High pressure line shapes for Cs D1 and D2 lines and empirically informed interaction potentials

Theoretical investigation of the pressure broadening D1 and D2 lines of cesium atoms colliding with ground-state helium atoms

“…The principal and dominant alkali-metal D 1 and D 2 lines, broadened by elastic collisions with rare-gases, have been a subject of many theoretical and experimental studies. More precisely, the determination of the profiles and satellite features in the wings of the heavy alkaline atoms evolving in the bath of He atoms has been, very recently, the goal of several theoretical [1][2][3][4][5][6][7] and experimental [5,8,9] works.…”

“…As far as we know, the photoabsorption profiles generated by the pressure-broadening of D 1 and D 2 lines of cesium atom immersed in a bath of diluted helium gas has been studied theoretically, in the frame work of classical theory, by Allard et al [1] and Hager et al [5] using the unified and Anderson-Tallman theories, respectively. In addition, the photoemission profiles are experimentally realized by Hedges et al, [8] however, the photoabsorption spectra are very recently measured by Hager et al [5] The primary focus of the current work is to determine, in the framework of purely quantum mechanical study, the photoabsorption and photoemission profiles of the D 1 and D 2 lines of the cesium atom perturbed by the helium one, and the satellite features appearing in the wings. We also analyze carefully the behavior of the shape profiles, the form of the satellites, and their positions at certain well-defined temperature values.…”

Influence of basis-set size on the XΣ1/2+2 , A

“…The buffer gas is used to pressure broaden the alkali D2 line to match the pump bandwidth as well as facilitate the fine structure transition. This has driven recent interest in pressure broadened D1 and D2 line shapes [6][7][8][9][10] of alkali-metal atoms as well as fine structure transition rates [11,12].…”

Pressure-broadened atomic Li(2s-2p) line perturbed by ground neon atoms in the spectral wings and core

“…Various technical methods are used, namely, the laser induced fluorescence, [15][16][17] the two-step laser excitation, [18] the Doppler free two-photon spectroscopy, [19] the combination of the scattering and laser-spectroscopic measures, [20] and the high resolution laser spectroscopy including rotational analysis. [21] In the present particular case, the quantal computations of the LiNe emission spectra made by Mason, [22] based on PECs and TDMs computed by two different methods, namely, the model potential and pseudopotential, are in clear disagreement with the available experimental data measured at T = 670 K by Scheps et al [15] and at T = 130 K, 300 K, and 670 K by Havey et al [23] In this paper, we perform full quantum-mechanical calculations of the far-wing emission and absorption coefficients and line-core width and shift of the Li(2p-2s) resonance spectral line. For these calculations, we have chosen to use the potential-energy curves and transition dipole moments of the LiNe quasimolecule generated with the ab initio methods, in which we adopt the state-averaged complete active space self consistent field (SA-CASSCF) with the multireference configuration interaction (MRCI) procedures.…”