The Ramsey method in high-precision mass spectrometry with Penning traps

Experimental results

S. George, K. Blaum, F. Herfurth, A. Herlert, M. Kretzschmar, S. Nagy, S. Schwarz, L. Schweikhard, C. Yazidjian

Research output: Contribution to journalArticle

120 Citations (Scopus)

Abstract

The highest precision in direct mass measurements is obtained with Penning trap mass spectrometry. Most experiments use the interconversion of the magnetron and cyclotron motional modes of the stored ion due to excitation by external radiofrequency-quadrupole fields. In this work a new excitation scheme, Ramsey's method of time-separated oscillatory fields, has been successfully tested. It has been shown to reduce significantly the uncertainty in the determination of the cyclotron frequency and thus of the ion mass of interest. The theoretical description of the ion motion excited with Ramsey's method in a Penning trap and subsequently the calculation of the resonance line shapes for different excitation times, pulse structures, and detunings of the quadrupole field has been carried out in a quantum mechanical framework and is discussed in detail in the preceding article in this journal by M. Kretzschmar. Here, the new excitation technique has been applied with the ISOLTRAP mass spectrometer at ISOLDE/CERN for mass measurements on stable as well as short-lived nuclides. The experimental resonances are in agreement with the theoretical predictions and a precision gain more than a factor of three was achieved compared to the use of the conventional excitation technique.

Original languageEnglish
Pages (from-to)110-121
Number of pages12
JournalInternational Journal of Mass Spectrometry
Volume264
Issue number2-3
DOIs
Publication statusPublished - Jul 1 2007

Fingerprint

Mass spectrometry
mass spectroscopy
Cyclotrons
traps
Ions
excitation
Mass spectrometers
quadrupoles
Isotopes
ion motion
cyclotron frequency
nuclides
resonance lines
mass spectrometers
cyclotrons
line shape
ions
Experiments
predictions
pulses

Keywords

  • Ion motion
  • Mass spectrometry
  • Penning trap
  • Ramsey excitation

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Spectroscopy

Cite this

The Ramsey method in high-precision mass spectrometry with Penning traps : Experimental results. / George, S.; Blaum, K.; Herfurth, F.; Herlert, A.; Kretzschmar, M.; Nagy, S.; Schwarz, S.; Schweikhard, L.; Yazidjian, C.

In: International Journal of Mass Spectrometry, Vol. 264, No. 2-3, 01.07.2007, p. 110-121.

Research output: Contribution to journalArticle

George, S, Blaum, K, Herfurth, F, Herlert, A, Kretzschmar, M, Nagy, S, Schwarz, S, Schweikhard, L & Yazidjian, C 2007, 'The Ramsey method in high-precision mass spectrometry with Penning traps: Experimental results', International Journal of Mass Spectrometry, vol. 264, no. 2-3, pp. 110-121. https://doi.org/10.1016/j.ijms.2007.04.003
George, S. ; Blaum, K. ; Herfurth, F. ; Herlert, A. ; Kretzschmar, M. ; Nagy, S. ; Schwarz, S. ; Schweikhard, L. ; Yazidjian, C. / The Ramsey method in high-precision mass spectrometry with Penning traps : Experimental results. In: International Journal of Mass Spectrometry. 2007 ; Vol. 264, No. 2-3. pp. 110-121.
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