Confined thermal multicharged ions produced by synchrotron radiation

Church, D. A.; Kravis, S.; Sellin, I. A.; O, C. S.; Levin, J. C.; Short, R.T.; Meron, Mati; Johnson, B.M.; Jones, K. W.

doi:10.1103/physreva.36.2487

Cited by 51 publications

(13 citation statements)

References 15 publications

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“…While laser techniques are useful in trapping and cooling neutral [9] and singly ionized atoms [10], the isolation and cooling of highly ionized atoms is, in general, made more challenging by the higher temperatures during production in ion sources. Highly charged ions have been successfully produced at low temperatures in ion traps via in situ photoionization [11], but this technique requires a synchrotron radiation source and produces a mixture of charge states. Different types of ion traps have been used to capture and store single charge states of multiply ionized atoms [12,13], and evaporative cooling has been demonstrated recently [14].…”

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Measurement of the Kr xviii3d2D5/2lifetime at low energy in a unitary Penning trap

et al. 2014

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A different technique is used to study the radiative decay of a metastable state in multiply ionized atoms. With use of a unitary Penning trap to selectively capture Kr 17+ ions from an ion source at NIST, the decay of the 3d 2 D 5/2 metastable state is measured in isolation at low energy, without any active cooling. The highly ionized atoms are trapped in the fine structure of the electronic ground configuration with an energy spread of 4(1) eV, which is narrower than within the ion source by a factor of about 100. By observing the visible 637 nm photon emission of the forbidden transition from the 3d 2 D 5/2 level to the ground state, we measured its radiative lifetime to be τ = 24.48 ms ± 0.28stat. ms ± 0.14syst. ms. Remarkably, various theoretical predictions for this relativistic Rydberg atom are in agreement with our measurement at the 1% level.Forbidden transitions between long-lived states in atoms, which are metastable because they cannot decay via electric dipole transitions, play pivotal roles in many fields-including frequency-standard metrology [1-3], determination of fundamental constants [4,5], tests of the standard model [4,6], and astrophysics [7,8]. Isolating such systems at low temperature is ideal for understanding their characteristics and for developing applications. While laser techniques are useful in trapping and cooling neutral [9] and singly ionized atoms [10], the isolation and cooling of highly ionized atoms is, in general, made more challenging by the higher temperatures during production in ion sources. Highly charged ions have been successfully produced at low temperatures in ion traps via in situ photoionization [11], but this technique requires a synchrotron radiation source and produces a mixture of charge states. Different types of ion traps have been used to capture and store single charge states of multiply ionized atoms [12,13], and evaporative cooling has been demonstrated recently [14]. However, the usefulness can be limited by the time required to cool the ions, which can exceed the time scale of interest-such as in radiative decay. For example, a time constant of t c ≈ 32 ms for evaporative cooling [14] would require 147 ms to reduce energy by a factor of 100.In this work, we report the observation of a forbidden transition in highly ionized Kr 17+ atoms (or Kr XVIII in spectroscopic notation) that are isolated at low energy. The ion source is the electron beam ion trap (EBIT) at NIST [15]. The low kinetic energy (≈ 5 eV) is attained within 1 ms after ion extraction, and is obtained by using a unitary Penning trap to selectively capture Kr 17+ ions extracted from the EBIT [16]. Although forbidden transitions have been studied within an EBIT, the mixture of

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confidence: 99%

Measurement of the Kr xviii3d2D5/2lifetime at low energy in a unitary Penning trap

et al. 2014

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“…Although conventional ion sources could be used in conjunction with SR for a variety of ion-photon interaction studies, access to the widest range of atomic physics experiments would best be provided by a complete Atomic Physics Typical results of Penning ion trap studies [25,26]. is mounted on wheels to be completely removable for replacement with other modules such as fluorescence [19] or recoil-time-of-flight [23,24].…”

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confidence: 99%

“…Table I shows the comparison of measured charge state fractions for production only [23,24] and for production plus trapping [25]. Note that for Ar and higher charge states the results are o i 2-1.…”

Section: Production and Storage Of Low-energy Highly-charged Ionsmentioning

confidence: 99%

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Atomic physics and synchrotron radiation: The production and accumulation of highly charged ions

Johnson

Meron

Agagu

et al. 1987

Nuclear Instruments and Methods in Physics Research Section B:

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Synchrotron radiation can be used to produce highly-charged ions, and to study photoexcitation and photoionization for ions of virtually any element In the periodic table. To date, with few exceptions, atomic physics studies have been limited to rare gases and a few metal vapors, and to photoexcitation energies in the VUV region of the electromagnetic spectrum. These limitations can now be overcome using photons produced by high-brightness synchrotron storage rings, such as the x-ray ring at the National Synchrotron Light Source

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“…Recently, synchrotron radiation sources have been used to produce inner-shell holes [3,4], which then decay to form multiply charged residual ions. The distribution of the final charge states reflects the dynamical characteristic of the system with one or more inner-shell holes.…”

Section: Introductionmentioning

confidence: 99%

Shake-off effects on the production and decay of hollow ions

Omar

Hahn

1992

Z Phys D - Atoms, Molecules and Clusters

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Atoms, MoleculesZeiischrift a n d C l u s t e r s fflr Physi k D © Springer-Verlag 1992 Shake-off effects on the production and decay Abstract. An improved form of the radiative-Auger-cascade model is presented in which the shake-off contribution is incorporated into the model in a mathematically consistent way, avoiding the problem of double counting. The higher charge state distribution found in the photoionization experiment of the 1 s electron in Ne is shown to be predominantly due to the shake-off effect during the formation of the 1 s hole, and not during the cascade decays as previously assumed. This shake-off contribution is estimated in the sudden approximation, in terms of overlaps between the neutral and singly ionized ions. An excellent agreement with experiment is obtained in the case of Ne + with 1 s hole. The details of the X-ray and Auger spectra are also predicted by the new model both for the Ne and Mg ions. The shake-off effect on the resonant processes in general is discussed.

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Confined thermal multicharged ions produced by synchrotron radiation

Cited by 51 publications

References 15 publications

Measurement of the Kr xviii3d2D5/2lifetime at low energy in a unitary Penning trap

Measurement of the Kr xviii3d2D5/2lifetime at low energy in a unitary Penning trap

Atomic physics and synchrotron radiation: The production and accumulation of highly charged ions

Shake-off effects on the production and decay of hollow ions

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