Secondary electron emission begins when one electron hits a dynode inside a vacuum chamber and ejects electrons that cascade onto more dynodes and repeats the process over again. The dynodes are set up so that each time an electron hits the next one it will have an increase of about 100 electron Volts greater than the last dynode. Some advantages of using this include a response time in the picoseconds, a high sensitivity, and an electron gain of about 108 electrons. Tao, S., Chan, H., & van der Graaf, H. (2016). Secondary Electron Emission Materials for Transmission Dynodes in Novel Photomultipliers: A Review. Materials, 9(12), 1017. https://doi.org/10.3390/ma9121017
