INFRARED LMR SPECTRUM OF SEH IN THE X2-PI STATE - DIRECT DETERMINATION OF THE SPIN-ORBIT-COUPLING CONSTANT

Magnetic dipole transitions between the2П½ and2П3/2 components of the ground state of SeH have been observed at about 1780 cm-1 in a L.M.R. experiment using a CO laser. Transitions have been detected for the four most abundant natural isotopes of Se. The transition frequencies depend primarily on the magnitude of the spin-orbit coupling constant and have been analysed in conjunction with data from the E.P.R. spectrum to yield (Formula presented). The admixture of other electronic states by spin-orbit coupling has been investigated to third order in perturbation theory and found to produce significant effects. © 1979 Taylor & Francis Group, LLC.