The ${{{\rm X}}^{2}}{{\Sigma }^{+}}$, ${{{\rm A}}^{2}}\Pi $ and ${{{\rm B}}^{2}}{{\Sigma }^{+}}$ potentials of NaNe from a combined analysis of optical collision and spectroscopic data

Abstract

We present new measurements of differential cross sections for the optical collision process for an extended range of optical detunings. A combined analysis of the present scattering results and the earlier NaNe laser-spectroscopic data by Lapatovich et al (1980 J. Chem. Phys. 73 5419) for optical transitions A-X and B-X is performed using a coupled channels approach in both cases. We obtain the Born–Oppenheimer potentials for the ground state and the excited states and as well as the diagonal and off-diagonal spin-orbit functions of the NaNe van der Waals molecule for a wide range of atomic distances.

Pressure-broadened atomic Li(2s-2p) line perturbed by ground neon atoms in the spectral wings and core

“…The fluorescence intensities of the alkali resonance lines induced by the buffer-gas in the wings are measured as a function of the wavelength and cell temperature. Various technical methods are used, namely, the laser induced fluorescence, [15][16][17] the two-step laser excitation, [18] the Doppler free two-photon spectroscopy, [19] the combination of the scattering and laser-spectroscopic measures, [20] and the high resolution laser spectroscopy including rotational analysis. [21] In the present particular case, the quantal computations of the LiNe emission spectra made by Mason, [22] based on PECs and TDMs computed by two different methods, namely, the model potential and pseudopotential, are in clear disagreement with the available experimental data measured at T = 670 K by Scheps et al [15] and at T = 130 K, 300 K, and 670 K by Havey et al [23] In this paper, we perform full quantum-mechanical calculations of the far-wing emission and absorption coefficients and line-core width and shift of the Li(2p-2s) resonance spectral line.…”