Production of Ce negative ions in a Cs sputter ion source

Saitoh, Yoichi; Yotsombat, B.; Mizuhashi, K.; Tajima, S.

doi:10.1063/1.1150356

Cited by 10 publications

(6 citation statements)

References 5 publications

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“…Negative ions were produced by a cesium sputtering source using a cathode packed with CeO 2 powder and then covered with tungsten in a double-layer design [19]. The ions were accelerated to 12 keV, and the 140 Ce − isotope was then mass selected using a 90 o focusing sector magnet to steer the beam into a UHV chamber.…”

Section: Experimental Methods and Measured Spectrummentioning

confidence: 99%

Experimental and theoretical study of bound and quasibound states ofCe−

Walter

Gibson

et al. 2011

Phys. Rev. A

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The negative ion of cerium is investigated experimentally with tunable infrared laser photodetachment spectroscopy and theoretically with relativistic configuration interaction in the continuum formalism. The relative cross section for neutral atom production is measured with a crossed ionbeam-laser-beam apparatus over the photon energy range 0.54 -0.75 eV. A rich resonance spectrum is revealed near threshold, with at least twelve peaks observed due to transitions from bound states of Ce − to either bound or quasi-bound excited states of the negative ion. Theoretical calculations of the photodetachment cross sections enable identification of the transitions responsible for the measured peaks. Two of the peaks are due to electric-dipole-allowed bound-bound transitions in Ce − , making cerium only the second atomic negative ion that has been demonstrated to support multiple bound states of opposite parity. In addition, combining the experimental data with the theoretical analysis determines the electron affinity of cerium to be 0.628(10) eV and the fine structure splitting of the ground state of Ce − ( 4 H 7/2 -4 H 9/2 ) to be 0.09775(4) eV.

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Section: Experimental Methods and Measured Spectrummentioning

confidence: 99%

Experimental and theoretical study of bound and quasibound states ofCe−

Walter

Gibson

et al. 2011

Phys. Rev. A

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“…Negative ions produced by a cesium sputter source [23] using a cathode packed with powdered lanthanum oxide covered by a tungsten layer [24] were accelerated to 12 keV and magnetically mass selected producing ∼30 pA of 139 La − . The ion beam was intersected perpendicularly by a pulsed laser beam, following which residual negative ions were electrostatically deflected into a Faraday cup, while neutral atoms produced by photodetachment continued undeflected to a detector.…”

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confidence: 99%

Candidate for Laser Cooling of a Negative Ion: Observations of Bound-Bound Transitions inLa−

et al. 2014

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Despite the tremendous advances in laser cooling of neutral atoms and positive ions, no negatively charged ion has been directly laser cooled. The negative ion of lanthanum, La(-), has been proposed as the best candidate for laser cooling of any atomic anion [ and , Phys. Rev. A 81, 032503 (2010)]. Tunable infrared laser photodetachment spectroscopy is used to measure the bound-state structure of La(-), revealing a spectrum of unprecedented richness with multiple bound-bound electric dipole transitions. The potential laser-cooling transition ((3)F(2)(e)→(3)D(1)(o)) is identified and its excitation energy is measured. The results confirm that La^{-} is a very promising negative ion for laser-cooling applications.

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“…In the present experiments, photodetachment from Lawas measured as a function of photon energy using a crossed ion-beam-laser-beam system that has been described in detail previously [14,15]. Negative ions were produced by a cesium sputter ion source (NEC SNICS II) [16] using a cathode packed with powdered lanthanum oxide covered by a tungsten layer [17].…”

Section: Experimental Methodsmentioning

confidence: 99%

Photodetachment spectroscopy of quasibound states of the negative ion of lanthanum

et al. 2020

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The negative ion of lanthanum, La -, has one of the richest bound state spectra observed for an atomic negative ion and has been proposed as a promising candidate for laser-cooling applications.In the present experiments, Lawas investigated using tunable infrared photodetachment spectroscopy. The relative signal for neutral atom production was measured with a crossed ionbeam--laser-beam apparatus over the photon energy range 590 -920 meV (2100 -1350 nm) to probe the continuum region above the La neutral atom ground state. Eleven prominent peaks were observed in the Laphotodetachment cross section due to resonant excitation of quasibound transient negative ion states in the continuum which subsequently autodetach. In addition, thresholds were observed for photodetachment from several bound states of Lato both ground and excited states of La. The present results provide information on the excited state structure and dynamics of Lathat depend crucially on multielectron correlation effects.

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Production of Ce negative ions in a Cs sputter ion source

Cited by 10 publications

References 5 publications

Experimental and theoretical study of bound and quasibound states ofCe−

Experimental and theoretical study of bound and quasibound states ofCe−

Candidate for Laser Cooling of a Negative Ion: Observations of Bound-Bound Transitions inLa−

Photodetachment spectroscopy of quasibound states of the negative ion of lanthanum

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