The C(2)Π state in Rb. Observation and deperturbation.

We report a systematic study of the C(2)Πelectronic state in rubidium dimer, observed in polarization labelling spectroscopy experiment through the C ← XΣ transitions recorded under rotational resolution in two isotopologues Rb and RbRb. Regularity of the vibrational progressions was distorted by numerous interactions with the surrounding 2Σ, 2Πand 3Σstates. Deperturbation was performed by coupled-channels analysis taking into account spin-orbit and rotational interactions.

Spectroscopic study of the 2(2)Σ+ and the 4(2)Σ+ excited states of LiCa.

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 B(1)Π and D(1)Π states of LiRb.

We studied the molecule LiRb in the gas phase with high resolution by Fourier-transform spectroscopy of laser induced fluorescence. The spectra were assigned to transitions between the ground state X(1)Σ(+) and B(1)Π or D(1)Π states and showed perturbations. For levels with e symmetry the coupling to the nearby state C(1)Σ(+) was included in the analysis by means of coupled channel calculations.

Fitting potential energy curves for diatomic molecules using experimental line intensities.

The existing routines for construction of experimental potential energy curves for diatomic molecules are based mainly on transition frequencies while the line intensities are seldom used. Some of the reasons for this are experimental: the line intensities are usually measured with much higher uncertainty. Other are numerical and the main problem is to fix the sign of the overlap integrals since the line intensity depends on their square.

The X2Σ+ state of LiCa studied by Fourier-transform spectroscopy.

The paper reports on a successful observation of high resolution Fourier transform spectra of LiCa. The fine structure of the ground state was observed and attributed to effective spin-rotation interaction. The experimental observations are described by two models using potential energy curves.

The X 1Σ+ state of LiRb studied by Fourier-transform spectroscopy.

We report on the first experimental observation of the ground electronic state of the LiRb molecule at high resolution. A large body of experimental data was collected which led to an accurate potential energy curve for this state. Transitions to the lowest triplet state were also observed, but these data are rather fragmentary and allow only a first attempt for the description of this state.