Because electrons have a charge, electrons escaping by tunnel ionization come and go to the atom (molecule) in every half period.

Just as electrons can move around in a metal but cannot escape the metal, water in a pipe can move around but cannot get out.

However, all but a few of these bands lie at energies so high that any electron that attains those energies will escape from the solid.

Ejected electrons can escape only from a depth of approximately 3 nanometers or less, making electron spectroscopy most useful to study surfaces of solid materials.

Individual electrons can escape by Fowler-Nordheim tunneling from many materials in various different circumstances.

These diffracted electrons can escape the material and some will collide and excite the phosphor causing it to fluoresce.

Thus the electrons would either escape from the atom altogether or would spiral into the nucleus.

For high , the level of energy becomes so high that the electron can easily escape from the atom.

Enough electrons escape the source region to ensure that the plasma in the exhaust is neutral overall.

Some electrons penetrate the sample surface and escape into vacuum.