Laser-Induced Fluorescence Detection of Hot Molecular Oxygen in Flames Using an Alexandrite Laser

Johannes Kiefer, Bo Zhou, Johan Zetterberg, Zhongshan Li, Marcus Alden

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Abstract

The use of an alexandrite laser for laser-induced fluorescence (LIF) spectroscopy and imaging of molecular oxygen in thermally excited vibrational states is demonstrated. The laser radiation after the third harmonic generation was used to excite the B-X (0-7) band at 257 nm in the Schumann-Runge system of oxygen. LIF emission was detected between 270 and 380 nm, revealing distinct bands of the transitions from B(0) to highly excited vibrational states in the electronic ground state, X (v > 7). At higher spectral resolution, these bands reveal the common P- and R-branch line splitting. Eventually, the proposed LIF approach was used for single-shot imaging of the two-dimensional distribution of hot oxygen molecules in flames.
Original languageEnglish
Pages (from-to)1266-1273
Number of pages8
JournalApplied Spectroscopy
Volume68
Issue number11
DOIs
Publication statusPublished - 1 Nov 2014

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Keywords

  • Schumann-Runge
  • Oxygen
  • Ultraviolet
  • Planar laser-induced fluorescence
  • PLIF

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