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Japanese Journal of Applied Physics

Determination of Characteristics of Yb+ Ion Cloud Trapped in a RF Trap with He Buffer Gas

Jun Yoda, Kazuhiko Sugiyama

Published Nov 1, 1992• 2 citations
Publisher

Abstract

Characteristics of the Yb+ ion cloud trapped in a rf trap in the presence of He buffer gas were determined by fluorescence detection as well as the rf resonance method. Combining the results obtained by the two methods, we determined the spatial ion density distribution and found that the trapped ions were thermalized by collisions with the He buffer gas. It was confirmed by both methods that the harmonic motion of the trapped ions was excited by the trapping field leaked to the rf resonance detection circuit (subharmonic oscillation), and moreover, by the fluorescence detection method, that the probing rf field used for the rf resonance method was indispensable as “the initial push” for exciting the amplitude.

DOI
10.1143/jjap.31.3750

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Characteristics of the Yb+ ion cloud trapped in a rf trap in the presence of He buffer gas were determined by fluorescence detection as well as the rf resonance method. Combining the results obtained by the two methods, we determined the spatial ion density distribution and found that the trapped ions were thermalized by collisions with the He buffer gas. It was confirmed by both methods that the harmonic motion of the trapped ions was excited by the trapping field leaked to the rf resonance detection circuit (subharmonic oscillation), and moreover, by the fluorescence detection method, that the probing rf field used for the rf resonance method was indispensable as “the initial push” for exciting the amplitude.
Ba+ and Yb+ ions were trapped with buffer gas in a rf ion trap. The number and the storagetime of the trapped ions were determined by the rf resonance method. It was shown thatthe motion of the trapped ions was expressed by an external forced oscillation equation with anonlinear term in the case the fabricated trap was imperfect. Due to this nonlinear effect, thesubharmonic oscillation was induced, and thus the number and the storage time of the trappedions were decreased and shortened, respectively. The temperature and the spatial distributionof the trapped ions were determined by the fluorescence detection method.
The storage time of Yb+ ions trapped in an r.f. trap was determined by the rf resonance absorption method in the presence of buffer gas, without and with laser radiation of a frequency equal to the transition from the S1/2 ground state to the excited P1/2 state. The storage time of the ions with the buffer gas (presure between 1 × 10−4 and 4·2 × 10−4 Pa) was several hours without the laser radiation; this period was shortened to several hundred seconds by irradiation with a 500 nW laser source. This phenomenon shows that the trapped Yb+ ions disappeared from the trap as a result of irradiation with the resonance laser light.
We report isotope-selective loading and trapping of doubly ionized ytterbium into an rf quadrupole trap. Isotopically pure clouds of 174Yb^{174}\mathrm{Yb}174Yb+{}^{+}+ ions were first loaded into the rf trap via a multistage photoionization process. The Yb2+{}^{2+}2+ ions were then produced by electron impact ionization of the trapped Yb+{}^{+}+ ions. The Yb2+{}^{2+}2+ ions were subsequently detected by rf excitation of their secular motion in the trap, which led to sympathetic heating and changes in the fluorescence of the laser-cooled Yb+{}^{+}+ ions. The presence of doubly charged Yb ions was further verified by the appearance of a dark band in the center of Yb+{}^{+}+ ion cloud after electron impact ionization. We discuss the possible formation of Yb2+{}^{2+}2+H and similar compounds and the schemes for the direct optical detection of the Yb2+{}^{2+}2+ ions.
The parametric resonant behavior of ions inside a linear rf ion trap is studied both theoretically and experimentally. Theoretically, the resonant motion of ions inside an ideal ion trap is described by approximating the trapping rf field as a harmonic pseudopotential with the ions being excited by an additional quadrupolar ac voltage. The resulting damped Mathieu equation is studied and the regions of resonant instability are predicted by investigating the solutions. Experimentally, the parametric excitation of Mg+{\mathrm{Mg}}^{+}Mg+ ions is observed by subjecting the cloud of trapped ions to an additional quadrupolar ac field. The various ion motion resonances are detected through the disappearance of the laser-induced fluorescence signal. Weak damping is introduced by the presence of a low-pressure buffer gas. The experimental results are compared with the theoretical predictions.