The invention concerns a device comprising at least one field effect electron
source within a sealed structure, which encompasses an internal space that contains
a reducing gas whose purpose is to prevent oxidation of the emissive material of
the electron source, whereby the reducing gas is a gas with the formula NxHy
where x=1 or 2 and y=3 or 4, and which is advantageously under a pressure of between
10-8 and 10-1 mbar. It also concerns manufacturing processes
for such a device and apparatuses for implementing these processes.
