%0 Journal Article %T Electron impact single ionization of the He-isoelectronic sequence %A Frapiccini %A A. L. %A Rodriguez %A K. V. %A Gasaneo %A G. %A Otranto %A S. %J Brazilian Journal of Physics %D 2007 %I Scientific Electronic Library Online %R 10.1590/S0103-97332007000700007 %X in this work, triply differential cross sections for single electron emission due to electron impact on the he-isoelectronic sequence are calculated by using a born-c3 model. the influence of the nuclear charge on the angular distributions is analyzed. the validity of a scaling law initially derived in the framework of photo-double-ionization is discussed. %K electron collisions %K single ionization %K fully differential cross sections %K he-isoelectronic sequence. %U http://www.scielo.br/scielo.php?script=sci_abstract&pid=S0103-97332007000700007&lng=en&nrm=iso&tlng=en