ 2 A ′ ← X ˜ 2 A ″ 000–000 band of hydroperoxy radical (HO 2) have been measured in the presence of nitrogen and water using laser photolysis/cw near infrared two-tone frequency modulation spectroscopy. On the basis of the theory described by Avetisov and Kauranen [Appl. Opt. 35 (1996) 4705], the absorption line shapes were well represented by the Voigt profile. The nitrogen- and water-broadening coefficients for the 7020.766 cm −1 16 1, 16 ← 16 0, 16 F 1 line of HO 2 were estimated to be 0.101 ± 0.013 and 0.216 ± 0.133 cm −1 atm −1, respectively. The large value of water-broadening coefficient suggests the long range interaction between HO 2 with water.
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