Abstract
Abstract The two lowest rotational transitions of the IO radical in the 2 Π 3 2 ground electronic state have been observed by means of a Stark modulated spectrometer. The effective rotational constants in the 2 Π 3 2 state, the centrifugal distortion constant, the axial component of the magnetic hyperfine interaction, and the nuclear electric quadrupole coupling constant are determined accurately. It was necessary to take into account the second-order effects from the matrix elements off-diagonal in J for the analysis of the hyperfine structure. An equilibrium internuclear distance r e is calculated to be 1.8677 ± 0.0028 A from the effective rotational constant B 0 ( 2 Π 3 2 ) , combined with α 3 from the A 2 Π → X 2 Π transition.
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