Cathodoluminescence microanalysis of porous GaP and InP structures I. M. Tiginyanu, S. Langa, L. Sirbu, E. Monaico, M. A. Stevens-Kalceff and H. Föll Eur. Phys. J. Appl. Phys., 27 1-3 (2004) 81-84 Published online: 15 July 2004 DOI: 10.1051/epjap:2004043