Electron field emission from large-area cathodes: evidence for the projection model
Field emission from two kinds of emitters has been studied: intentionally introduced particles of controlled geometry; and sites produced by intentional mechanical damage to the cathode surface. The size of particles seems to play no role in their threshold field, but their shapes are a determinant...
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| Veröffentlicht in: | Journal of physics. D, Applied physics Applied physics, 1994-05, Vol.27 (5), p.1038-1045 |
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| container_end_page | 1045 |
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| container_issue | 5 |
| container_start_page | 1038 |
| container_title | Journal of physics. D, Applied physics |
| container_volume | 27 |
| creator | Jimenez, M Noer, R J Jouve, G Jodet, J Bonin, B |
| description | Field emission from two kinds of emitters has been studied: intentionally introduced particles of controlled geometry; and sites produced by intentional mechanical damage to the cathode surface. The size of particles seems to play no role in their threshold field, but their shapes are a determinant factor, since spherical particles do not emit for fields up to 120 MV m\+-1\-. The method of creation of damage sites, and the similarity of their emission on Nb and Au substrates, suggest the possibility that emission comes from geometrical protrusions. A model of superimposed geometrical protrusions is proposed to explain the enhanced field emission behaviour of this particular type of surface defect. (Original abstract) |
| doi_str_mv | 10.1088/0022-3727/27/5/023 |
| format | Article |
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The size of particles seems to play no role in their threshold field, but their shapes are a determinant factor, since spherical particles do not emit for fields up to 120 MV m\+-1\-. The method of creation of damage sites, and the similarity of their emission on Nb and Au substrates, suggest the possibility that emission comes from geometrical protrusions. A model of superimposed geometrical protrusions is proposed to explain the enhanced field emission behaviour of this particular type of surface defect. 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(Original abstract)</description><subject>Applied sciences</subject><subject>Condensed matter: electronic structure, electrical, magnetic, and optical properties</subject><subject>Electron and ion emission by liquids and solids; impact phenomena</subject><subject>Exact sciences and technology</subject><subject>Field emission, ionization, evaporation, and desorption</subject><subject>Metals. 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| ispartof | Journal of physics. D, Applied physics, 1994-05, Vol.27 (5), p.1038-1045 |
| issn | 0022-3727 1361-6463 |
| language | eng |
| recordid | cdi_pascalfrancis_primary_4060624 |
| source | IOP Publishing Journals; Institute of Physics (IOP) Journals - HEAL-Link |
| subjects | Applied sciences Condensed matter: electronic structure, electrical, magnetic, and optical properties Electron and ion emission by liquids and solids impact phenomena Exact sciences and technology Field emission, ionization, evaporation, and desorption Metals. Metallurgy Physics |
| title | Electron field emission from large-area cathodes: evidence for the projection model |
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