FIELD-ASSISTED PHOTODESORPTION OF IONS FROM METAL AND SEMICONDUCTOR SURFACES S. JAENICKE, A. CISZEWSKI, W. DRACHSEL, U. WEIGMANN, T.T. TSONG, J.R. PITTS, J. H. BLOCK and D. MENZEL J. Phys. Colloques, 47 C7 (1986) C7-343-C7-348 DOI: 10.1051/jphyscol:1986759