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SAGE Publications, Applied Spectroscopy, 11(68), p. 1266-1273

DOI: 10.1366/14-07512

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

Journal article published in 2014 by Johannes Kiefer, Bo Zhou, Johan Zetterberg, Zhongshan Li ORCID, Marcus Alden
This paper is available in a repository.
This paper is available in a repository.

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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.