The study of pressure-broadened profile of alkali metals in the presence of parent or foreign atoms, has in recent years become a subject of great importance in astrophysics, spectroscopy, quantum chemistry, and laser physics. Exploring the photoabsorption spectra of the alkali-alkali systems and locating the position and origin of the possible satellite peaks allow us to study the physical and chemical properties of the atmospheres of astromonic objects dominated by alkali-metal atoms.
This work deals with the pressure-broadening phenomena which undergoes the sodium Na(3s/3p) perturbed by ground Lithium Li (2s) atoms. The Na(3s/3p)+Li(2s) potentials, as well as the transition dipole moments, are carefully constructed and their accuracy is established by determining the vibration-rotation levels and the radiatives lifetimes of the excited molecular states. The result shown that the NaLi photoabsorption spectra is dominate by the singlet transitiosns and exhibits in the red wing a satellite feature around the wavelength 685nm, attributed to the A←X transitions. The spectra revealed also the appearance of two peaks in the blue wing at the positions 574nm and 490nm originating from the triplet b←a and c←a transitions, respectively.
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