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Vordurchschlagsphänomene der Feldemission im Nanosekundenbereich
Author(s) -
Jüttner B.,
Rohrbeck W.,
Puchkarov V. F.
Publication year - 1977
Publication title -
beiträge aus der plasmaphysik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.531
H-Index - 47
eISSN - 1521-3986
pISSN - 0005-8025
DOI - 10.1002/ctpp.19770170103
Subject(s) - nanosecond , materials science , common emitter , field electron emission , desorption , analytical chemistry (journal) , cathode , time constant , atomic physics , optoelectronics , chemistry , optics , physics , laser , adsorption , electrical engineering , organic chemistry , quantum mechanics , chromatography , engineering , electron
Variation of field emitters on Mo‐ and Cu‐cathodes were investigated by field emission microscopy after application of nanosecond voltage pulses. The emitters delivered emission currents with densities of more than 10 13 Am −2 without breakdown. Heating by these currents caused desorption and melting of emitter tips. From the desorption events resonance tunneling was deduced with typical UHV‐conditions. Melting caused blunting of the emitters. Hence sharp micro‐points exploded only by sufficiently fast heating (with time constants ≦ 1 ns) or by secondary effects due to contaminations. By introduction of air in the pressure region of 10 −4 ‐ 10 −3 Pa new emitting sites appear with time constants of about 10 −8 s, probably by formation of oxides.