Simultaneous monitoring of the radial modes of the ion motion and their manipulation in Penning traps by FT-ICR mass spectrometry

Breitenfeldt, M.; Ziegler, F.; Herlert, A.; Marx, G.; Schweikhard, L.

doi:10.1016/j.ijms.2007.01.003

Cited by 9 publications

(3 citation statements)

References 47 publications

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“…Excitation at nω -or nω + , results in continuous power absorption; whereas excitation at any of the combination frequencies causes finite energy absorption and periodic interconversion of energy between the magnetron and cyclotron modes. Interconversion caused by quadrupolar and octopolar excitation has been previously described and exploited to make high precision mass measurements of short-lived isotopes [28][29][30], and to manipulate ions in the FT-ICR [31][32][33][34].…”

Section: Resonant Acceleration Of Radial Ion Motionmentioning

confidence: 99%

Excitation of Radial Ion Motion in an rf-Only Multipole Ion Guide Immersed in a Strong Magnetic Field Gradient

Beu¹,

Hendrickson

Marshall

2011

J. Am. Soc. Mass Spectrom.

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Radiofrequency (rf) multipole ion guides are widely used to transfer ions through the strong magnetic field gradient between source and analyzer regions of external source Fourier transform ion cyclotron resonance mass spectrometers. Although ion transfer as determined solely by the electric field in a multipole ion guide has been thoroughly studied, transfer influenced by immersion in a strong magnetic field gradient has not been as well characterized. Recent work has indicated that the added magnetic field can have profound effects on ion transfer, ultimately resulting in loss of ions initially contained within the multipole. Those losses result from radial ejection of ions due to transient cyclotron resonance that occurs when ions traverse a region in which the magnetic field results in an effective cyclotron frequency equal to the multipole rf drive frequency divided by the multipole order (multipole order is equal to one-half the number of poles). In this work, we describe the analytical basis for ion resonance in a rf multipole ion guide with superposed static magnetic field and compare with results of numerical trajectory simulations.

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Section: Resonant Acceleration Of Radial Ion Motionmentioning

confidence: 99%

Excitation of Radial Ion Motion in an rf-Only Multipole Ion Guide Immersed in a Strong Magnetic Field Gradient

Beu¹,

Hendrickson

Marshall

2011

J. Am. Soc. Mass Spectrom.

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“…, and Breitenfeld et al. . Surprisingly it was found that the gain in resolving power was much larger than the expected factor of 2.…”

Section: Introductionmentioning

confidence: 88%

The interconversion of the radial motional modes of an ion in a Penning trap mass spectrometer by 4n‐polar external radio frequency fields (n = 1,2,3,4)

Kretzschmar

2013

Annalen der Physik

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In Penning trap mass spectrometry ion masses are determined by measuring the free cyclotron frequency ν c = qB/(2π m) via the resonant conversion of the magnetron into the cyclotron motional mode, induced by the interaction with an external radio-frequency field. With octupolar rf-fields of frequency ν rf ≈ 2ν c the mass resolution has been improved by more than an order of magnitude as compared to conventional quadrupolar fields of frequency ν rf ≈ ν c and with the same pulse duration. This result raises the question what one might expect from using 12-polar rffields with frequency ν rf ≈ 3ν c or even 16-polar rf-fields with frequency ν rf ≈ 4ν c .In this paper the theoretical model for the interconversion of the radial modes by quadrupolar and octupolar rffields is generalized to general 4n-polar fields. As in the earlier work the complex amplitudes of the cyclotron and magnetron oscillators are used as dynamical variables and the Hamiltonian equations of motion are reformulated in terms of Bloch vector components. The resulting non-linear differential equations can be solved numerically.Results are presented on excitation functions (conversion at the exact resonance frequency) and on conversion line shapes (dependence of conversion on the detuning parameter). The most important observation is the decrease of the resonance width by a factor of 2 × 10 3 as one passes from quadrupolar (n = 1) to 12-polar (n = 3) and 16-polar (n = 4) excitation.

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“…In the following, a new approach for the improvement of the cooling process is studied. It is based on the replacement of the quadrupolar excitation by an octupolar excitation, which has recently been introduced to ion-cyclotron-resonance mass spectrometry [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

A study of octupolar excitation for mass-selective centering in Penning traps

Rosenbusch

Bohm

Borgmann

et al. 2012

International Journal of Mass Spectrometry

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Octupolar excitation has been investigated with respect to mass-selective ion centering in buffer-gas filled Penning traps for the isolation of an ion species of interest. To this end, off-line test measurements have been performed with the preparation Penning trap of the mass spectrometer ISOLTRAP located at ISOLDE/CERN including a comparison with the conventional quadrupolar excitation. The experimental results are compared to numerical simulations of ions under influence of quadrupolar and octupolar excitation. (c) 2012 Elsevier B.V. All rights reserved

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Simultaneous monitoring of the radial modes of the ion motion and their manipulation in Penning traps by FT-ICR mass spectrometry

Cited by 9 publications

References 47 publications

Excitation of Radial Ion Motion in an rf-Only Multipole Ion Guide Immersed in a Strong Magnetic Field Gradient

Excitation of Radial Ion Motion in an rf-Only Multipole Ion Guide Immersed in a Strong Magnetic Field Gradient

The interconversion of the radial motional modes of an ion in a Penning trap mass spectrometer by 4n‐polar external radio frequency fields (n = 1,2,3,4)

A study of octupolar excitation for mass-selective centering in Penning traps

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