P. Murtz et al., FARADAY LMR SPECTROSCOPY OF THE MGO A(1)PI-X(1)SIGMA-2) AND A(3)PI(0,1)-X(1)SIGMA+ (0-1) BANDS( (0), Molecular physics, 82(5), 1994, pp. 989-1007
We report the first direct observation of transitions between the stro
ngly mixed low lying X1SIGMA+, a3PI and A1PI electronic states of (MgO
)-Mg-24-O-16. The A1PI-X1SIGMA+ (0-2) band and the a3PI0.1-X1SIGMA+ (0
-1) intercombination bands have been detected. The measurements were p
erformed with the CO laser Faraday laser magnetic resonance (LMR) tech
nique in combination with a special oven set-up for the MgO production
. The LMR data were fitted together with already published data to an
effective Hamiltonian where the spin-orbit, orbit-rotation and Zeeman
interactions between these three electronic states are included direct
ly. We determined the interaction parameters and obtained a set of eff
ective deperturbed molecular parameters of MgO in the X1SIGMA+ (v = 0,
1, 2), a3PI (v = 0) and A1PI (v = 0) states. These parameters describ
e the LMR data within 7 x 10(-4) cm-1 (21 MHz) on average, which corre
sponds to the experimental uncertainty.