High-resolution field ionizer for state-selective detection of Rydberg atoms in fast-beam laser spectroscopy

Stratmann, K.; Hohmann, R.; Kluge, H.-J.; Kunze, S.; Lantzsch, J.; Monz, L.; Otten, E.‐W.; Passler, G.; Stenner, J.; Wendt, K.; Zimmer, K.

doi:10.1063/1.1144833

Cited by 9 publications

(11 citation statements)

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“…In the adiabatic limit where the classical electron motion is fast compared to the electric field pulse, the field necessary to reach saturation of ionization for the ensemble of Rydberg atoms (to ionize all Rydberg states above a given n within the pulse duration) is calculated 96 to be E n − IP = −5.97F 1/2 V/ cm, corresponding to a field gradient of using the parameters for an indium Rydberg atom. This is similar to the commonly used estimate for the critical field ionization strength in the case of a static electric field 57,98 of F crit ≈ 3 × 10 8 /n * 4 V/cm . The classical Kepler period 97 of for an electron in the 5s 2 70f 2 F 5/2 state is τ K =52 ps, where a 0 is the Bohr radius and m e the electron mass.…”

Section: An Improved Field-ionization Setupsupporting

confidence: 88%

“…An additional advantage of the grid field ionization arrangement is that the grids approximate a plane geometry for the electric field, removing the dependence on transverse displacement of the atom beam on the field gradient experienced by the atoms (see Fig. 3 c) compared to compared to traditional tube field-ionization geometries where large differences in electric field gradient can be found transverse to the beam axis 28 , 57 . The electrostatic simulations were performed using COMSOL Multiphysics.…”

Section: Methodsmentioning

confidence: 99%

“…In this improved design, the opposite polarity deflector plates (Fig. 3 a,b) are replaced by segmented flat electrodes 57 of the same polarity, but with a potential difference of around 500 V between them to provide the equivalent electrostatic deflection of background ions created before the field-ionization grids (Fig. 8 a,b).…”

Section: An Improved Field-ionization Setupmentioning

confidence: 99%

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Laser spectroscopy of indium Rydberg atom bunches by electric field ionization

Vernon

Ricketts

Billowes

et al. 2020

Sci Rep

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This work reports on the application of a novel electric field-ionization setup for high-resolution laser spectroscopy measurements on bunched fast atomic beams in a collinear geometry. in combination with multi-step resonant excitation to Rydberg states using pulsed lasers, the field ionization technique demonstrates increased sensitivity for isotope separation and measurement of atomic parameters over previous non-resonant laser ionization methods. The setup was tested at the Collinear Resonance Ionization Spectroscopy experiment at ISOLDE-CERN to perform highresolution measurements of transitions in the indium atom from the 5s 2 5d 2 D 5/2 and 5s 2 5d 2 D 3/2 states to 5s 2 np 2 p and 5s 2 nf 2 F Rydberg states, up to a principal quantum number of n = 72. The extracted Rydberg level energies were used to re-evaluate the ionization potential of the indium atom to be 46, 670.107(4) cm −1. The nuclear magnetic dipole and nuclear electric quadrupole hyperfine structure constants and level isotope shifts of the 5s 2 5d 2 D 5/2 and 5s 2 5d 2 D 3/2 states were determined for 113,115 In. The results are compared to calculations using relativistic coupled-cluster theory. A good agreement is found with the ionization potential and isotope shifts, while disagreement of hyperfine structure constants indicates an increased importance of electron correlations in these excited atomic states. With the aim of further increasing the detection sensitivity for measurements on exotic isotopes, a systematic study of the field-ionization arrangement implemented in the work was performed at the same time and an improved design was simulated and is presented. the improved design offers increased background suppression independent of the distance from field ionization to ion detection. The ability to separate and study small quantities of isotopes from a large ensemble without losses is the limiting factor of many experimental studies in modern nuclear physics 1-4 , as exotic isotopes of interest can often only be produced at low rates (fewer than 100s of ions per second) and their accumulation into substantial quantities is prevented by their short half-lives. Furthermore, sensitive detection or separation of small quantities of isotopes also has numerous technological applications 5-11. Fast beam collinear laser spectroscopy techniques have allowed high-precision measurements on short-lived isotopes, down to rates of fewer than 100 ions per second 3,12,13. These approaches use the Doppler compression of an accelerated atomic beam to enable high-precision laser spectroscopy measurements to be performed in a collinear geometry 14,15. This technique is now being implemented at radioactive ion beam facilities worldwide, giving a resolution of a few 10s of MHz, which is sufficient to resolve the hyperfine structure for nuclear physics studies 16-19. Motivated by a need for higher sensitivity to access exotic isotopes produced at rates lower than a few ions per second, a variation of the technique, the Collinear Resonance Ionization Spectr...

