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Open Access Publications from the University of California

The approach curve method for large anode-cathode distances

  • Author(s): Mammana, Victor P.
  • Monteiro, Othon R.
  • Fonseca, Leo R.C.
  • et al.

An important technique used to characterize field emission is the measurement of the emitted current against electric field (IxE). In this work we discuss a procedure for obtaining IxE data based on multiple approach curves. We show that the simulated features obtained for an idealized uniform surface matches available experimental data for small anode-cathode distances, while for large distances the simulation predicts a departure from the linear regime. We also discuss the shape of the approach curves for large anode-cathode distances for a cathode made of carbon nanotubes.

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