Linked scan: Difference between revisions
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, Replaced: == Related Terms == ‚Üí == See also ==, using AWB |
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== | == Orange Book Entry == | ||
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A scan in an instrument comprising two or more analysers in which two or more of the analyser fields are scanned simultaneously so as to preserve a predetermined relationship between parameters characterizing these fields. While these parameters are commonly field strengths, they may also be frequencies in analysers where alternating fields are employed. | A scan in an instrument comprising two or more analysers in which two or more of the analyser fields are scanned simultaneously so as to preserve a predetermined relationship between parameters characterizing these fields. While these parameters are commonly field strengths, they may also be frequencies in analysers where alternating fields are employed. | ||
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::This can be performed with a sector instrument incorporating at least one electric sector plus one magnetic sector. The accelerating voltage is fixed and the magnetic field, B, and the electric field, E, are scanned simultaneously so as to maintain B<sup>2</sup>/E constant. This constant value corresponds to the ratio of the two fields which transmits mainbeam ions of predetermined mass/charge ratio; these preselected main-beam ions are the fragment ions whose precursor ion spectrum is required. The fragmentation reactions thus observed occur in a field-free region traversed before the two sectors scanned in this way. The term 'E<sup>2</sup>/E linked scan????????????????????????? is not recommended. Note: other examples of linked scan should be defined in a similar way to the examples given here. | ::This can be performed with a sector instrument incorporating at least one electric sector plus one magnetic sector. The accelerating voltage is fixed and the magnetic field, B, and the electric field, E, are scanned simultaneously so as to maintain B<sup>2</sup>/E constant. This constant value corresponds to the ratio of the two fields which transmits mainbeam ions of predetermined mass/charge ratio; these preselected main-beam ions are the fragment ions whose precursor ion spectrum is required. The fragmentation reactions thus observed occur in a field-free region traversed before the two sectors scanned in this way. The term 'E<sup>2</sup>/E linked scan????????????????????????? is not recommended. Note: other examples of linked scan should be defined in a similar way to the examples given here. | ||
:[[Linked Scan at Constant E2/V|Linked Scan at Constant E<sup>2</sup>/V ]] | :[[Linked Scan at Constant E2/V|Linked Scan at Constant E<sup>2</sup>/V]] | ||
::This may be performed with a sector instrument incorporating at least one electric sector plus one magnetic sector. The electric sector field, E, and the accelerating voltage, V, are scanned simultaneously so as to maintain E<sup>2</sup>/V ratio at constant value equal to the value of this ratio that transmits the main beam ions through the electric sector. The magnetic sector field is set at a fixed value such that main-beam ions of a predetermined mass/charge ratio are transmitted by the magnetic sector; these preselected main-beam ions are the precursor ions whose fragment ion spectrum is required. The fragmentation reactions thus observed occur in a field-free region traversed before the two sectors scanned in this way. The term 'E<sup>2</sup>/V linked scan????????????????????????? is not recommmended. | ::This may be performed with a sector instrument incorporating at least one electric sector plus one magnetic sector. The electric sector field, E, and the accelerating voltage, V, are scanned simultaneously so as to maintain E<sup>2</sup>/V ratio at constant value equal to the value of this ratio that transmits the main beam ions through the electric sector. The magnetic sector field is set at a fixed value such that main-beam ions of a predetermined mass/charge ratio are transmitted by the magnetic sector; these preselected main-beam ions are the precursor ions whose fragment ion spectrum is required. The fragmentation reactions thus observed occur in a field-free region traversed before the two sectors scanned in this way. The term 'E<sup>2</sup>/V linked scan????????????????????????? is not recommmended. | ||
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== | == See also == | ||
*[[Linked Scan at Constant B2/E]] | *[[Linked Scan at Constant B2/E]] | ||
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== External | == External links == | ||
*[http://www3.interscience.wiley.com/cgi-bin/abstract/110441058/ABSTRACT A new linked scan for reversed geometry mass spectrometers (Article) ] | *[http://www3.interscience.wiley.com/cgi-bin/abstract/110441058/ABSTRACT A new linked scan for reversed geometry mass spectrometers (Article) ] | ||
[[Category: | [[Category:M/z Separation]] | ||
[[Category:Sequential m/z Separation]] | [[Category:Sequential m/z Separation]] | ||
{{DEFAULTSORT:Linked Scan}} | |||
Revision as of 14:53, 12 July 2009
Obsolete Template
Orange Book Entry
Orange Book
| ORANGE BOOK DEFINITION
IUPAC. Analytical Division. Compendium of Analytical Nomenclature (the Orange Book). Definitive Rules, 1979 (see also Orange Book 2023) |
| Linked scan |
|---|
|
A scan in an instrument comprising two or more analysers in which two or more of the analyser fields are scanned simultaneously so as to preserve a predetermined relationship between parameters characterizing these fields. While these parameters are commonly field strengths, they may also be frequencies in analysers where alternating fields are employed.
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| IUPAC 1997 Orange Book Chapter 12 |
| Index of Orange Book Terms |
See also
