emission current

This method can be difficult to control at low emission currents.

In this case, the electron gun acceleration potential limits the emission current.

After flashing the emission current is high but unstable.

The appropriate width of the strip depends on the highest required value of emission current.

The emission currents are made up of pulses with durations of several ms.

The electric field lowers the surface barrier by an amount ΔW, and increases the emission current.

Applying the field causes lowering of the barrier, and thus enhances the emission current in thermionic emission.

Procedures were (and are) used to round and smooth the surfaces of electrodes that might generate unwanted field electron emission currents.

It was also difficult to understand why those emission currents generated by applying high electric fields to metals at room temperature were almost independent of temperature.

A new source capable of being regenerated has been tested to give a high emission current of 10 microamps and a half life of 13 days.

In this case, the emission current is regulated by the thermionic emission process, given by the Richardson Dushman equation.

This microscope is equipped with Hitachi's patented "Dual-Bias" which allows extremely high emission currents at acceleration voltages of 5 kV and lower.

Greenhouse Gas Emissions Current Level and Trends Since 1990, Canadian GHG emissions have increased by 20.1 per cent.

Where voltage-drop effects occur, then the theory of the emission current may, to a greater or lesser extent, become theory that involves internal transport effects, and may become very complex.

The solution was to add another grid between the screen grid and the main anode, called the suppressor grid (since it suppressed secondary emission current toward the screen grid).

There are also emission regimes where the internal electrons are not in thermodynamic equilibrium and the emission current is, partly or completely, determined by the supply of electrons to the emitting region.

Greenhouse gas emissions Current performance and trends Since 1990, Canadian greenhouse gas (GHG) emissions have risen by 24.0 per cent, steadily increasing the distance from Canada’s Kyoto targets.

It was found that the amount of secondary emission current from the plate varied unpredictably from tube to tube, and also within a single tube over its operating life; eventually it would stop oscillating.

The emission current varies strongly with the local work function in accordance with the Fowler-Nordheim equation; hence, the FEM image displays the projected work function map of the emitter surface.

The surface property of primary interest is the work function, which is the barrier that limits electron emission current from the surface and essentially is the heat of vaporization of electrons from the surface.

In physics, the Dember effect is when the electron current from a cathode subjected to both illumination and a simultaneous electron bombardment is greater than the sum of the photoelectric current and the secondary emission current .

This equation is relatively accurate for electric field strengths lower than about 10 V m. For electric field strengths higher than 10 V m, so-called Fowler-Nordheim (FN) tunneling begins to contribute significant emission current.

Response Ontario SO2 emissions Current projections indicate that after an initial modest increase in 2005, SO2 emissions in Ontario will fall by 2010, before any reductions realized from the province's recently announced program aimed at further SO2 emissions reductions.