Hyperfine interactions in the gas-phase E.P.R. spectra of35ClO (2Π3/2) in theJ= 5/2 andJ= 3/2 levels

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Abstract
Gas-phase E.P.R. spectra of 35ClO have been measured accurately both in the J=5/2 and J=3/2 rotational levels, using C-band (4·4 GHz) and X-band (9·4 GHz) microwaves, respectively. Special attention has been paid to separate the spectral lines of 35ClO from those of 37ClO. Analysis of the spectra has resulted in the simultaneous determination of the hyperfine parameters h and b and, when combined with a-(b+c)/2 obtained by microwave spectroscopy, the hyperfine parameters a, b and c are all determined. Molecular constants which describe the distribution of the unpaired electron around the chlorine nucleus are derived from them. The molecular g values of the rotational levels indicate the mixing of the 2Π state both with the 2Σ+ and with the 2Δ electronic excited states.