Hyperfine structure in the electronic spectra of the CdH and CdCH3radicals

摘要

Magnetic hyperfine interactions in the ground and first excited states of CdH and CdCH3were studied using high resolution electronic spectroscopy. Hyperfine splittings associated with the H nucleus were observed in theXstate of CdH; hyperfine splittings associated with111Cd and113Cd were observed in both the ground and first excited states of CdH and CdCH3. The hyperfine parameters of CdH were found to be similar to the corresponding parameters of CdCH3. Comparison of the ground state molecular hyperfine constants with values determined in an Ar matrix electron paramagnetic resonance (EPR) study lsqb;L. B. Knight, Jr. and W. Weltner, Jr., J. Chem. Phys.55, 2061 (1971)rsqb; indicates clearly a shift of unpaired electron spin density towards Cd, in the matrix. The excited state molecular hyperfine constants indicate that the unpaired electron essentially resides in a Cdthinsp;5ppgr;orbital.