ION DETECTION TECHNIQUES APPLIED TO RYDBERG ATOMS IN EXTERNAL FIELDS F. Penent, C. Chardonnet, D. Delande, F. Biraben et J. C. GayJ. Phys. Colloques, 44 C7 (1983) C7-193-C7-208DOI: https://doi.org/10.1051/jphyscol:1983716