Spectroscopy and Collision Theory. The Xe Absorption Spectrum

Experiments on the uv photoabsorption of Xe have determined level positions, line intensities, Landé $g$ factors, intensity profiles in the auto-ionization region, and the branching ratio of photoelectron groups. This paper expresses all these data in terms of a single set of theoretical parameters which pertain to collisions of the $e+{\mathrm{Xe}}^{+}$ system with $J=1\mathrm{}$ and characterize the five close-coupling eigenchannels of this system. Values of the parameters, obtained by fitting the experimental data, provide (1) values of the zero-energy scattering eigenphases, (2) evidence that the orbital angular momentum of the free electron ($l=0\mathrm{} or 2$) is a good quantum number to within ∼ 2%, and (3) evidence that the $\mathrm{LS}$ coupling classification of the $e+{\mathrm{Xe}}^{+}$ complex holds approximately, but only for $l=2\mathrm{}$. The whole analysis correlated diverse experimental data into a unified pattern and can be extended to other values of $J$ and $l$ to other rare gases and to spectra of other elements.