1. S.
Bertram, J. Appl. Phys.
13, 496 (1942).JAPIAU0021-8979
2. J.
Fink and E.
Kisker, Rev. Sci. Instrum.
51, 918 (1980).RSINAK0034-6748
3. P. Grivet, Electron Optics
(Pergamon, Oxford, 1965).
4. The program as described here is a conversion of
the program originally written in Algol 60 [E. Kisker, thesis, Hamburg, 1972
(unpublished)] to “Microsoft” BASIC, as used in the “PET” and other “personal”
computers. Special attention has been given to optimize speed, resulting in the compact
listing. The following versions of the program are presently available: The
FORTRAN version (Ref. 2) which includes a lens‐voltage optimization procedure,
the Algol 60 version (on request from the author), and the Basic program as described
here. A compilation into MC 6502 machine language which increases the speed by a factor of
510 is in preparation.
5. E.
Kisker, Z. Phys.
256, 121 (1972).ZEPYAA0044-3328