. Electron microscopy; proceedings of the Stockholm Conference, September, 1956 . Fig. 5. Reflection units using small permanent magnets. ^ = 2 mo U* BAz)dz. Here c is the charge of an electron, /?/„ its mass, Bx the component of the induction normal to the plane of motion. - measures in the initial direction, the field extends between, r„ and r,. Fig. 5d illustrates the principle of a deflection unit working with small flat AInico magnets. Fig. 5a shows the unit assembled and Fig. 5/) the magnets, the magnetic link and the moimt. With these magnets an angle of deflection of I 1 can be obtaine
. Electron microscopy; proceedings of the Stockholm Conference, September, 1956 . Fig. 5. Reflection units using small permanent magnets. ^ = 2 mo U* BAz)dz. Here c is the charge of an electron, /?/„ its mass, Bx the component of the induction normal to the plane of motion. - measures in the initial direction, the field extends between, r„ and r,. Fig. 5d illustrates the principle of a deflection unit working with small flat AInico magnets. Fig. 5a shows the unit assembled and Fig. 5/) the magnets, the magnetic link and the moimt. With these magnets an angle of deflection of I 1 can be obtained. It may only be mentioned here that two permanent magnets of this type can be arranged in a way that they form a magnetic quadrupole and so have focus- sing properties. Lenses of both positive and negative focal length in the order of 5-6 mm could be realized with the small magnets described above. The very preliininary experiments were carried out with the help of a device shown in fig. 5c, which has two or four degrees of freedom. For many fruitful discussions the authors wish to thank Dr. Lenz. The technical designs of the lens systems lay in the hands of Ing. J. Huppertz. References 1. VON BORRIES, B., Kolloid-Z. 114, 164-167 (1949). 2. — Z. wiss. Mikioskop. 60, 317-358 (1952). 3. VON BoRRiES, B. and Lanuner, G., Comples rendus du colloque CNRS a Toulouse, April 1955, pp. 285-295 (1956). 4. VON BoRRiES, B. and Lenz, F., Optik 13, 264-276 (1956). 5. Ito, K., Ito,T. and Watanabe, M., /. Electron-microscopy (Japan) 2, 10-14 (1954). 6. Langner, G. Optik 12, 554-562 (1955). 7. Langner, G. and Lenz , F., Optik 11, 171-180 (1954). 8. Reisner, L H. and Dornfeld, E. G., /. Appl. Phys. 21, 1131-1139 (1950). 9. Lenz, F., Z. ong. Plus. 8, 492-496 (1956). Uber magnetostatische Linsenanordnungen mit mechanischen Reeeleliedern^ K. MiJLLER Siemens & Halske AG, Wernerwerk fiir Mefitechnik, Berlin-Siemensstadt IM Rahmen einer Entwicklung magnetostatischer Elektronenlinsen h
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