Auto-ionizing states in Cs between 12 and 20 eV have been studied by electron impact. The retarding-potential-difference method was used to obtain an electron beam with energy spread of about 0.1 eV. To determine the threshold energies, inelastically scattered electrons were analyzed by the trapped-electron method. We have been able to identify about 20 levels, and the agreement with spectroscopic data is excellent. A peak appearing at 12.80 eV is probably due to the quartet states observed by Feldman and Novick. © 1971 The American Physical Society.
Y. B. Hahn and K. J. Nygaard, "Electron-impact Excitation Of Auto-ionizing Levels In Cesium," Physical Review A, vol. 4, no. 1, pp. 125 - 132, American Physical Society, Jan 1971.
The definitive version is available at https://doi.org/10.1103/PhysRevA.4.125
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01 Jan 1971