2E mass spectrum: Difference between revisions
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A mass spectrum obtained by setting the [[electric sector]] field E to twice the value required to transmit the main ion-beam thereby allowing ions with a [[kinetic energy]]-to-charge ratio twice that of the main ion-beam to be transmitted. [[Product ion]]s resulting from partial [[charge transfer]] reactions such as | A mass spectrum obtained by setting the [[electric sector]] field E to twice the value required to transmit the main ion-beam thereby allowing ions with a [[kinetic energy]]-to-charge ratio twice that of the main ion-beam to be transmitted. [[Product ion]]s resulting from partial [[charge transfer]] reactions such as | ||
::m<sup>2+</sup> + N | ::m<sup>2+</sup> + N --> m<sup>+</sup> + N<sup>+</sup> | ||
that occur in a [[collision cell]] (containing a gas, N) located in a [[field-free region]] preceding a magnetic and electric sector combination are detected. When the [[magnetic sector]] field B is scanned, a [[mass spectrum]] of singly charged [[product ion]]s of doubly charged [[precursor ion]]s is obtained. | that occur in a [[collision cell]] (containing a gas, N) located in a [[field-free region]] preceding a magnetic and electric sector combination are detected. When the [[magnetic sector]] field B is scanned, a [[mass spectrum]] of singly charged [[product ion]]s of doubly charged [[precursor ion]]s is obtained. | ||
Revision as of 21:31, 9 July 2009
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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) |
| 2E mass spectrum |
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Processes of the partial charge-transfer type: M2+ + X → M+ + X+ 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 ions of the above charge stripping process fulfil that condition. If the magnetic field, B, is scanned, a mass spectrum of such singly-charged product ions and thus of their doubly-charged precursors is obtained. Such a spectrum is termed a 2E mass spectrum. |
| IUPAC 1997 Orange Book Chapter 12 |
| Index of Orange Book Terms |
