title: Spectroscopic study of the 2(2)Σ+ and the 4(2)Σ+ excited states of LiCa.
abstract: The 2(2)Σ(+) and 4(2)Σ(+) excited states of (7)Li(40)Ca have been studied by high resolution Fourier-transform spectroscopy. The data on the lower state, 2(2)Σ(+), were obtained by analyzing the rotationally resolved spectra of the thermal emission of LiCa in the 2(2)Σ(+) → X(2)Σ(+) band around 9500 cm(-1). These data contained transitions mainly from v' = 0 and 1 for N' up to 92 and allowed us to derive molecular parameters describing the potential curve of the state close to its minimum. The dataset on the second state, 4(2)Σ(+), is much larger and comes from a laser-induced fluorescence experiment. The levels were excited by a single mode dye laser and the 4(2)Σ(+) → X(2)Σ(+) fluorescence was recorded through a Fourier-transform spectrometer. For both states potential energy curves and Dunham coefficients were derived and the spin-rotation structure was evaluated. The results are compared with theoretical and experimental data from the literature.
authors.affiliation: Institut für Quantenoptik, Leibniz Universität Hannover, Welfengarten 1, D-30167 Hannover, Germany.
authors.forename: Alexander
authors.initials: A
authors.lastname: Stein
authors.forename: Milena
authors.initials: M
authors.lastname: Ivanova
authors.forename: Asen
authors.initials: A
authors.lastname: Pashov
authors.forename: Horst
authors.initials: H
authors.lastname: Knöckel
authors.forename: Eberhard
authors.initials: E
authors.lastname: Tiemann