Abstract
We report on measurements of the parameter and absolute differential cross section for electron-impact excitation of the state in barium from the metastable, isotropically populated level at 20 eV impact energy. The determination of these scattering parameters was facilitated by the utilization of a novel laser excitation geometry and measurement scheme. Along with our previous measurements of electron-impact coherence parameters for this transition we now have available a complete set of the five parameters which characterize the excitation of a P state by the scattering of unpolarized electrons from an isotropic (metastable) D level. Comparison of measured values with recent calculations carried out in the unitarized distorted-wave approximation reveals good agreement.
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