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Physical Review B
Volumn 46, Issue 8, 1992, Pages 4874-4883
Density-gradient analysis of field emission from metals
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[No Author keywords available]
Indexed keywords

EID: 0000274560     PISSN: 01631829     EISSN: None     Source Type: Journal    
DOI: 10.1103/PhysRevB.46.4874     Document Type: Article
Times cited : (23)
References (58)
  • 24
    • 84927822872 scopus 로고    scopus 로고
    • We note that a nonequilibrium version of Kohn-Sham theory has recently been developed;
  • 36
    • 84927822871 scopus 로고    scopus 로고
    • This may not hold for metals whose conduction electron densities are very low. Also, this is not true far from the cathode, but there the single-electron image force—now a good approximation—is negligible compared with the applied field.
  • 37
    • 84927822870 scopus 로고    scopus 로고
    • These statements concern primarily static corrections. It may well be that dynamic screening effects (e.g., see Ref. 18 and papers referenced therein) are significant especially at higher fields. For this paper, we assume they are not.
  • 42
    • 84927822869 scopus 로고    scopus 로고
    • It should be noted that their work is less explicitly macroscopic than ours both in formulation (they model probability-density fluid) and in application (they study proton–He-atom collisions).
  • 43
    • 84927822868 scopus 로고    scopus 로고
    • Underlying the approach is a continuum assumption, i.e., in some sense, the space scales of interest are large compared with the spacing between ``discrete elements.'' The precise limits set by this requirement, under any circumstance uncertain, are especially unclear here, where the same equations can be both macroscopically and microscopically valid (Ref. 25).
  • 44
    • 22744447543 scopus 로고
    • Density-gradient approximations have a long history in the context of Thomas-Fermi theory, beginning with the work of
    • (1935) Z. Phys. , vol.96 , pp. 431
    • Weizsäcker, C. v.1
  • 45
    • 84927822867 scopus 로고    scopus 로고
    • With the development of the Kohn-Sham equations (Ref. 8), such approaches were essentially abandoned for ground-state calculations. For nonequilibrium problems, however, density-gradient-based theories akin to the approach of this paper remain in use (e.g., Ref. 25).
  • 51
    • 84927822866 scopus 로고    scopus 로고
    • in Computational Electronics, edited by K. Hess, J.-P. Leburton, and U. Ravaioli (Kluwer, Boston, 1990), p. 255.

* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.