Structural and chemical alteration of crystalline olivine under low energy He+ irradiation K. Demyk, Ph. Carrez, H. Leroux, P. Cordier, A. P. Jones, J. Borg, E. Quirico, P. I. Raynal and L. d'Hendecourt A&A, 368 3 (2001) L38-L41 Published online: 15 March 2001 DOI: 10.1051/0004-6361:20010208