Absorption cross sections for the Ã				2A″ (0,90,0) ← 				2A′ (0,01,0) band of the HCO radical

Jonathan E. Flad; Steven S. Brown; James B. Burkholder; Harald Stark; A. R. Ravishankara

doi:10.1039/B607185F

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Absorption cross sections for the Ã ²A″ (0,9⁰,0) ← ²A′ (0,0¹,0) band of the HCO radical†

Jonathan E. Flad,^ab Steven S. Brown,*^a James B. Burkholder,^a Harald Stark^ab and A. R. Ravishankara^abc

Author affiliations

* Corresponding authors

^a NOAA Earth System Research Laboratory, Chemical Sciences Division, 325 Broadway, Boulder, USA
E-mail: steven.s.brown@noaa.gov

^b Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, USA

^c Department of Chemistry and Biochemistry, University of Colorado, Boulder, USA

Abstract

Absorption cross sections for the Ã ²A″ (0,9⁰,0) ← [X with combining tilde] ²A′ (0,0¹,0) band of HCO were determined at 295 K using pulsed laser photolysis combined with cavity ring-down spectroscopy. Formyl radicals (HCO) were produced from the reaction of atomic chlorine, generated by photolysis of Cl₂ at 335 nm, with formaldehyde. The concentration of HCO was calibrated using two independent photochemical methods. The peak cross section of the P(8) line was determined to be (1.98 ± 0.36) × 10⁻¹⁸ cm², and the intensity of the entire band was normalized to this line. The quoted 2σ uncertainty includes estimated systematic errors. Comparisons to previously reported values of HCO cross sections in this band are discussed.

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Absorption cross sections of the HCO radical PDF (50K)

Article information

DOI: https://doi.org/10.1039/B607185F
Article type: Paper
Submitted: 22 May 2006
Accepted: 19 Jun 2006
First published: 04 Jul 2006

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Phys. Chem. Chem. Phys., 2006,8, 3636-3642

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Absorption cross sections for the Ã ²A″ (0,9⁰,0) ← ²A′ (0,0¹,0) band of the HCO radical

J. E. Flad, S. S. Brown, J. B. Burkholder, H. Stark and A. R. Ravishankara, Phys. Chem. Chem. Phys., 2006, 8, 3636 DOI: 10.1039/B607185F

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