Abstract
Rotational analyses of 32 subbands of the near-infrared 3Φ → (1)3Δ system of LaF have been carried out, involving the levels v = 0–7 of the two states. The three subsystems were first treated as separate singlet systems, directly at equilibrium. Perturbations were revealed in the lower state, ascribed to spin–uncoupling interactions between (1)3Δ3(v) and (1)3Δ2(v + 1) levels. A 21 × 21 matrix representation at equilibrium of the complex of interacting levels (v = 0–6) was then constructed, each diagonal v-block corresponding to a triplet model of the rovibrational 3Δ Hamiltonian. The observed perturbations were completely reduced in the harmonic oscillator approximation with an experimental value of the interaction parameter BΔ0,1 = 0.01322(2) cm−1. The wavenumbers of some 4500 lines of the system were fitted with an rms error of about 0.005 cm−1. (Line lists are available in electronic form via http://www-obs.univ-lyon1.fr/~ABernard/index.html.)
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