E/2 mass spectrum: Difference between revisions
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A mass spectrum obtained using a [[sector mass spectrometer]] in which the [[electric sector]] field E is set to half the value required to transmit the main ion-beam. This spectrum records the signal from doubly charged [[product ion]]s of [[charge-stripping]] reactions. | |||
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Revision as of 02:17, 31 December 2005
| DRAFT DEFINITION |
| E/2 mass spectrum |
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A mass spectrum obtained using a sector mass spectrometer in which the electric sector field E is set to half the value required to transmit the main ion-beam. This spectrum records the signal from doubly charged product ions of charge-stripping reactions. |
| Considered between 2004 and 2006 but not included in the 2006 PAC submission |
| This is an unofficial draft definition presented for information and comment. |
Orange Book Entry
M2+ + X → M+ + X+
Processes of the charge-stripping type: M+ + X → M2+ + X + e 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 half the value required to transmit the main ion beam, the only ions transmitted will be those with kinetic energy/charge ratio half, or almost half, that of the main ion beam. The product ions of the above charge stripping process fulfil that condition. If the magnetic field, B, is scanned, a mass spectrum of such doubly-charged product ions and thus of their singly-charged precursors is obtained. Such a spectrum is termed a E/2 mass spectrum.
