Observation of new vibronic transitions in the B̃2A′ʹ−X̃2A′ʹ manifold of the CH2CHO radical

New laser induced fluorescence spectroscopic transitions of the vinoxy (CH2CHO) radical have been observed and assigned in the 310–330 nm wavelength region fluorescence. Both eecitation and emission spectra have been recorded. In the excitation spectrum, the peaks at 30 211, 30 381 and 30 637 cm−1 have been assigned to the 601, 501 and 401 vibronic transitions of the B̃2A′ʹ−X̃2A′ʹ manifold. The assignments are 1376, 1565 and 1553 cm−1 for the ν6, ν5 and ν4 vibrational modes, respectively in the ground electronic state, and 1413, 1583 and 1634 cm−1, respectively in the excited state.