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Titolo:
A new ion ejection method employing an asymmetric trapping field to improve the mass scanning performance of an electrodynamic ion trap
Autore:
Splendore, M; Marquette, E; Oppenheimer, J; Huston, C; Wells, G;
Indirizzi:
Varian Chromatog Syst, Walnut Creek, CA 94598 USA Varian Chromatog Syst Walnut Creek CA USA 94598 alnut Creek, CA 94598 USA
Titolo Testata:
INTERNATIONAL JOURNAL OF MASS SPECTROMETRY
, volume: 191, anno: 1999,
pagine: 129 - 143
SICI:
1387-3806(19990823)191:<129:ANIEME>2.0.ZU;2-1
Fonte:
ISI
Lingua:
ENG
Soggetto:
MULTIPOLE FIELDS; EXCITATION;
Keywords:
quadrupole ion trap; asymmetric trapping field; multipole trapping field; nonlinear resonance; mass scanning;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
30
Recensione:
Indirizzi per estratti:
Indirizzo: Splendore, M Varian Chromatog Syst, Walnut Creek, CA 94598 USA Varian Chromatog Syst Walnut Creek CA USA 94598 CA 94598 USA
Citazione:
M. Splendore et al., "A new ion ejection method employing an asymmetric trapping field to improve the mass scanning performance of an electrodynamic ion trap", INT J MASS, 191, 1999, pp. 129-143

Abstract

A new method to eject ions from an electrodynamic ion trap is discussed. An asymmetric trapping field is electronically generated with electrodes, comprised of a ring electrode and two end-cap electrodes having symmetrical hyperbolic surfaces. The asymmetric trapping field is generated by adding analternating voltage out of phase to each end cap at the same frequency as the ring electrode. The resulting multipole field has a dipole component inthe axial direction, as well as a significant hexapole component. All ionsconfined in the combined trapping field are uniformly displaced away from the geometrical center of the ion trap, defined to be the midpoint along the axis of symmetry between the end-cap electrodes. The displacement is independent of the mass-to-charge ratio of the ions. During mass analysis ions are ejected predominantly through one end-cap electrode and the detected ion signal intensity is doubled, Mass analysis is performed by the application of phase-locked supplementary dipole and quadrupole excitation fields at an operating point corresponding to beta(z) = 2/3. Ions at this operating point are simultaneously in resonance with three fields: (1) the nonlinear hexapole trapping field resonance, (2) the parametric resonance with the supplementary quadrupole field, and (3) the sideband resonance with the supplementary dipole field. The simultaneous triple resonance causes extremely fast power absorption by the ions and improved mass resolution, (Int J Mass Spectrom 190/191 (1999) 129-143) (C) 1999 Elsevier Science B.V.

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Documento generato il 10/07/20 alle ore 09:47:08