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Section: An Improved Field-ionization Setupsupporting

confidence: 88%

Section: Methodsmentioning

confidence: 99%

Section: An Improved Field-ionization Setupmentioning

confidence: 99%

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Laser spectroscopy of indium Rydberg atom bunches by electric field ionization

Vernon

Ricketts

Billowes

et al. 2020

Sci Rep

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“…The Rydberg atoms are subsequently field ionized in the longitudinal electric field of a specially designed electrode system [21]. An excess potential at this location causes an additional acceleration to the ions produced by selective excitation, which therefore can be distinguished from background ions by energy analysis.…”

Section: Experimental Set-upmentioning

confidence: 99%

Rapid Trace Analysis of ^89'90Sr in Environmental Samples by Collinear Laser Resonance Ionization Mass Spectrometry

et al. 1997

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Sr, 90 Sr / Trace determination / Environmental samples / Laser mass spectrometry SummaryA fast non-radiometric technique for ultratrace analysis of the radioisotopes 89 Sr and "°Sr in environmental samples has been developed by combining mass separation with collinear laser resonance ionization spectrometry. The efficiency and isotopic selectivity of this method allows the determination of 3X10 6 atoms of "Sr and 1 Χ 10 8 atoms of 89 Sr in the presence of 10" atoms of stable strontium, corresponding to an overall efficiency of better than 10 5 and a suppression of stable strontium of more than 10 10 . Simple and fast chemical separation procedures in combination with this technique enable the accurate determination of 89 ' 90 Sr activity in various types of environmental samples within one day, which is important in case of an emergency. The results for different environmental and technical samples, including air filters, soil, grass and milk as well as cooling water from a nuclear power station, are presented, indicating the potential and versatility of this technique.

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“…The longitudinal field-ionizer [14] is composed of two sections: the ion filter section and the field ionization section. The ion-filter section in the front half is made up of tilted electrodes such as to deflect background produced residual ions out of the beam.…”

Section: Methodsmentioning

confidence: 99%

High-efficiency ultra trace detection of⁸⁵Kr

2002

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We have developed a novel version of collinear fast beam laser spectroscopy based on particle detection. The sample to be analyzed is loaded into an ion source and a mass separated fast ion beam is produced. In it we can detect with high efficiency the various krypton isotopes, and in particular the long lived rare isotope 85j by observing the optical hyperfine structure spectrum. The technique utilizes cascade two-step excitation to pump metastable krypton atoms to a high-lying Rydberg level. The metastable atom level is effectively populated from the Kr ion beam by a near resonance charge exchange reaction with rubidium vapor. Thereupon the Rydberg atoms are field-ionized and the resulting signal ions, which have been at resonance with two laser frequencies, are detected. The following transitions are used in the two-step excitation process: 5s2 [3/2] 2 -."5p2 [5/2]3 -29d[7/2J4. . The technique has been successfully applied to all the stable krypton isotopes, and to 85j< but not yet to 81j< Afterthe Kr ions are emitted from the ion source the overall detection efficiency is to date 8%. The selectivity is at the one part in 1010 level and the sensitivity at a few hundred ions/s. Obvious further improvements are possible and are outlined. A similar excitation scheme can also be applied to the other noble gases including radon and to their rare isotopes.

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High-resolution field ionizer for state-selective detection of Rydberg atoms in fast-beam laser spectroscopy

Cited by 9 publications

References 10 publications

Laser spectroscopy of indium Rydberg atom bunches by electric field ionization

Laser spectroscopy of indium Rydberg atom bunches by electric field ionization

Rapid Trace Analysis of ^89'90Sr in Environmental Samples by Collinear Laser Resonance Ionization Mass Spectrometry

High-efficiency ultra trace detection of⁸⁵Kr

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High-resolution field ionizer for state-selective detection of Rydberg atoms in fast-beam laser spectroscopy

Cited by 9 publications

References 10 publications

Laser spectroscopy of indium Rydberg atom bunches by electric field ionization

Laser spectroscopy of indium Rydberg atom bunches by electric field ionization

Rapid Trace Analysis of 89'90Sr in Environmental Samples by Collinear Laser Resonance Ionization Mass Spectrometry

High-efficiency ultra trace detection of85Kr

Contact Info

Product

Resources

About

Rapid Trace Analysis of ^89'90Sr in Environmental Samples by Collinear Laser Resonance Ionization Mass Spectrometry

High-efficiency ultra trace detection of⁸⁵Kr