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A NEW CLASS OF LOW‐PRESSURE ARC COLUMNS WITH POSITIVE V‐I CHARACTERISTICS
1.See e.g. H. Fetz, Ann. Physik 37, 1 (1940);
1.G. Wehner, Ann. Physik 41, 501 (1942);
1.A. Haug, Z. angew. Phys. 1, 23 (1949);
1.and G. Francis, Encyclopedia of Physics (Springer, Berlin, 1956) Vol. XXII, section 94.
2.C. Kenty, Phys. Rev. 126, 1235 (1962).
3.L. S. Frost and A. V. Phelps, Phys. Rev. 136, A1538 (1964). It should be noted that the values for the drift velocities given here can at best be first approximations to the values to be used in an active discharge; for a rough estimate as we want to give, they should suffice.
4.It should be noted that in similar systems but‐due to a complete lack of insight‐under much less favorably defined circumstances very tiny positive parts in V‐I characteristics have been observed many years ago by H. Alterthum and A. Lompe, Ann. Physik 31, 1 (1938).
5.Direct measurements of the gradient by Dr. J. Waszink and J. van Laren confirmed the picture given here (to be published).
6.This was first fully realized in a discussion with Dr. Waszink.
7.If the experiments are performed at ac very similar phenomena are observed but the “hot” region now generally starts to appear in the middle of the column.
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