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In this work, the BaI D2Σ+and G2Σ+electronic states were investigated using laser-induced fluorescence (LIF) and Fourier transform spectroscopy (FTS). The LIF visible spectra were obtained by using the second harmonic of the Ti:sapphire single-mode laser and the Ar+and Kr+multimode lasers as excitation sources. Previously recorded data, taken from C. A. Leach, A. A. Tsekouras, and R. N. Zare (1992, J. Mol. Spectrosc. 153, 59–72) and from R. F. Gutterres, J. Vergès, and C. Amiot (1999, J. Mol. Spectrosc. 196, 29–44; 2000, J. Mol. Spectrosc. 200, 253–260; and 2000, J. Mol. Spectrosc. 201, 326–327) were combined with the present data. Accurate and improved molecular constants for the X2Σ+, B2Σ+, A′2Δ, A2Π, C2Π, and D2Σ+states and 16 term values of the G2Σ+state were derived from a simultaneous treatment of the whole data set (12 684 transitions) with a standard deviation of 3.26×10−3cm−1.

The E2Σ+→ C2Π Rydberg–Rydberg transition of 14N16O near 8492 cm−1has been studied by Fourier transform spectrometry in the emission from a dc excited supersonic jet expansion and from a dc discharge under equilibrium conditions. The same transition has also been observed in laser-induced stimulated emission. Line wavenumbers of the 0–0, 1–1, and 2–2 bands, together with data for previously published near-infrared transitions, have been reduced to consistent sets of rovibronic term values for v= 0, 1, and 2 of the A2Σ+, D2Σ+, E2Σ+, and C2Π states which frequently serve as intermediates in the multiphoton excitation of higher Rydberg levels of NO.

Near-infrared and visible spectra of the A2Π–X2Σ+, C2Π1/2–A2Π1/2, C2Π1/2–B2Σ+, and C2Π1/2–X2Σ+band systems of the BaI molecule were recorded by using Fourier transform spectroscopy (FTS). The spectra were produced from the chemiluminescent reaction Ba + I2and also by using laser-induced fluorescence (LIF) technique in which the laser sources were a Ti:sapphire single-mode laser, a dye single-mode laser, and a Kr+multimode ion laser. Resolved rotational data, originating from 19 vibrational levels (0 ≤ v≤ 5 and 7 ≤ v≤ 19) of the A2Π state, 24 vibrational levels (0 ≤ v≤ 18 and 20 ≤ v≤ 24) of the X2Σ+state, and 8 vibrational levels (1 ≤ v≤ 2 and 9 ≤ v≤ 14) of the C2Π state, were used in the final analysis. Previously recorded data for the B2Σ+–X2Σ+and C2Π–X2Σ+systems, taken from R. F. Gutterres, J. Vergès, and C. Amiot, J. Mol. Spectrosc.196, 29–44 (1999) and from C. A. Leach, A. A. Tsekouras, and R. N. Zare, J. Mol. Spectrosc.153, 59–72 (1992), were added to the present work data field. Accurate and improved molecular constants, for the X2Σ+, B2Σ+, A2Π, and C2Π states, were derived from a simultaneous treatment of the whole data set.

In this paper a new spectroscopic investigation on the X1Σ+electronic ground state of the RbCs molecule is reported. This study is conducted by using laser-induced fluorescence combined with Fourier transform spectroscopy (LIF–FTS). More than 23000 spectral data are used in a global linear reduction to molecular constants. With these new and improved molecular constants, the potential energy curve has been calculated by the inverted perturbation approach (IPA). Accurate values for the dissociation energy and the long-range parameters have been derived.

The near-infrared spectrum of the B2Σ+–X2Σ+band system of the BaI molecule, obtained from the chemiluminescent reaction Ba + I2and also by laser-induced fluorescence (LIF), was recorded by using Fourier transform spectroscopy (FTS). The LIF spectra were obtained by using a Ti:sapphire single-mode laser excitation. Resolved rotational data, originating from 32 vibrational levels (0 ≤ v≤ 31) in the X2Σ+state and from 24 vibrational levels (0 ≤ v≤ 19, and v= 21, 22, 23, 26) in the B2Σ+state, were used in the final analysis. Previously recorded data for the C2Π–X2Σ+band system (with Δv= 0), taken from C. A. Leach, A. A. Tsekouras, and R. N. Zare, J. Mol. Spectrosc.153, 59–72 (1992), were added to the present work data field. Accurate and improved molecular constants for the X2Σ+, B2Σ+, and C2Π states were derived from a simultaneous treatment of the whole data set.