Long-range potentials for the X1∑g+ And (1)1Σg states and the dissociation energy of Na2

On the Method of Monitoring of Classical Vibrations in Sodium Dimer

“…Potential energy curves for the states Χ 1Σ+g , Α1 Σ+u , B 1Πu and (2) 1Πg were taken from Refs. [12][13][14][15][16]. We assumed that μXA, μAR and μRB do not depend substantially on the internuclear distance, what is a reasonable approximation for the limited range of R sampled by the wave packets.…”

Feshbach spectroscopy and analysis of the interaction potentials of ultracold sodium

“…The R-dependent functions are found in a fit to all known Feshbach resonances and existing spectroscopic data of more deeply bound rovibrational levels of the X 1 + g and a 3 + u potentials [8][9][10][11][12]. Data from conventional spectroscopy by Kush and Hessel [39] and by Barrow et al [40] for the ground-state X 1 + g potential and by Li Li et al [41] for the lowest triplet state a 3 + u potential are also included. The fits based on the coupled-channels solutions will then lead to a consistent description of the sodium dimer that is valid over the full depth of the X 1 + g and a 3 + u potentials and will be a well justified system to predict scattering properties or dynamics like spin exchange.…”

“…With the new potential functions from this first step all pure singlet and triplet rovibrational levels related to the Feshbach and photoassociation data are calculated and the results are added to the spectroscopic data of Refs. [10,[39][40][41]. Then the second fitting step yields the improved potentials including all regions in R. With this result the first fit was repeated, from which again better rovibrational levels will be derived for the overall potential fit.…”

A Na2 X 1 Σ+ g and (1)1Π g electronic states long range analysis

“…To prove this assertion, this paper presents a long range study in one of the most studied electronic states of diatomic molecules, the X IZ[ ground electronic state, and the (1) 1Hg excited electronic state. This study has been done using the experimental data from Barrow et al [1]. This data, for both electronic states, has been observed by Laser Induced Fluorescence combined with Fourier Transform Spectroscopy.…”

“…In this paper the Na2 X ~ ~7+ and (1)1rig electronic states long range tail functional behavior is analysed in the light of multipolar expansion theory combined with damping functions. The experimental data used here is the one reported by Barrow et al [1]. In the present paper this experimental data is used in a nonlinear reduction to van der Waals C~ constants using the multipolar expansion Z, C,/r".…”