Abstract
Infrared transitions involving vibrationally excited C2H radicals produced by excimer laser (193 nm) flash photolysis of acetylene were observed in transient absorption by color center laser probing. Three bands with origins at 3702, 3562, and 3320 cm−1 were found, assigned, and analyzed. All three bands are of 2∑–2∑ symmetry with the lower state of each transition the vibrationally excited (0,0,1) level of the ground electronic state. The frequencies and fitted spectroscopic constants for the three bands are reported. Possible vibronic assignments of the upper states are discussed.
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