TY - JOUR AU - C Kuyatt AU - D DiChio AU - S Natali C2 - Journal of Vacuum Science and Technology DA - 1973-11-01 LA - en M1 - 10 PB - Journal of Vacuum Science and Technology PY - 1973 TI - Focal Properties of the Two-Tube Electrostatic Lens for large Voltage Ratios ER -