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 mass spectrometry, it is accounted as the voltage to correspond for electron ionization. [1] This is the minimum electron energy that produces an ion.[2] In photoionization, it is the minimum photon energy of a photon that produces some ion signal. For example, the indene bromide ion (IndBr+) only loses bromine at an incident photon energy of 10.2 eV, so the product, indenyl, has an appearance energy of 10.2 eV.[3]

## See also

* Ionization energy

## References

1. ↑ IUPAC, Compendium of Chemical Terminology, 2nd ed. (the "Gold Book") (1997). Online corrected version:  (2006-) "Appearance energy". doi:10.1351/goldbook.A00421
2. ↑ Kerwin, Larkin; Marmet, Paul (1960), "Recent Appearance Potential Measurements Using an Electrostatic Electron Selector", Journal of Applied Physics 31 (12): 2071, doi:10.1063/1.1735504, Bibcode: 1960JAP....31.2071K
3. ↑ Hemberger, Patrick; Steinbauer, Michael; Schneider, Michael; Fischer, Ingo; Johnson, Melanie; Bodi, Andras; Gerber, Thomas (2010-04-15). "Photoionization of Three Isomers of the C 9 H 7 Radical" (in en). The Journal of Physical Chemistry A 114 (14): 4698–4703. doi:10.1021/jp9068569. ISSN 1089-5639. https://pubs.acs.org/doi/10.1021/jp9068569.

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