Beschreibung:
<jats:p>The 22Σ+ and 42Σ+ excited states of 7Li40Ca have been studied by high resolution Fourier-transform spectroscopy. The data on the lower state, 22Σ+, were obtained by analyzing the rotationally resolved spectra of the thermal emission of LiCa in the 22Σ+ → X2Σ+ 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, 42Σ+, is much larger and comes from a laser-induced fluorescence experiment. The levels were excited by a single mode dye laser and the 42Σ+ → X2Σ+ 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.</jats:p>