English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT

Released

Journal Article

Emission properties of electron point sources

MPS-Authors
/persons/resource/persons211638

Grunze,  M.
Cellular Biophysics, Max Planck Institute for Medical Research, Max Planck Society;

Fulltext (restricted access)
There are currently no full texts shared for your IP range.
Fulltext (public)
There are no public fulltexts stored in PuRe
Supplementary Material (public)
There is no public supplementary material available
Citation

Müller, H., Völkel, B., Hofmann, M., Wöll, C., & Grunze, M. (1993). Emission properties of electron point sources. Ultramicroscopy, 50(1), 57-64. doi:10.1016/0304-3991(93)90090-K.


Cite as: https://hdl.handle.net/21.11116/0000-0001-9D89-4
Abstract
Emission properties and stability of ultrasharp 〈111〉-oriented tungsten tips were studied in a combined field ion/electron microscope and with an electron energy analyzer. In particular the divergence angle ϕ of the emitted electrons is important for novel developments in electron microscopy. It is found that this divergence angle depends only weakly on the geometry of the ultimate tip (monomer, trimer) but shows a strong variation with overall tip radius, with dull tips providing smaller divergence angles. For emission currents up to 100 nA we found only a slight dependence of the divergence angle on current. At higher currents, however, we observed a distinct increase of this angle, which is attributed to Coulomb interactions between the electrons. The energy distribution of the field-emitted electrons showed only weak deviations from standard field-emission theory.