Studies on the High-lying R-branch Transitional Spectra of NaAs Molecule

A new analytical formula is derived from the conventional expression of R-branch transitional energies for diatomic molecule based on the difference converging method (DCM) that was established in our previous work.By using the new formula, onlya set of 11 known R-branch experimental transitionspectral linesare needed to predict correctly high-lying transitional spectra that may not be available experimentally. In this work, the R-branch spectral data of (0, 0) band in the A₃0⁺→X₁0⁺ transitional system of NaAs moleculewas studied. The results not only obtained some unknown low-lying transitional spectra, but also correctly predicted the high excited states transitional lines including rotational quantum number up to J=80. Furthermore, a lot of important structural information were provided to further understanding the microstructure of the NaAs material for the relevant research field.