An experimental study of autoionizing transitions in metal vapour atoms
An experimental study of autoionizing transitions in metal vapour atoms
Autoionization processes have been investigated in atomic vapour beams of the metallic elements europium, samarium and manganese using a crossed-beam ejected-electron spectrometer. Autoionizing and Auger transitions have been observed in the high resolution ejected-electron spectra following excitation by an incident electron beam of between 15 and 500 eV kinetic energy. Many previously unobserved transitions have been reported, and in particular the ejected-electron spectrum of samarium has been reported for the first time. Excitation by an electron beam of variable energy has allowed dipole-forbidden transitions to be observed at low incident electron kinetic energies, dipole-allowed transitions were generally found to dominate the spectra at high incident electron kinetic energies. Digital data processing techniques have been implemented on a microcomputer in order to facilitate analysis of the observed spectra. Assignment of atomic transitions to the ejected-electron spectra have been made by comparison with experimental and theoretical data. In addition, assignments have been made by comparison with the results of Hartree-Fock calculations performed by Dr. M. Wilson, and by the identification of Rydberg series from quantum defect calculations.
University of Southampton
1989
Ford, Michael John
(1989)
An experimental study of autoionizing transitions in metal vapour atoms.
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
Autoionization processes have been investigated in atomic vapour beams of the metallic elements europium, samarium and manganese using a crossed-beam ejected-electron spectrometer. Autoionizing and Auger transitions have been observed in the high resolution ejected-electron spectra following excitation by an incident electron beam of between 15 and 500 eV kinetic energy. Many previously unobserved transitions have been reported, and in particular the ejected-electron spectrum of samarium has been reported for the first time. Excitation by an electron beam of variable energy has allowed dipole-forbidden transitions to be observed at low incident electron kinetic energies, dipole-allowed transitions were generally found to dominate the spectra at high incident electron kinetic energies. Digital data processing techniques have been implemented on a microcomputer in order to facilitate analysis of the observed spectra. Assignment of atomic transitions to the ejected-electron spectra have been made by comparison with experimental and theoretical data. In addition, assignments have been made by comparison with the results of Hartree-Fock calculations performed by Dr. M. Wilson, and by the identification of Rydberg series from quantum defect calculations.
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Published date: 1989
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Local EPrints ID: 461543
URI: http://eprints.soton.ac.uk/id/eprint/461543
PURE UUID: 496e11c3-e880-45da-a25e-2e385ed1780d
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Date deposited: 04 Jul 2022 18:49
Last modified: 04 Jul 2022 18:49
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Author:
Michael John Ford
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