Post-collision interaction (PCI) in inner-shell double ionisation (KL2,3) of Ne by electron impact

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Abstract
The authors present the first measurement of the PCI shift of a double ionisation Auger line after electron impact. The Ne KL2,3-L1L2,32(2P) satellite (nominal Auger energy EA0=751.3 eV) was examined in a wide range of excess energies E1 up to an electron impact energy E0=6 keV. Because of three outgoing electrons the satellite's PCI shift is larger than in all formerly studied processes. Assuming correlated motion of these three electrons the authors calculate the PCI shift as a function of excess energy E1 to be in (E1)=(3 square root 3/2 square root 2) Gamma E1-0.5 in the limit of small E1 (with double hole level width Gamma (KL2,3)). The measured shift shows this functional behaviour below a certain excess energy E1 approximately=1 keV but assumes a constant value of in =(76+or-12) meV above E1. The experimental error is kept small by using a neighbouring diagram line as reference line with a PCI shift well known. Furthermore the authors give a first identification of 'final-state' satellite lines of the Ne K Auger spectrum.