Difference between revisions of "Charge inversion mass spectrum"

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The measurement of the relative abundance of ions that result from a [[charge inversion reaction]] as a function of ''[[m/z]]''.
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|def=Plot of the relative abundances of [[ion]]s that result from a [[charge inversion reaction]] as a function of ''[[m/z]]''.
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Charge inversion processes of the types: M<sup>+</sup> + X<sup>-</sup>, M - + X<sup>2+</sup> or M - + X -</sup> M<sup>+</sup> + X + 2e respectively, occurring in a [[collision cell]] (containing a gas X) located in a [[field-free zone]] preceding a magnetic and electric sector combination placed in either order, may be detected as follows: if the instrument slits are wide and if the connections to the two sectors, appropriate to transmission of either positive or negative main-beam ions, are simply reversed, the negative or positive product ions respectively will be transmitted. If the magnetic field is scanned a spectrum of such ions will be obtained and this is termed a charge-inversion spectrum. These are sometimes referred to as -E and +E spectra. Note: The terms , E /2,-E or +E mass spectrumshould not be used without prior explanation of their meaning.
+
Charge inversion processes of the types: M<sup>+</sup> + X -> M <sup>-</sup> + X<sup>2+</sup> or M - + X -> M<sup>+</sup> + X + 2e respectively, occurring in a [[collision cell]] (containing a gas X) located in a [[field-free zone]] preceding a magnetic and electric sector combination placed in either order, may be detected as follows: if the instrument slits are wide and if the connections to the two sectors, appropriate to transmission of either positive or negative main-beam ions, are simply reversed, the negative or positive product ions respectively will be transmitted. If the magnetic field is scanned a spectrum of such ions will be obtained and this is termed a charge-inversion spectrum. These are sometimes referred to as -E and +E spectra. Note: The terms 2E, E/2,-E or +E mass spectrum should not be used without prior explanation of their meaning.
 
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Charge inversion processes of the types:
 
Charge inversion processes of the types:
  
M<sup>+</sup> + X<sup>-</sup> ? M - + X<sup>2+</sup>
+
M<sup>+</sup> + X -> M<sup>-</sup> + X<sup>2+</sup>
  
 
or
 
or
  
M - + X -</sup> ? M<sup>+</sup> + X + 2e  
+
M - + X ->  M<sup>+</sup> + X + 2e  
  
 
respectively, occuring in a collision cell (containing a gas, X) located in a field-free region preceding a magnetic and electric sector combination placed in either order, may be detected as follows. If the instrument slits are wide, and if the connections to the two sectors, appropriate to transmission of either positive or negative main-beam ions, are simply reversed, the negative or positive product ions of the two processes, respectively, will be transmitted. If the magnetic field is scanned, a spectrum of such product ions will be obtained, and this spectrum is called a charge-inversion mass spectrum. These spectra are sometimes referred to as ?E and +E spectra, respectively. The terms '2E, E/2, ?E or +E mass spectrum' should not be used without prior explanation of the meaning 2E, E, +E or ?E.
 
respectively, occuring in a collision cell (containing a gas, X) located in a field-free region preceding a magnetic and electric sector combination placed in either order, may be detected as follows. If the instrument slits are wide, and if the connections to the two sectors, appropriate to transmission of either positive or negative main-beam ions, are simply reversed, the negative or positive product ions of the two processes, respectively, will be transmitted. If the magnetic field is scanned, a spectrum of such product ions will be obtained, and this spectrum is called a charge-inversion mass spectrum. These spectra are sometimes referred to as ?E and +E spectra, respectively. The terms '2E, E/2, ?E or +E mass spectrum' should not be used without prior explanation of the meaning 2E, E, +E or ?E.
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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 1551
 
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 1551
 
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== See also ==
 
*[[Linked scan]]
 
  
 
[[Category:Reactions]]
 
[[Category:Reactions]]
 
[[Category:M/z Separation]]
 
[[Category:M/z Separation]]
{{DEFAULTSORT:Charge Inversion Mass Spectrum}}
 
[[Category:Orange Book term]]
 

Latest revision as of 19:36, 4 November 2013

IUPAC RECOMMENDATIONS 2013
Charge inversion mass spectrum
Plot of the relative abundances of ions that result from a charge inversion reaction as a function of m/z.
Related Term(s):
Reference(s):

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.

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

 




Orange Book

ORANGE BOOK DEFINITION

IUPAC. Analytical Division. Compendium of Analytical Nomenclature (the Orange Book). Definitive Rules, 1979.

Charge inversion mass spectrum

Charge inversion processes of the types: M+ + X -> M - + X2+ or M - + X -> M+ + X + 2e respectively, occurring in a collision cell (containing a gas X) located in a field-free zone preceding a magnetic and electric sector combination placed in either order, may be detected as follows: if the instrument slits are wide and if the connections to the two sectors, appropriate to transmission of either positive or negative main-beam ions, are simply reversed, the negative or positive product ions respectively will be transmitted. If the magnetic field is scanned a spectrum of such ions will be obtained and this is termed a charge-inversion spectrum. These are sometimes referred to as -E and +E spectra. Note: The terms 2E, E/2,-E or +E mass spectrum should not be used without prior explanation of their meaning.

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).

Charge inversion mass spectrum

http://goldbook.iupac.org/C00992.html

Charge inversion processes of the types:

M+ + X -> M- + X2+

or

M - + X -> M+ + X + 2e

respectively, occuring in a collision cell (containing a gas, X) located in a field-free region preceding a magnetic and electric sector combination placed in either order, may be detected as follows. If the instrument slits are wide, and if the connections to the two sectors, appropriate to transmission of either positive or negative main-beam ions, are simply reversed, the negative or positive product ions of the two processes, respectively, will be transmitted. If the magnetic field is scanned, a spectrum of such product ions will be obtained, and this spectrum is called a charge-inversion mass spectrum. These spectra are sometimes referred to as ?E and +E spectra, respectively. The terms '2E, E/2, ?E or +E mass spectrum' should not be used without prior explanation of the meaning 2E, E, +E or ?E.

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 1551

IUPAC Gold Book
Index of Gold Book Terms