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Measurement of CrO in flames by cavity ringdown spectroscopy

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Abstract

CrO is an important intermediate in the high temperature oxidation chemistry of chromium containing species. This work reports the first detection of CrO in a flame. The B 5Π-X 5Π electronic transition was probed by cavity ringdown spectroscopy (CRDS) in a lean (ϕ=0.38), low-pressure, flat, laminar hydrogen-oxygen-argon flame seeded with Cr(CO)6. The previous B 5Π-X 5Π CrO spectrum of Hocking et al. (605.0 nm-606.5 nm) is extended from the band head located at 605.6 nm to 614.4 nm. The temperature profiles of the doped and undoped flames were obtained from measurements of OH laser- induced fluorescence. Seeding the flame with Cr(CO)6 increased the flame temperature by approximately 150 K. The concentration profile of CrO was measured as a function of height above the burner. CrO absorption signals were converted to concentration using the measured temperature profile and absorption cross-section calculated from lifetimes by Hedgecock et al. A lower limit peak CrO concentration of 1.6 ppb was found in the flame. Some uncertainty in the cross-section remains. Comparisons to calculations using STANJAN indicate that CrO is present in flames at super equilibrium concentrations.

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Authors and Affiliations

  1. Department of Mechanical and Aeronautical Engineering, University of California, 95616, Davis, CA, USA

    B.P. Wilcox & I.M. Kennedy

  2. Sandia National Laboratories, MS 9051, 94551–0969, Livermore, CA, USA

    E.T.H. Chrysostom & A. McIlroy

  3. Department of Mechanical Engineering, University of Colorado, 80309–0427, Boulder, CO, USA

    J.W. Daily

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  1. B.P. Wilcox
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  2. E.T.H. Chrysostom
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  3. A. McIlroy
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  4. J.W. Daily
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  5. I.M. Kennedy
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Correspondence to A. McIlroy.

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PACS

82.33.Vx; 42.62.Fi

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Wilcox, B., Chrysostom, E., McIlroy, A. et al. Measurement of CrO in flames by cavity ringdown spectroscopy. Appl Phys B 77, 535–540 (2003). https://doi.org/10.1007/s00340-003-1275-7

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  • DOI: https://doi.org/10.1007/s00340-003-1275-7

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