MTT promises a highly spin-polarized electron source at room temperature.
The spatial coherence in in-line scheme is defined by the size of the electron source.
Thus Paschen's law is not valid if there are external electron sources.
In peroxidase reactions, the porphyrin molecule also serves as an electron source.
A separate electron source is required to keep the spacecraft electrically neutral.
It uses a planar electron source and no deflection (3).
Hydrogen sulfide is used as an electron source and carbon dioxide its carbon source.
Optical feedback has also been experimented with as an electron source, since a photocathode-phosphor cell will 'latch' when triggered, providing a steady stream of electrons.
Nitroethylene can act at the 2π electron source in a [4+2] cycloaddition.
Sulfur granules are especially common in bacteria that use hydrogen sulfide as an electron source.