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Acta Physica Polonica A

Observation of Pr+Ions in Paul Trap

Jerzy Dembczyński, Danuta Stefańska, Gustaw Szawioła, Bogusław Furmann, Ewa Stachowska, Andrzej Jarosz, B. Arcimowicz, A. Buczek, Wojciech Koczorowski, A. Krzykowski, A. Kajoch, Magdalena Elantkowska, Jarosław Ruczkowski, W. Kowalkiewicz

Published Sep 1, 1997• 4 citations

Abstract

The first observation of Pr+ ions stored in a Paul trap is reported.Initially the ions were observed by the electronic detection method, and further the laser induced fluorescence, following resonance absorption at a certain optical transition in Pr+ ion, which is excited from the ground state, was recorded.Moreover, fluorescence signal following the excitation from a low-lying metastable state could be detected.The Paul trap system and some other parts of tle experimental setup were constructed within the frame of this work and thus are briefly described in the present contribution.PACS numbers: 32.80.Pj of the equipment of the laser-spectroscopic laboratory to our group, and for having partially involved one of the authors (D.S.) in the experiments in the Paul trap, particularly with HΣ+ ions.Many valuable hints concerning the practical aspects of the experiments in the Paul trap are also deeply appreciated.

DOI: 10.12693/aphyspola.92.517

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The first observation of Pr+ ions stored in a Paul trap is reported.Initially the ions were observed by the electronic detection method, and further the laser induced fluorescence, following resonance absorption at a certain optical transition in Pr+ ion, which is excited from the ground state, was recorded.Moreover, fluorescence signal following the excitation from a low-lying metastable state could be detected.The Paul trap system and some other parts of tle experimental setup were constructed within the frame of this work and thus are briefly described in the present contribution.PACS numbers: 32.80.Pj of the equipment of the laser-spectroscopic laboratory to our group, and for having partially involved one of the authors (D.S.) in the experiments in the Paul trap, particularly with HΣ+ ions.Many valuable hints concerning the practical aspects of the experiments in the Paul trap are also deeply appreciated.

In this paper, we present a method to measure transient fluorescent dynamics with single trapped ions in a Paul trap. We use 40 Ca + ions that exhibit a Λ-type three-level system and measure the characteristic optical pumping times between the ground S 1/2 and the meta-stable D 3/2 levels. We prepare one of these states and then pump it to the opposite via the excited P 1/2 state. By measuring the scattered photons of the ion, we retrieve transient curves of the atomic fluorescence. These curves provide fundamental information about the atomic system, such as branching fractions and excited-state lifetimes, as well as experimental parameters like the efficiency of the detection system and the saturation parameter of one of the transitions. Finally, we study the time-dependent fluorescence as a function of optical power and detuning of the lasers and find a very good agreement with simulating the dynamics via a three-level open quantum system through a set of optical Bloch equations. Being able to record time-dependent fluorescence is of particular interest as it contains information about the temperature, cooling, and heating dynamics of the ion.

Clouds of two to about fifty simultaneously stored, laser-cooled

{\mathrm{Mg}}^{+}

ions in a Paul trap were observed in two phases, which are clearly distinguishable by their excitation spectra. Transitions between these phases can be induced either by a variation of the power of the laser radiation used to cool the ions or by a change of the size of the radio-frequency voltage applied to the trap. Transitions between a "crystalline" phase and a "gaseous" phase can be repeatedly observed by variation of the appropriate parameters. The two phases and the transitions between them have also been recorded by a photon-counting image system.

We demonstrate a simple technique for molecular-ion spectroscopy. BaCl

{}^{+}

molecular ions are trapped in a linear Paul trap in the presence of a room-temperature He buffer gas and photodissociated by driving an electronic transition from the ground $X {}^{1}{\ensuremath{\Sigma}}^{+}$ state to the repulsive wall of the $A {}^{1}\ensuremath{\Pi}$ state. The photodissociation spectrum is recorded by monitoring the induced trap loss of BaCl

{}^{+}

ions as a function of excitation wavelength. Accurate molecular potentials and spectroscopic constants are determined. A comparison of the theoretical photodissociation cross sections with the measurements shows excellent agreement. This study represents an important step toward the production of ultracold ground-state molecular ions.