Quantal studies of sodium 3 p ← 3 s photoabsorption spectra perturbed by ground lithium atoms

The pressure broadening in the far wings, where the sodium Na ( <?CDATA 3p← 3s?> 3 p ← 3 s ) resonance line is perturbed by ground lithium Li (2s) atoms, has been theoretically analyzed. The NaLi potential–energy curves and the transition dipole moments are constructed by using a reliable ab initio data points to carry out the reduced-absorption coefficients <?CDATA kᵣ(ν,T)?> k r ( ν , T ) . This quantum-mechanical investigation have demonstrated that the NaLi profile spectra show a satellite future in the red wing at wavelength λ =685 nm in the temperature range 4000 K–1.8×104 K. The computation could also exhibit a second satellite, in the blue wing, near the wavelength λ =574 nm beyond 6000 K and a third peak located at λ =490 nm which begins to appear at 1.8×104 K.