As long as the emitter and collector were very close together, this should allow enough electrons or holes between them to allow conduction to start.

The energy slit can be adjusted so as to only allow electrons which have not lost energy to pass through to form the image.

Adjusting the slit to only allow electrons which have lost a specific amount of energy can be used to obtain elementally sensitive images.

As any two electrically charged particles separate, the electric fields between them diminish quickly, allowing (for example) electrons to become unbound from atomic nuclei.

Instead, it appears as if the material violates the Pauli exclusion principle, allowing electrons to simultaneously share quantum states.

The cell is connected to an electrical power supply, allowing electrons to migrate from the power supply to the electrolytic cell.

(They would be insulators, except they are perfectly crystallized so as to allow mobile electrons to not get trapped at defects.)

These trapped holes allow photo excited electrons to be available for chemisorption.

And finally, in the fourth stage, the tunneling barriers allow electrons to freely tunnel again.

A voltage is applied between the tip and the sample allowing electrons to tunnel between the two, resulting in a current.