Difference between revisions of "Appearance energy"

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=Other versions=
 
=Other versions=
 
 
{{Def2|
 
The minimum energy that must be imparted to an atom or molecule to produce a specified ion. The term [[appearance potential]] is not recommended.
 
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{{orange|
 
The minimum energy that must be imparted to an atom, molecule, radical or other molecular entities to produce a specified ion. The term 'appearance potential' is not recommended.
 
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PAC, 1991, 63, 1541 ([[Recommendations for nomenclature and symbolism for mass spectroscopy]] (including an appendix of terms used in vacuum technology). (Recommendations 1991)) on page 1546
 
PAC, 1991, 63, 1541 ([[Recommendations for nomenclature and symbolism for mass spectroscopy]] (including an appendix of terms used in vacuum technology). (Recommendations 1991)) on page 1546
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{{asms|
 
Endothermicity of process AB+  ?  A+ + B
 
 
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Revision as of 19:12, 11 October 2012


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Other versions

Gold Book

GOLD BOOK DEFINITION

IUPAC. Compendium of Chemical Terminology, 2nd ed. (the Gold Book). Compiled by A. D. McNaught and A.Wilkinson. Blackwell Scientific Publications, Oxford (1997).

Appearance energy

http://goldbook.iupac.org/A00421.html

Refers to ionization of a molecule or atom by electron collision or photon absorption. In mass spectrometry it has often been reported as the voltage which corresponds to the minimum energy of the electrons in the ionizing beam necessary for the production of a given fragment ion. In photoionization it is the minimum energy of the quantum of light which produces ionization of the absorbing molecule.

Source:

PAC, 1990, 62, 2167 (Glossary of atmospheric chemistry terms (Recommendations 1990)) on page 2175

PAC, 1991, 63, 1541 (Recommendations for nomenclature and symbolism for mass spectroscopy (including an appendix of terms used in vacuum technology). (Recommendations 1991)) on page 1546

IUPAC Gold Book
Index of Gold Book Terms