2E mass spectrum: Difference between revisions
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that occur in a collision cell (containing a gas, N) 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 electric sector field E is set to twice the value required to transmit the main ion-beam, the only ions to be transmitted will be those with a kinetic energy-to-charge ratio twice, or almost exactly twice, that of the main ion-beam. The product | that occur in a [[collision cell]] (containing a gas, N) 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 [[electric sector]] field E is set to twice the value required to transmit the main ion-beam, the only ions to be transmitted will be those with a [[kinetic energy]]-to-charge ratio twice, or almost exactly twice, that of the main ion-beam. The [[product ion]]s of the process shown fulfil this condition. If the magnetic field B is scanned, a [[mass spectrum]] of such singly charged [[product ion]]s, and thus of their doubly charged precursors, is obtained. | ||
Such a spectrum is called a 2E mass spectrum. | Such a spectrum is called a 2E mass spectrum. | ||
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== [[Orange Book]] Entry == | == [[Orange Book]] Entry == | ||
Processes of the [[ | Processes of the [[partial charge-transfer]] type: M<sup>2+</sup> + X → M<sup>+</sup> + X<sup>+</sup> occurring in [[collision cell]] (containing 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 [[electric sector]] field is set to twice the value required to transmit the main ion beam, the only ions transmitted will be those with [[kinetic energy]]/charge ratio twice, or almost twice, that of the main ion beam. The [[product ion]]s of the above [[charge stripping]] process fulfil that condition. If the [[magnetic field]], B, is scanned, a [[mass spectrum]] of such singly-charged [[Product Ion|product ion]]s and thus of their doubly-charged precursors is obtained. Such a spectrum is termed a 2E mass spectrum. | ||
