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A study of autoionising transitions in metal vapour atoms by ejected electron spectroscopy

A study of autoionising transitions in metal vapour atoms by ejected electron spectroscopy
A study of autoionising transitions in metal vapour atoms by ejected electron spectroscopy

The ejected-electron spectra of Hg, Sn, Yb, Cu and Mg atoms following electron impact excitation have been recorded and used to determine the energy level structure of these elements. The experimental work was performed on two crossed-beam electron spectrometers which could achieve sample temperatures from 30 to 1600oC and incident electron beam energies in the range 8 to 1450 eV; ejected-electron angular distribution measurements were also possible. The ejected-electron spectrum was observed over the ejected energy range O to 50 eV at a resolution of 40 meV. Many new features were revealed, particularly those attributed to the decay of levels excited by non-optical transitions following excitation by low energy incident electrons. The data was analysed by comparison with new Hartree-Fock calculations, with existing photoabsorption and ejected-electron data, and with quantum defect predictions. Many new energy levels were located and labelled according to appropriate coupling schemes. In the special case of Mg, the inner shell alignment of the 2p vacancy present in the intermediate state of the L3-M2,3M2,3 Auger transition was studied. The alignment parameter A2 as a function of the energy of the incident electron was found to have a minimum at approximately twice the threshold energy, confirming the earlier results of DuBois et al. (D67952/86)

University of Southampton
Forrest, Laurence Frederick
Forrest, Laurence Frederick

Forrest, Laurence Frederick (1985) A study of autoionising transitions in metal vapour atoms by ejected electron spectroscopy. University of Southampton, Doctoral Thesis.

Record type: Thesis (Doctoral)

Abstract

The ejected-electron spectra of Hg, Sn, Yb, Cu and Mg atoms following electron impact excitation have been recorded and used to determine the energy level structure of these elements. The experimental work was performed on two crossed-beam electron spectrometers which could achieve sample temperatures from 30 to 1600oC and incident electron beam energies in the range 8 to 1450 eV; ejected-electron angular distribution measurements were also possible. The ejected-electron spectrum was observed over the ejected energy range O to 50 eV at a resolution of 40 meV. Many new features were revealed, particularly those attributed to the decay of levels excited by non-optical transitions following excitation by low energy incident electrons. The data was analysed by comparison with new Hartree-Fock calculations, with existing photoabsorption and ejected-electron data, and with quantum defect predictions. Many new energy levels were located and labelled according to appropriate coupling schemes. In the special case of Mg, the inner shell alignment of the 2p vacancy present in the intermediate state of the L3-M2,3M2,3 Auger transition was studied. The alignment parameter A2 as a function of the energy of the incident electron was found to have a minimum at approximately twice the threshold energy, confirming the earlier results of DuBois et al. (D67952/86)

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Published date: 1985

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Local EPrints ID: 461512
URI: http://eprints.soton.ac.uk/id/eprint/461512
PURE UUID: 47090667-2c8e-42d7-9531-1b552208d6f2

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Date deposited: 04 Jul 2022 18:48
Last modified: 04 Jul 2022 18:48

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Author: Laurence Frederick Forrest

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