Abstract

Laser-induced fluorescence (LIF) and two-dimensional laser-induced fluorescence were used for measurement of the fluorescence lifetime of the $A{}^1\mathrm{\Sigma }^{+}$ state of BaO molecules in the laser-ablation process of ${\mathrm{BaTiO}}_3$ and ${\mathrm{YBa}}_2{\mathrm{Cu}}_3{\mathrm{O}}_{7–x}$ in the oxygen background gas. The zero-pressure lifetime and the quenching rate were also determined as ${\tau }_0=357 \mathrm{ns}$ and $k=5.1\times {10}^{-6} {\mathrm{ns}}^{-1} {\mathrm{mTorr}}^{-1}$, respectively. The spatiotemporal changes of the collisional quenching of BaO molecules were successfully visualized, and the influence of the quenching on the spatial distribution imaging of BaO molecule was corrected.

© 1999 Optical Society of America

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