Abstract
Two-photon excitation laser-induced fluorescence of carbon monoxide suffers
from interference from mainly C<sub>2</sub> and strong pressure quenching. This
paper presents an investigation of three excitation/detection schemes for two-photon
excitation laser-induced fluorescence on carbon monoxide. The schemes are evaluated
for pressure and quenching partner dependencies and C<sub>2</sub> interference.
Three different emission bands lie in the Hopefield-Birge system: The Ångström
B<sup>1</sup>Σ<sup>+</sup>→A<sup>1</sup>Π<sub>u</sub> band, with two-photon
excitation through B<sup>1</sup>Σ<sup>+</sup>←X<sup>1</sup>Π around 230 nm; the
Herzberg band C<sup>1</sup>Σ<sup>+</sup>→A<sup>1</sup>Π<sub>u</sub>, with two-photon
excitation through, C<sup>1</sup>Σ<sup>+</sup>←X<sup>1</sup>Π, around 217 nm; and
the third positive group b<sup>3</sup>Σ→a<sup>3</sup>Π, also with excitation of
B<sup>1</sup>Σ<sup>+</sup>←X<sup>1</sup>Π around 230 nm. The measurements are
performed in laminar premixed flames with various equivalence ratios as well as in a
high-pressure cell, where pressure and species concentrations are varied in order to
investigate the fluorescence quenching dependence.
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