Detection of C<sub>2</sub>H<sub>2</sub> via UV photo-fragmentation, followed
by monitoring the C<sub>2</sub>
<i>d</i><sup>3</sup>Π<sub>g</sub>-<i>a</i><sup>3</sup>Π<sub>u</sub> fluorescence, is
explored at atmospheric pressure and at temperatures of 295 K, 600 K, and 800 K, for
excitation wavelengths 210 to 240 nm using a broadband laser source (∼3
cm<sup>-1</sup> fwhm). At the lower temperature, C<sub>2</sub> emissions
correlate closely with C<sub>2</sub>H<sub>2</sub> Ã ← X absorption bands, and the
excitation spectra suggest a higher-transition probability for the
v<sup>"</sup><sub>4</sub> = 2 and 3 states than for the
v<sup>"</sup><sub>4</sub> = 0 and 1 states. As temperature increases, the
excitation spectra exhibit a higher nonresonant background.
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