Abstract
The HCO radical was produced by photolysis of acetaldehyde in a supersonic molecular jet. HCO B ̃ ̃ 2A′− X ̃ 2A′ transitions were detected by laser-induced fluorescence. Eight vibronic bands were observed that showed both a- and b-type transitions, indicating that the observed transitions are from the B ̃ ̃ state, not the C̃ state. The quantum yield of fluorescence abruptly decreased at lines 2770 cm −1 above the zero vibrational state of B̃, indicating the onset of a channel leading to predissociation. Rotational spectra of the lowest six vibrational levels of the B̃ state are analyzed.
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