We report isotope-selective loading and trapping of doubly ionized ytterbium into an rf quadrupole trap. Isotopically pure clouds of $^{174}\mathrm{Yb}$ ${}^{+}$ ions were first loaded into the rf trap via a multistage photoionization process. The Yb ${}^{2+}$ ions were then produced by electron impact ionization of the trapped Yb ${}^{+}$ ions. The Yb ${}^{2+}$ 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 Yb ${}^{2+}$ H and similar compounds and the schemes for the direct optical detection of the Yb ${}^{2+}$ ions.We report isotope-selective loading and trapping of doubly ionized ytterbium into an rf quadrupole trap. Isotopically pure clouds of $^{174}\mathrm{Yb}$${}^{+}$ ions were first loaded into the rf trap via a multistage photoionization process. The Yb${}^{2+}$ ions were then produced by electron impact ionization of the trapped Yb${}^{+}$ ions. The Yb${}^{2+}$ 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 Yb${}^{2+}$H and similar compounds and the schemes for the direct optical detection of the Yb${}^{2+}$ ions.

Physical Review ADec 27, 201010 citations

Trapping of Yb+ Loaded through Photoionization in RF Ion Trap

Yugo Onoda

Jan 23, 20120 citations

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

Jun Yoda, Kazuhiko Sugiyama

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.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.

Japanese Journal of Applied PhysicsNov 1, 19922 citations

We report isotope-selective loading and trapping of doubly ionized ytterbium into an rf quadrupole trap. Isotopically pure clouds of

^{174}\mathrm{Yb}

{}^{+}

ions were first loaded into the rf trap via a multistage photoionization process. The Yb

{}^{2+}

ions were then produced by electron impact ionization of the trapped Yb

{}^{+}

ions. The Yb

{}^{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 Yb

{}^{2+}

H and similar compounds and the schemes for the direct optical detection of the Yb

{}^{2+}

ions.