Research output: Contribution to journal › Article › peer-review
Surface reconstruction of a field electron emitter. / Nikiforov, K. A.; Egorov, N. V.; Shen, Che Chou.
In: Journal of Surface Investigation, Vol. 3, No. 5, 10.2009, p. 833-839.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Surface reconstruction of a field electron emitter
AU - Nikiforov, K. A.
AU - Egorov, N. V.
AU - Shen, Che Chou
PY - 2009/10
Y1 - 2009/10
N2 - The surface and emission images of a metal field's electron cathode in the form of a tip are simulated. The surface structure is calculated in the thin-shell and broken-bond (local-environment) models for the perfect crystal lattice. The cathode shape and macroscopic electric field are represented by the sphere-on-cone model. The amplification of a local electric field is the adjustable parameter of the model. The method of determination of the emitter tip's crystal faces based on the analysis of the surface atoms' environment geometry is proposed. It is shown that it is enough to restrict the consideration of geometric environment by the fifth order of the nearest neighbors for the emitter radius of 100-1000 lattice parameters (31.6-316 nm for the tungsten). The crystallographic model of work function anisotropy in the broken-bond approach is used: the local work function's value is set in accordance with Miller indices of the face containing this area. The model adequacy is corroborated by the comparison of current-voltage characteristics and emission images with the data of the natural experiment.
AB - The surface and emission images of a metal field's electron cathode in the form of a tip are simulated. The surface structure is calculated in the thin-shell and broken-bond (local-environment) models for the perfect crystal lattice. The cathode shape and macroscopic electric field are represented by the sphere-on-cone model. The amplification of a local electric field is the adjustable parameter of the model. The method of determination of the emitter tip's crystal faces based on the analysis of the surface atoms' environment geometry is proposed. It is shown that it is enough to restrict the consideration of geometric environment by the fifth order of the nearest neighbors for the emitter radius of 100-1000 lattice parameters (31.6-316 nm for the tungsten). The crystallographic model of work function anisotropy in the broken-bond approach is used: the local work function's value is set in accordance with Miller indices of the face containing this area. The model adequacy is corroborated by the comparison of current-voltage characteristics and emission images with the data of the natural experiment.
UR - http://www.scopus.com/inward/record.url?scp=76349115322&partnerID=8YFLogxK
U2 - 10.1134/S1027451009050280
DO - 10.1134/S1027451009050280
M3 - Article
AN - SCOPUS:76349115322
VL - 3
SP - 833
EP - 839
JO - ПОВЕРХНОСТЬ. РЕНТГЕНОВСКИЕ, СИНХРОТРОННЫЕ И НЕЙТРОННЫЕ ИССЛЕДОВАНИЯ
JF - ПОВЕРХНОСТЬ. РЕНТГЕНОВСКИЕ, СИНХРОТРОННЫЕ И НЕЙТРОННЫЕ ИССЛЕДОВАНИЯ
SN - 1027-4510
IS - 5
ER -
ID: 9448925