#emission  the release of electrons from parent atoms
  supertype:  release.natural_process  a process that liberates or discharges something; "there was a sudden release of oxygen"; "the release of iodine from the thyroid gland"
  subtype:  photoemission  emission of photoelectrons (especially from a metallic surface)
  subtype:  field_emission__fieldemission  the emission of electrons that are stripped from parent atoms by a high electric field
  subtype:  photoelectric_emission__photoelectricemission  the release or absorption of quanta above a certain energy level
  subtype:  secondary_emission__secondaryemission  the emission of electrons from a surface that is bombarded by higher energy primary electrons
  subtype:  thermionic_emission__thermal_emission__thermalemission  the emission of electrons from very hot substances

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