Abstract
Two-electron excitation and decay of the autoionizing (2p2)1D and (2s2p)1P states of helium in collisionswith fast protons and helium ions have been studied usingzero-degree target electron spectroscopy. The energy resolution ofelectron emission spectra is 80 meV. Experimental spectra wereprocessed using a parametrization with allowance for theCoulomb interaction in the final state (CIFS) between theejected electron, the scattered ion and the recoil helium ion.The Shore formula was applied as well. Calculations have beencarried out with inclusion of CIFS in both direct and resonantionization amplitudes and within an expansion of a two-electronexcitation amplitude in powers of projectile-target interactionup to the second order. Influence of the three-body Coulombinteraction and effects of the charge and mass of theprojectiles are studied.
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