Mid-infrared polarization spectroscopy of C2H2

Non-intrusive spatial-resolved measurements of polyatomic hydrocarbon molecules for combustion diagnostics

Z. S. Li, M. Linvin, J. Zetterberg, J. Kiefer, M. Alden

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

Polarization spectroscopy in the mid-infrared (IRPS) has been applied to the detection of acetylene molecules making use of the asymmetric C-H stretching vibration at around 3 mu m. The infrared laser pulses were produced through difference frequency generation in a LiNbO3 crystal pumped by a Nd:YAG and dye laser system. By directly probing the ro-vibrational transitions with IRPS, sensitive detection of molecules with otherwise inaccessible electronic states was realized with high temporal and spatial resolution by using a pulsed laser and a cross-beam geometry. Detection sensitivities of 2 x 10(13) molecules/cm(3) (10 ppm in 70 mbar gas mixture) of C2H2 were achieved using the P(11) line of the (010(11)(0))-(0000(0)0(0)) band. The dependence of the IRPS signal on the pump laser fluence, acetylene mole fraction, and buffer gas pressure of Ar, N-2, H-2, and CO2 has been studied experimentally. The investigation demonstrates the quantitative nature of IRPS for sensitive detection of polyatomic IR active molecules. In order to fully demonstrate the technique for combustion applications, nascent acetylene molecules were measured in a low pressure methane/oxygen flame. (C) 2006 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
Original languageEnglish
Pages (from-to)817-824
Number of pages8
JournalProceedings of the Combustion Institute
Volume31
Issue number1
Early online date18 Sep 2006
DOIs
Publication statusPublished - Jan 2007

Fingerprint

Hydrocarbons
hydrocarbons
Acetylene
Spectroscopy
Polarization
Infrared radiation
Molecules
acetylene
polarization
spectroscopy
molecules
Dye lasers
Infrared lasers
Methane
Electronic states
Pulsed lasers
temporal resolution
Gas mixtures
dye lasers
infrared lasers

Keywords

  • IRPS
  • C2H2
  • soot formation precursor
  • combustion intermediates
  • hydrocarbon detection

Cite this

Mid-infrared polarization spectroscopy of C2H2 : Non-intrusive spatial-resolved measurements of polyatomic hydrocarbon molecules for combustion diagnostics. / Li, Z. S.; Linvin, M.; Zetterberg, J.; Kiefer, J.; Alden, M.

In: Proceedings of the Combustion Institute, Vol. 31, No. 1, 01.2007, p. 817-824.

Research output: Contribution to journalArticle

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