Determination of gas-phase absorption cross-sections of FeO in a shock tube using intracavity absorption spectroscopy near 611 nm

Peter Fjodorow, Matthieu R. Lalanne, Dong He, Monika Nanjaiah, Anita Pilipodi-Best, Valery M. Baev, Sergey Cheskis, Jürgen Herzler, Mustapha Fikri, Irenäus Wlokas, Christof Schulz, Igor Rahinov

Research output: Contribution to journalConference articlepeer-review

Abstract

We report state-resolved absorption cross-section measurement and oscillator-strength evaluation of the gas-phase iron oxide (FeO) orange system near 611 nm. Intracavity absorption spectroscopy (ICAS) with a homemade broadband dye laser was applied for time-resolved measurements of absorption spectra of shock-activated mixtures of iron pentacarbonyl and carbon dioxide (diluted in argon), generating gas-phase FeO. The measurements were performed with a time resolution of 170 μs in the spectral range of 16,316-16,353 cm-1 that includes a large number of FeO absorption lines. Across the 8-cm diameter of the shock tube, ICAS leads to an effective absorption path length of 260 m. Absorption cross-section values of 0.5 × 10-18-4 × 10-18 cm2 were determined for temperatures around 2200 K and pressures of ∼1.3 bar. Pressure- and temperature-independent oscillator strengths for individual ro-vibronic transitions within the 611-nm band of FeO orange system are reported for the first time. These data are generally applicable for quantitative absorption measurements of flame studies of iron chemistry, where FeO plays a key role as intermediate species.

Original languageEnglish
Pages (from-to)1637-1645
Number of pages9
JournalProceedings of the Combustion Institute
Volume38
Issue number1
DOIs
StatePublished - 2021
Event38th International Symposium on Combustion, 2021 - Adelaide, Australia
Duration: 24 Jan 202129 Jan 2021

Keywords

  • ARAS
  • FeO
  • ICAS
  • Oscillator strength
  • Shock-tube

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