2016
DOI: 10.1088/0953-4075/49/14/145201
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The 5p autoionization spectra of Ba atoms excited by electron impact: identification of lines

Abstract: The ejected-electron spectra corresponding to the radiationless decay of 5p5 states in Ba atoms have been measured precisely for different incident electron energies ranging from the appearance of the first autoionizing line at 15.68 eV up to 140 eV. The spectra have been obtained at an observation angle of 54.7° and with incident-electron and ejected-electron energy resolutions of 0.2 eV and 0.07 eV, respectively. In total, 63 lines with excitation thresholds below 22 eV have been observed between 9.8 and 16… Show more

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Cited by 8 publications
(29 citation statements)
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“…1. Comparing the spectra shows that low-energy lines 4-17, which reflect the decay of dipole-forbidden states [4], are dominant in the spectrum at 27.5 eV, whereas lines 23-60 associated with dipole-allowed states are most noticeable in the spectrum at 102 eV. However, as will be shown below, the dipole-allowed states possess also the strong excitation maxima at nearthreshold impact energies.…”
Section: Measuring Procedures and Calculation Methodsmentioning
confidence: 80%
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“…1. Comparing the spectra shows that low-energy lines 4-17, which reflect the decay of dipole-forbidden states [4], are dominant in the spectrum at 27.5 eV, whereas lines 23-60 associated with dipole-allowed states are most noticeable in the spectrum at 102 eV. However, as will be shown below, the dipole-allowed states possess also the strong excitation maxima at nearthreshold impact energies.…”
Section: Measuring Procedures and Calculation Methodsmentioning
confidence: 80%
“…The measuring and the data processing procedure used for obtaining the excitation cross-sections of the autoionizing states were described earlier [7,8] in details. In the present study, the ejected-electron spectra corresponding to the decay of the 5p 5 1 1 2 2 3 3 autoionizing states of Ba atoms were measured by employing an electron spectrometer consisted of a monochromator and an analyzer (both of the 127 ∘ electrostatic type), and an atomic beam source designed for working temperatures up to 700 ∘ C [4]. The incident-and ejected-electron energy resolutions (FWHM) were about 0.2 eV and 0.07 eV, respectively.…”
Section: Measuring Procedures and Calculation Methodsmentioning
confidence: 99%
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