Hypersatellites of the ${\mathit{KL}}_{2,3}$${\mathit{L}}_{2,3}$ Auger lines were observed in Ne atoms bombarded by a 5-keV electron beam. The relative intensity of the ${}_{}{}^2{}_{}{}^{}$S${,}^2$P${,}^2$D line group with respect to the ${}_{}{}^1{}_{}{}^{}$S${,}^1$D diagram lines and the energies of particular transitions were determined. The ${}_{}{}^4{}_{}{}^{}$P line was traced, although its definite identification is hindered by poor counting statistics. For an impact electron energy of 2.68 times the threshold energy, the ratio of the double- to-single-ionization cross section was found to be (1.45±0.30)×${10}^{\mathrm{-}3}$.

• Received 6 July 1993

DOI:https://doi.org/10.1103/PhysRevA.49.1480