Measurement of CrO in flames by cavity ringdown spectroscopy

B. P. Wilcox, E. T H Chrysostom, A. McIlroy, J. W. Daily, I. M. Kennedy

Research output: Contribution to journalArticle

5 Citations (Scopus)

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 B5π-X5π 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 B5π - X5π 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.

Original languageEnglish (US)
Pages (from-to)535-540
Number of pages6
JournalApplied Physics B: Lasers and Optics
Volume77
Issue number5
DOIs
StatePublished - Oct 2003

Fingerprint

flames
cavities
spectroscopy
temperature profiles
flame temperature
burners
inoculation
laser induced fluorescence
absorption cross sections
chromium
low pressure
argon
chemistry
life (durability)
oxidation
cross sections
oxygen
hydrogen
profiles
electronics

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Physics and Astronomy (miscellaneous)

Cite this

Wilcox, B. P., Chrysostom, E. T. H., McIlroy, A., Daily, J. W., & Kennedy, I. M. (2003). Measurement of CrO in flames by cavity ringdown spectroscopy. Applied Physics B: Lasers and Optics, 77(5), 535-540. https://doi.org/10.1007/s00340-003-1275-7

Measurement of CrO in flames by cavity ringdown spectroscopy. / Wilcox, B. P.; Chrysostom, E. T H; McIlroy, A.; Daily, J. W.; Kennedy, I. M.

In: Applied Physics B: Lasers and Optics, Vol. 77, No. 5, 10.2003, p. 535-540.

Research output: Contribution to journalArticle

Wilcox, BP, Chrysostom, ETH, McIlroy, A, Daily, JW & Kennedy, IM 2003, 'Measurement of CrO in flames by cavity ringdown spectroscopy', Applied Physics B: Lasers and Optics, vol. 77, no. 5, pp. 535-540. https://doi.org/10.1007/s00340-003-1275-7
Wilcox, B. P. ; Chrysostom, E. T H ; McIlroy, A. ; Daily, J. W. ; Kennedy, I. M. / Measurement of CrO in flames by cavity ringdown spectroscopy. In: Applied Physics B: Lasers and Optics. 2003 ; Vol. 77, No. 5. pp. 535-540.
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