Air-broadening coefficients of the HO2 radical in the 2ν1 band measured using cw-CRDS |
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| Authors: | Nofal Ibrahim Jerome Thiebaud Christa Fittschen |
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| Institution: | a Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA), CNRS UMR 7583, Universités de Paris-7 et -12 94010 Créteil Cedex, France
b Physico-Chimie des Processus de Combustion et de l’Atmosphère (PC2A), CNRS UMR 8522, Université des Sciences et Technologies de Lille, 59655 Villeneuve d’Ascq Cedex, France |
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| Abstract: | In this paper we present measurements of the air-broadening coefficients of HO2 at room temperature in the 2ν1 band around 1.5 microns. The HO2 radicals were created by flash photolysis of SOCl2 in a flow of O2/CH3OH mixtures. To observe air-broadening, N2 (79%) and O2 (21%) were added using calibrated flow controllers and a total pressure controller. The total pressure was monitored in parallel using a capacitive pressure gauge. Air-broadening coefficients at 296 K were determined for 34 absorption lines between 6631 and 6671 cm−1. The air-broadening coefficients of HO2 show a rotational dependence (decreasing from about 0.14 cm−1/atm for N″ = 3 to about 0.09 cm−1/atm for N″ = 10). No evidence for collisional narrowing was observed. |
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| Keywords: | HO2 Infrared CRDS Pressure-broadening Air-broadening |
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