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Air-Broadened Linewidth Measurements in the ν2 Vibrational Band of the Hydroperoxyl Radical

✍ Scribed by D.D. Nelson; M.S. Zahniser

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
375 KB
Volume
166
Category
Article
ISSN
0022-2852

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✦ Synopsis

We have measured the air-broadening coefficient for one of the strongest infrared absorption lines of the hydroperoxyl radical-the (9_{19} \leftarrow 8_{18} F_{1}, F_{2}) doublet of the (\nu_{2}) band at (1411.18 \mathrm{~cm}^{-1}). We obtain a value of (b=0.107 \pm 0.009 \mathrm{~cm}^{-1} \mathrm{~atm}^{-1}) ( half-width at half-maximum) for the Lorentz broadening caused by air at (296 \mathrm{~K}). This measurement was made using a high-resolution tunable diode laser. The (\mathrm{HO}{2}) was made at atmospheric pressure from the (\mathrm{H}+\mathrm{O}{2}) association reaction. The (\mathrm{HO}_{2}) was sampled by a fast-flow reduced-pressure multipass absorption cell using an astigmatic off-axis resonator. The optical path length was (100 \mathrm{~m}) with 182 passes. The results of this measurement are essential for the design and implementation of several atmospheric hydroperoxyl monitoring schemes. ic 1994 Academic Press. Inc.

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