Secondary emission in physics is a phenomenon where primary incident particles of sufficient energy, when hitting a surface or passing through some material, induce the emission of secondary particles. The primary particles are often charged particles like electrons or ions. If the secondary particles are electrons, the effect is termed secondary electron emission. In this case, the number of secondary electrons emitted per incident particle is called secondary emission yield. If the secondary particles are ions, the effect is termed secondary ion emission.
Secondary emissive materials 
Commonly used secondary emissive materials include
- alkali antimonide
- beryllium oxide (BeO)
- magnesium oxide (MgO)
- gallium phosphide (GaP)
- gallium arsenide phosphide (GaAsP)
- lead oxide (PbO)
Photo multipliers and similar devices 
In a photomultiplier tube, one or more electrons are emitted from a photocathode and accelerated towards a polished metal electrode (called a dynode). They hit the electrode surface with sufficient energy to release a number of electrons through secondary emission. These new electrons are then accelerated towards another dynode, and the process is repeated several times, resulting in an overall gain ('electron multiplication') in the order of typically one million and thus generating an electronically detectable current pulse at the last dynodes.
Similar electron multipliers can be used for detection of fast particles like electrons or ions
Historic applications 
Special amplifying tubes 
In the 1930s special amplifying tubes were developed which deliberately "folded" the electron beam, by having it strike a dynode to be reflected into the anode. This had the effect of increasing the plate-grid distance for a given tube size, increasing the transconductance of the tube and reducing its noise figure. A typical such "orbital beam hexode" was the RCA 1630, introduced in 1939. Because the heavy electron current in such tubes damaged the dynode surface rapidly, their lifetime tended to be very short compared to conventional tubes.
Early computer memory tubes 
The first random access computer memory used a type of cathode ray tube called the Williams tube that used secondary emission to store bits on the tube face. Another random access computer memory tube based on secondary emission was the Selectron tube. Both were made obsolete by the invention of magnetic core memory.
Undesirable effects 
Secondary emission can be undesirable such as in the tetrode thermionic valve (tube). In this instance the positively charged screen grid can accelerate the electron stream sufficiently to cause secondary emission at the anode (plate). This can give rise to excessive screen grid current. It is also partly responsible for this type of valve (tube), particularly early types with anodes not treated to reduce secondary emission, exhibiting a 'negative resistance' characteristic. This side effect could be put to use by using some older valves (e.g., type 77 pentode) as dynatron oscillators.
See also 
- R. Kollath, Secondary electron emission of solids irradiated by electrons, Encyclopedia of Physics (ed. S. Flügge) Vol. 21, p. 232 - 303 (1956, in German)
- H. Semat, J.R. Albright, Introduction to Atomic and Nuclear Physics, 5th ed., ch. 4.12, Chapman and Hall, London (1972)