#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"
  supertype:  #natural_process__naturalproces__natural_action__naturalaction__action__activity  a process existing in or produced by nature (rather than by the intent of human beings); "the action of natural forces"; "volcanic activity"
  subtype:  #emission  the release of electrons from parent atoms
     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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