Ionization efficiency

IUPAC RECOMMENDATIONS 2013
Ionization efficiency
Ratio of the number of ions generated to the number of molecules consumed in the ion source of a mass spectrometer. Note 1: The method for estimating the number of molecules consumed must always be clearly stated. Note 2: In some older literature the ionization efficiency is defined as the fraction of electrons or photons that ionize a fixed number of molecules. The ionization efficiency varies with both the energy and the number of the ionizing entities, and in such cases an ionization efficiency curve can provide useful thermochemical information. Note 3: The ionization efficiency strictly refers to the ionization events in the ion source. The fraction of molecules that are ionized and are subsequently detected also depends on the detection sensitivity of the instrument used.
Related Term(s):
Reference(s): Revised from IUPAC. Analytical Division. Compendium of Analytical Nomenclature (the Orange Book). Definitive Rules, 1979. Compiled by J. Inczédy, T. Lengyel, A. M. Ure. Blackwell Scientific Publications, Oxford (1997). On-line corrected version: http://www.iupac.org /publications/analytical compendium (2000). IUPAC. Compendium of Chemical Terminology, 2nd ed. (the Gold Book). Compiled by A. D. McNaught and A.Wilkinson. Blackwell Scientific Publications, Oxford (1997). XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. using additional information from R. D. Smith, J. A. Loo, C. G. Edmonds, C. J. Barinaga, H. R. Udseth. Anal. Chem. 62, 882 (1990). (http://dx.doi.org/10.1021/ac00208a002 ) K. Dreisewerd. Chem. Rev. 103, 395 (2003). (http://dx.doi.org/10.1021/cr010375i )
From Definitions of Terms Relating to Mass Spectrometry (IUPAC Recommendations 2013); DOI: 10.1351/PAC-REC-06-04-06 © IUPAC 2013.
Index of Recommended Terms

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Orange Book

ORANGE BOOK DEFINITION IUPAC. Analytical Division. Compendium of Analytical Nomenclature (the Orange Book). Definitive Rules, 1979 (see also Orange Book 2023)
Ionization efficiency
It is the ratio of the number of ions formed to the number of electrons or photons used.
IUPAC 1997 Orange Book Chapter 12
Index of Orange Book Terms

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).
Ionization efficiency
http://goldbook.iupac.org/I03196.html The ratio of the number of ions formed to the number of electrons or photons used in an ionization process. Source: 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 1548
IUPAC Gold Book
Index of Gold Book Terms