On the observation of the fine structure effect in non-relativistic (e, 2e) processes M. Kampp, S. Kawano, P. J.P. Roche, J. Rasch, D. H. Madison, H. R.J. Walters and C. T. Whelan Eur. Phys. J. D, 29 1 (2004) 17-19 Published online: 10 February 2004 DOI: 10.1140/epjd/e2004-00014-6