Optical Detection of Ions Confined in a rf Quadrupole Trap

Iffländer, Reinhard; Werth, G.

doi:10.1088/0026-1394/13/3/017

Cited by 84 publications

(28 citation statements)

References 9 publications

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“…This method is being used successfully in precision mass spectrometry using Penning traps [15,16]. Nondestructive detection can be realized either by laserinduced fluorescence when the particle has a suitable [17] energy level scheme, or by the image currents induced in the trap electrodes by the ion's oscillation [18][19][20][21]. Since this method is applied in all experiments discussed below, we will exclusively consider it here.…”

Section: Trapped Particle Detectionmentioning

confidence: 99%

Electron g‐factor determinations in Penning traps

2013

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The magnetic moment of the electron, expressed by the g-factor in units of the Bohr magneton, is a key quantity in the theory of quantum electrodynamics (QED). Experiments using single particles confined in Penning traps have provided very precise values of the g-factor for the free electron as well as the electron bound in hydrogen-like ions. In this paper the status of these experiments is reviewed. The results allow testing calculations of higher order Feynman diagrams. Comparison of experimental and theoretical results for free and bound particles show no discrepancy within the limits of error, thus representing to date the most sensitive test of QED. Moreover, the g-factor provides a unique access to fundamental constants, as e.g. the electron mass or the fine structure constant.

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Section: Trapped Particle Detectionmentioning

confidence: 99%

Electron g‐factor determinations in Penning traps

2013

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“…trap [1][2][3][4][5][6][7] . Laser spectroscopy of stored ions has been shown to be highly sensitive [5], since the ions can be stored for a long time allowing for many photon scattering processes for each trapped ion . The method was found [1] to be well suited for the study of radioactive atomic ions ; in the case of Th, samples of only 10 pg, i .e .…”

Section: Introductionmentioning

confidence: 99%

“…For these measurements, the ions were confined for many hours in an r .f . trap [1][2][3][4][5][6][7] . Laser spectroscopy of stored ions has been shown to be highly sensitive [5], since the ions can be stored for a long time allowing for many photon scattering processes for each trapped ion .…”

mentioning

confidence: 99%

Two-step Optical Excitation for Doppler Linewidth Reduction and Motion Study of Ions Stored in a Paul Trap

Kälber

Meisel

Rink

et al. 1992

Journal of Modern Optics

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Atomic thorium ions were stored in an r .f. quadrupole trap and excited by tunable laser light . One-step and two-step excitation schemes were applied; a four to eightfold reduction of the Doppler linewidth is obtained for the two-step scheme with essentially no loss in signal strength . The Doppler-free two-photon transition was also observed . The lineshapes were calculated using a simple model ; the observed profiles were well reproduced proving that the velocity and acceleration features of stored ions are properly accounted for . A further reduction of the Doppler linewidth is expected for the two-step method if a short lived intermediate level is used . . IntroductionIn previous experiments [1, 2], laser spectroscopic investigations were performed on thorium ions for the determination of isotope shifts and hyperfine splittings of several thorium isotopes . For these measurements, the ions were confined for many hours in an r .f . trap [1][2][3][4][5][6][7] . Laser spectroscopy of stored ions has been shown to be highly sensitive [5], since the ions can be stored for a long time allowing for many photon scattering processes for each trapped ion . The method was found [1] to be well suited for the study of radioactive atomic ions ; in the case of Th, samples of only 10 pg, i .e . 3 x 10 10 atoms, were required for the measurements .The resolution, however, is rather low because of the relatively large Doppler broadening due to the fast motion of the ions in the confining electric field . The low resolution had the disadvantage that, for example, the hyperfine splitting of odd Th isotopes [1] could not be resolved . In order to improve the resolution, we have investigated two-step excitation as a means of reducing the Doppler broadening of spectral lines of stored ions . The methods developed proved to be useful for the study of details of the motion of stored ions allowing a deeper insight into their kinematics . . Experimental detailsThe technique of storing ions in a Paul trap is well known ; reviews are found, e .g ., in references [6,7] . For our experiments we have used an ion trap with a radius parameter r0 = 1 cm . The electrodes of the trap were made of stainless steel . It is mounted inside an ultra high vacuum chamber that is evacuated to a residual gas

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“…With the trap parameters used in the experiment, the pseudo-potential is close to being spherically symmetric; in addition, the cloud density is sufficiently low for the mutual interaction of the ions to be negligible. In this regime, it is well known that an ion cloud at thermal equilibrium has a Gaussian density profile [10,11]:…”

Section: Discussionmentioning

confidence: 99%

“…4. Curve (f) was not included in the fit, because it is clear that some process that is not accounted shown experimentally to be a constant fraction (about 1/10) of the potential depth [10,12]. …”

Section: Discussionmentioning

confidence: 99%

Photodissociation of trapped $\mathrm{H}_{2}^{+}$ ions for REMPD spectroscopy

2011

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We study the photodissociation of trapped H + 2 ions by 248 nm light from an excimer laser. Our results are in good agreement with calculated populations and photodissociation cross sections of the involved vibrational levels and yield a determination of the ion cloud radius. These data are used to obtain a reliable estimate of the efficiency of the resonance-enhanced multiphoton dissociation (REMPD) scheme in our H + 2 vibrational spectroscopy experiment. We go on to estimate the expected signal-to-noise ratio and discuss future improvements of the experimental setup.

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Optical Detection of Ions Confined in a rf Quadrupole Trap

Cited by 84 publications

References 9 publications

Electron g‐factor determinations in Penning traps

Electron g‐factor determinations in Penning traps

Two-step Optical Excitation for Doppler Linewidth Reduction and Motion Study of Ions Stored in a Paul Trap

Photodissociation of trapped $\mathrm{H}_{2}^{+}$ ions for REMPD spectroscopy

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