The ground X Σ1g+ electronic state of the cesium dimer: Application of a direct potential fitting procedure

摘要: A collection of 16,544 fluorescence series spectroscopic line positions involving the (1)Sigma(u)(+)-->X (1)Sigma(g)(+) transition in Cs(2) has been analyzed by a modern direct potential fitting procedure to generate first fully analytical energy function for ground electronic state, and precise term values excited (1)Sigma(u)(+) state. The yields an accurate representation data that span 99.24% well depth number fitted parameters is significantly less than half determined conventional Dunham analyses. novel variant Morse/long-range model employed state potential, critical comparison made with extended modified Lennard-Jones model. Proper account taken known long-range van der Waals form our final constrained literature C(8) C(10) dispersion coefficients, along value C(6)=3.31(5) x 10(7) cm(-1) A(6)=6870(100) a.u. dissociation (D(e)) compared precisely based on recent analysis from two-photon transfer process (STIRAP) ultracold Cs atoms. It concluded hyperfine effects X are not negligible, estimate D(e)=3649.84(7) obtained this work represents effective limit lying between two lowest limits. Precise rotational centrifugal distortion constants have also calculated through perturbation theory. These estimates consistent derived experimental information.