Linked scan: Difference between revisions
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A scan | A scan in an instrument with two or more ''[[m/z]]'' analysers or in a [[sector mass spectrometer]] that incorporates at least one [[magnetic sector]] and one [[electric sector]]. Two or more of the analyzers are scanned simultaneously so as to preserve a predetermined relationship between scan parameters to produce a [[product ion]], [[precursor ion]] or [[constant neutral loss spectrum]].}} | ||
== [[Orange Book]] Entry == | == [[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. | ||
:[[Linked Scan at Constant B/E]] | |||
This can be performed with a sector instrument incorporating at least one magnetic sector and one electric sector. The magnetic sector field strength, B, and the electric sector field strength, E, are scanned simultaneously, while holding the accelerating voltage, V, constant, so as to maintain the ratio B/E constant. This constant value is determined by the ratio of the two field strengths required to transmit main-beam ions of predetermined mass/charge ratio. These preselected main-beam ions are the precursor ions whose fragment ion spectrum is required. The term B/E linked scan is not recommended. | ::This can be performed with a sector instrument incorporating at least one magnetic sector and one electric sector. The magnetic sector field strength, B, and the electric sector field strength, E, are scanned simultaneously, while holding the accelerating voltage, V, constant, so as to maintain the ratio B/E constant. This constant value is determined by the ratio of the two field strengths required to transmit main-beam ions of predetermined mass/charge ratio. These preselected main-beam ions are the precursor ions whose fragment ion spectrum is required. The term B/E linked scan is not recommended. | ||
:[[Linked scan At Constant B(1-(E/E0))1/2/E|Linked Scan at Constant B [1- (E /E<sub>0</sub>)]1/2 /E]] | |||
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:[[Linked Scan at Constant B2/E|Linked scan at constant B<sub>2</sub>/E]] | |||
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:[[Linked Scan at Constant E2/V|Linked Scan at Constant E<sub>2</sub>/V ]] | |||
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