Gas-Phase Electron Resonance Spectrum of ClO

The electron resonance spectrum of ClO in the gas phase is described, and the theoretical analysis is discussed in detail. As a result of this analysis, values of the following molecular constants are obtained. The fine-structure constant A = − 282±9 cm−1, the rotational constant B0=0.622±0.001 cm−1 (for 35Cl16O), the 35Cl nuclear hyperfine constant h = 111±2 Mc/sec, and the 35Cl quadrupole coupling constant e2Qq=−88±6 Mc/sec. Corresponding values of the 37Cl hyperfine constants are also obtained. The results are discussed in terms of the expected ground-state electron configuration of the radical.