Metastable ion: Difference between revisions

Revision as of 21:10, 17 June 2013

Metastable ion
IUPAC RECOMMENDATIONS 2013
Ion formed with internal energy higher than the threshold for dissociation but with a lifetime great enough to allow it to exit the ion source and enter the mass analyzer region where it dissociates before detection.
Related Term(s):
Reference(s): IUPAC. Analytical Division. Compendium of Analytical Nomenclature (the Orange Book). Definitive Rules, 1979. Compiled by J. Inczdy, 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.
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

Metastable ion
ORANGE BOOK DEFINITION IUPAC. Analytical Division. Compendium of Analytical Nomenclature (the Orange Book). Definitive Rules, 1979 (see also Orange Book 2023)
An ion which is formed with sufficient excitation to dissociate spontaneously during its flight from the ion source to the detector.
IUPAC 1997 Orange Book Chapter 12
Index of Orange Book Terms

Metastable ion
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).
http://goldbook.iupac.org/M03874.html An ion which is formed with sufficient excitation to dissociate spontaneously during its flight from the ion source to the detector. 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 1549
IUPAC Gold Book
Index of Gold Book Terms

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-{{Def2|
+{{Final
-An ion that is formed with internal energy higher than the threshold for dissociation but with a lifetime great enough to allow it to exit the [[ion source]] and enter the [[mass spectrometer]] where it dissociates before detection.
+|acronym=
-}}
+|def=[[Ion]] formed with internal energy higher than the threshold for dissociation but with a lifetime great enough to allow it to exit the [[ion source]] and enter the [[mass analyzer]] region where it dissociates before detection.
+|rel=
-{{rev5|
+|ref={{obgb}}
-An ion formed with internal energy higher than the threshold for dissociation but with a lifetime great enough to allow it to exit the ion source and enter the mass analyzer where it dissociates before detection.
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-#[[Gold Book]]
-#[[Orange Book]]
 }}
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 '''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 1549
-}}
-{{asms|
-Ion that fragments slowly after emergence from the ion source but before it reaches the detector; in sector instruments, metastable ions give rise to signals which appear at  unique m/z values related to the parent and product ion masses.
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