Chemical Sciences: A Manual for CSIR-UGC National Eligibility Test for Lectureship and JRF/Appearance energy
Appearance energy (also known as appearance potential) is the minimum energy that must be supplied to a gas phase atom or molecule in order to produce an ion. In electron ionization, this is the minimum electron energy that produces an ion. In photoionization it is the minimum photon energy.
- International Union of Pure and Applied Chemistry. "Appearance energy". Compendium of Chemical Terminology Internet edition.
- Kerwin, Larkin; Marmet, Paul (1960), "Recent Appearance Potential Measurements Using an Electrostatic Electron Selector", Journal of Applied Physics 31: 2071, doi:10.1063/1.1735504