High-resolution laser-rf spectroscopy on the A2Π3/2-X2Π3/2 system of lodine oxide (IO)

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Scientific paper

The rotational spectra of the vibrationa bands 2-0, 2-1, and 2-2 of the A2Π3/2-X2Π3/2 system of the IO radical have been studied at high resolution by molecular-beam laser-excitation spectroscopy. The hyperfine structure could be resolved for the lowest rotational levels and the hyperfine constants eQq1 and a + (1/2)(b + c) have been determined for both the excited and ground states. Hyperfine splittings within rotational levels of the ground vibrational X2Π3/2 state have been studied by a new spectroscopic method: microwave optical double resonance on a state-selected beam. The hyperfine constants eQq2 and b - CI (λ - 2) of the v = 0, X2Π3/2 state could be deduced as well. The widths of the rotational levels in the excited v = 2, A2Π3/2 state have been determined. Apart from the vibrationally dependent predissociation, a predissociation which depends on the rotational state has been observed.

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