Abstract
Electronic bands belonging to the [20.4] 3Φ→(1) 3Δ system have been observed in the emission spectrum of lanthanum monofluoride at high temperature in the presence of the Ar + 457.9-nm laser line: the (0–0), (1–1), (2–2), and (3–3) bands of the 3Φ 4→ 3Δ 3 subsystem and the (0–0) bands of the 3Φ 3→ 3Δ 2 and 3Φ 2→ 3Δ 1 subsystems. Rotational structures which are well developed in these experimental conditions were analyzed. The data were treated using a polynomial expression for the upper levels term-values, directly at equilibrium for 3Φ 4, whereas a previous Hamiltonian matrix representation of the (1) 3Δ state was assumed. A Hund's case (a) representation of the [20.4] 3Φ state at v=0 was also considered. Perturbations affecting 3Φ 2 levels at v=0 were observed; the energy and rotational constant of the perturbing state and the interaction parameter were estimated.
Published Version
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