On the validity of the electron transfer model in photon emission from ion bombarded vanadium surfaces M. Ait El Fqih, A. El Boujlaïdi, R. Jourdani and A. Kaddouri Eur. Phys. J. D, 63 1 (2011) 97-102 Published online: 17 May 2011 DOI: 10.1140/epjd/e2011-10614-6