HYDROGEN IONS EMISSION UNDER FAST CHARGED PARTICLES : THE BEGINNING OF THE DESORPTION PROCESS E. F. DA SILVEIRA, M. G. BLAIN et E. A. SCHWEIKERTJ. Phys. Colloques, 50 C2 (1989) C2-79-C2-84DOI: https://doi.org/10.1051/jphyscol:1989215