Temperature Dependences of the Quantum-Mechanical and Semi-Classical Spectral-Line Widths and the Separation no of the Impact and Non-Impact Regions for an Ar-Perturbed/K-Radiator System

摘要

Quantum-mechanical and semi-classical spectral-line shapes are computed at T = 400, 800, and 1000 K for the line core of the 5802 A line of the Ar-Perturbed/K-Radiator system. HWHMs (w's) are measured from computed full spectral-line shapes. The final-state pseudopotential is for the 7s~2 S_(1/2) state, and the initial-state potential is for the 4p~2 P_(3/2,3/2) state. Three high-pressure (P) log( w)—versus—log(P) curves, corresponding to the non-impact region, intersect a similar set of low-P, impact-region curves at intersections, Po's. Similarly, for two sets of log( w)—versus—log(n) curves, which yield intersections, no's, where n is the perturber density. These no's and po's separate the two regions and represent the upper limits of the impact regions. A specific validity condition for the impact region is given by the equation n no. From an earlier spectroscopic, Fabry-Perot paper, w_(expt) = 0.021 cm~(-1) at T = 400 K and P = 10 torr. Two theoretical values, w theor = 0.025 and 0.062 cm~(-1) corresponding to two different pseudo-potentials, are reported. Two T-dependent figures are given, in which the first shows an increase in the impact region with T, based on P as the basic parameter, and the second which shows a decrease in the impact region with T, based on n as the basic parameter.