Vibronic spectra of the ozonide ion in the matrix-isolated M+O3− species

Matrix reactions of alkali metal atoms and ozone molecules at high dilution in inert gases produced a clear yellow film during condensation at 10–22 K on a sapphire plate which yielded vibronic spectra of the M+O3− species. Best resolution of up to 14 vibronic bands spaced 800–900 cm−1 apart was obtained for the lithium and sodium compounds. These bands formed a strong progression in ν1′ and the first six bands exhibited the presence of a weaker progression in ν2′. The band origin was located at 17 730 cm−1 for Li+16O3− and Li+18O3− in solid krypton. Harmonic and anharmonic vibrational constants were determined graphically for the excited electronic state.