Electron field emission properties of tetrahedral amorphous carbon films of
different thicknesses have been studied. The experimental results indicate
that there exists no close relationship between threshold electric field a
nd film thickness. Different field emission models are used to examine the
experimental results in order to explain the thickness-independent electron
field emission properties. (C) 2000 American Institute of Physics. [S0003-
6951(00)01102-5].