Experimental and theoretical studies of Λ doublings and permanent electric dipoles in the low-lying Π1 states of NaCs

摘要: We present experimental data on the electric permanent dipole moments d(υ′,J′) and Λ splittings (q factors) in quasidegenerate (3)Πe∕f1 state of NaCs molecule over a wide range vibrational (υ′) rotational (J′) quantum numbers by using combination dc Stark mixing radio frequency-optical double resonance methods. Within (3)Π1 υ′ ranged from υ′=0 to 34, q values exhibited pronounced decrease 7.91×10−6to0.47×10−6cm−1, while ∣d∣ varied between 8.0 5.0D. Experimental evaluation yielded small d about 1D for D(2)Π1 υ′<3 levels. The experiment is supported ab initio electronic structure calculations performed (1–3)Π1 states means many-body multipartitioning perturbation theory potential energy curves, dipole, angular coupling matrix elements lowest singlet states. predicted reproduce their counterparts within measurement errors theore...