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The [20.4]3Φ→(1)3Δ Green System of LaF

✍ Scribed by A Bernard; C Effantin; J Chevillard; J d'Incan

Publisher
Elsevier Science
Year
2002
Tongue
English
Weight
94 KB
Volume
215
Category
Article
ISSN
0022-2852

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✦ Synopsis

Electronic bands belonging to the [20.4] 3 → (1) 3 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 3 4 → 3 3 subsystem and the (0-0) bands of the 3 3 → 3 2 and 3 2 → 3 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 3 4 , whereas a previous Hamiltonian matrix representation of the (1) 3 state was assumed. A Hund's case (a) representation of the [20.4] 3 state at v = 0 was also considered. Perturbations affecting 3 2 levels at v = 0 were observed; the energy and rotational constant of the perturbing state and the interaction parameter were estimated.

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