J. Phys. II France
Volume 2, Numéro 4, April 1992
Page(s) 813 - 825
DOI: 10.1051/jp2:1992168
J. Phys. II France 2 (1992) 813-825

Hyperfine structure measurements in the IF B-X system

G. Gouédard1, N. Billy1, B. Girard2 and J. Vigué2

1  Laboratoire de Spectroscopie Hertzienn, Département de Physique de l'E.N.S., 24 rue Lhomond, 75231 Paris Cedex 05, France
2  Equipe de Dynamique des Edifices Atomiques, IRSAMC, Université Paul Sabatier, 118 route de Narbonne, 31062 Toulouse Cedex, France

(Received 25 November 1991, accepted 18 December 1991)

We have measured and analyzed the hyperfine structure of a large number of optical transitions belonging to the IF B-X system. These transitions sample a large range of rovibrational levels ( $9 \leqslant v''\leqslant 18$ in the X state, $0\leqslant v' \leqslant 10$ in the B state, with $J\leqslant 125$). The hyperfine constants deduced from the observed spectra present some interesting variations with the rovibrational levels. We analyze carefully the electric quadrupole coupling constant in the X state and show that its variation is a sensitive probe of the ionic character of the IF molecular bond.

35.20S - 31.30G

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