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- W7090000 abstract "We have measured absolute level cross sections for electron excitation into the 1s{sub 3} and 1s{sub 5} metastable levels of Ar using a laser-induced fluorescence technique. The spin-forbidden nature of the direct excitation process allows us to calibrate absolutely our relative apparent excitation functions by matching them to our absolutely measured total cascade cross sections for electron energies above 90 eV. We find that the peak apparent cross sections for the 1s{sub 3} and 1s{sub 5} levels occur at about 22 eV and are 49 x 10{sup -19} cm{sup 2} and 30 x 10{sup -18} cm{sup 2} respectively. The direct cross sections peak at a few eV above the threshold and their maximum values are 14 x 10{sup -19} cm{sup 2} and 60 x 10{sup -19} cm{sup 2} for the 1s{sub 3} and 1s{sub 5} levels respectively. We have also shown applicability of the pulsed laser system for measuring absolute number densities and time-dependent measurements of these densities after the electron beam cutoff. The ratio of the 1s{sub 3} and 1s{sub 5} densities agrees very well with the ratio of our apparent cross sections." @default.
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- W7090000 date "1993-05-01" @default.
- W7090000 modified "2023-09-27" @default.
- W7090000 title "Measurements of metastable Argon atoms produced by electron impact" @default.
- W7090000 hasPublicationYear "1993" @default.
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