Abstract
Absolute normalized differential electron-impact excitation crosssections (DCSs) are presented for the lowest three electronic states ofargon: the lowest resonance 4s[3/2]1 (1s4 in Paschen'snotation) state and two neighbouring metastable 4s[3/2]2 and4s'[½]0 (1s5 and 1s3 in Paschen's notation) states.Direct, i.e. free of a cascade contribution, excitation cross sections wereobtained experimentally for the 4s[3/2]1 state at 20, 40, 50 and80 eV and for the 4s[3/2]2 and 4s'[½]0 states at 20and 40 eV impact energies. The measurements were performed atscattering angles between 5° and 150° withan angularresolutionof better than 2°. The ratios:r = DCS(4s[3/2]2)/DCS(4s'[½]0) andr' = DCS(4s[3/2]1)/DCS(4s'[½]1)were determined and compared with other available experimental andtheoretical results. The absolute DCS scale was established with respectto DCSs of the 4s'[½]1 state(Filipovic et al 2000 J. Phys. B: At. Mol. Opt. Phys. 33677) using the peak intensity ratios inthe energy-loss spectra. The DCSs were extrapolated to 0° and180° and numerically integrated to yield integral, momentumtransfer and viscosity cross sections.
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More From: Journal of Physics B: Atomic, Molecular and Optical Physics
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