Resonance ionization spectroscopy on a fast atomic ytterbium beam

Schulz, Christoph; Arnold, E.; Borchers, W.; Neu, W.; Neugart, R.; Neuroth, M; Otten, E.‐W.; Scherf, M.; Wendt, K.; Lievens, Peter; Kudryavtsev, Yuri; Letokhov, V. S.; Mishin, V. I.; Petrunin, V. V.

doi:10.1088/0953-4075/24/22/020

Cited by 67 publications

(46 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…High-resolution optical measurements were performed on both the 7s 2 S 1=2 → 7p 2 P 3=2 atomic transition [7][8][9] and the 7s 2 S 1=2 → 8p 2 P 3=2 transition [10], along with transitions into high-lying Rydberg states [11]. The CRIS technique, a combination of collinear laser spectroscopy and resonance ionization, was originally proposed by Kudriavtsev and Letokhov in 1982 [12], but the on-line experimental realization of the technique was not performed until 1991 on ytterbium atoms [13].…”

Section: Introductionmentioning

confidence: 99%

Decay-Assisted Laser Spectroscopy of Neutron-Deficient Francium

et al. 2014

View full text Add to dashboard Cite

This paper reports on the hyperfine-structure and radioactive-decay studies of the neutron-deficient francium isotopes [202][203][204][205][206] Fr performed with the Collinear Resonance Ionization Spectroscopy (CRIS) experiment at the ISOLDE facility, CERN. The high resolution innate to collinear laser spectroscopy is combined with the high efficiency of ion detection to provide a highly sensitive technique to probe the hyperfine structure of exotic isotopes. The technique of decay-assisted laser spectroscopy is presented, whereby the isomeric ion beam is deflected to a decay-spectroscopy station for alpha-decay tagging of the hyperfine components. Here, we present the first hyperfine-structure measurements of the neutron-deficient francium isotopes [202][203][204][205][206] Fr, in addition to the identification of the low-lying states of 202;204 Fr performed at the CRIS experiment.

show abstract

Section: Introductionmentioning

confidence: 99%

Decay-Assisted Laser Spectroscopy of Neutron-Deficient Francium

et al. 2014

View full text Add to dashboard Cite

show abstract

“…The high sensitivity is reached through a combination of the excellent overlap of laser and beam, and the high quantum efficiency of ion detectors. This new technique may be applied generally to all nuclides, but it is at the limits of nuclear stability that it will manifest its particular advantages.The CRIS method was first proposed more than 30 years ago [5], and its sub-Doppler resolution was demonstrated by Schultz et al, who measured the radioactive isotopes of ytterbium [6]. Since these isotopes were produced as a continuous beam, the duty cycle losses associated with pulsed lasers introduced a loss in efficiency by a factor of 30, which contributed to a low total experimental efficiency of 0.001%.…”

mentioning

confidence: 99%

“…The CRIS method was first proposed more than 30 years ago [5], and its sub-Doppler resolution was demonstrated by Schultz et al, who measured the radioactive isotopes of ytterbium [6]. Since these isotopes were produced as a continuous beam, the duty cycle losses associated with pulsed lasers introduced a loss in efficiency by a factor of 30, which contributed to a low total experimental efficiency of 0.001%.…”

mentioning

confidence: 99%

Collinear Resonance Ionization Spectroscopy of Neutron-Deficient Francium Isotopes

et al. 2013

View full text Add to dashboard Cite

The magnetic moments and isotope shifts of the neutron-deficient francium isotopes [202][203][204][205] Fr were measured at ISOLDE-CERN with use of collinear resonance ionization spectroscopy. A production-todetection efficiency of 1% was measured for 202 Fr. The background from nonresonant and collisional ionization was maintained below one ion in 10 5 beam particles. There are surprisingly few nuclear observables with which theorists can elucidate the nuclear force and interacting many-fermion problem. The laser spectroscopy technique reported here has measured two of these (the magnetic moment and mean-square charge radius) via the hyperfine interaction and isotope shift. This is achieved without introducing assumptions associated with any particular approach, making these measurements suitable for testing modern nuclear models. A variety of laser spectroscopy techniques now exists for studying shortlived radioactive isotopes, which broadly focus on either high resolution (< 100 MHz linewidth) or high sensitivity (< 1 atom=s) [1,2].We report here the first measurements of 202;203;205 Fr, reaching 11 neutrons from the N ¼ 126 shell closure. This has been made possible by a new highly sensitive, highresolution technique of bunched collinear-beam resonance ionization spectroscopy (CRIS). The CRIS technique combines for the first time velocity bunching (provided by the collinear geometry [3,4]) and time bunching (to eliminate the duty loss of required pulsed laser systems). The high sensitivity is reached through a combination of the excellent overlap of laser and beam, and the high quantum efficiency of ion detectors. This new technique may be applied generally to all nuclides, but it is at the limits of nuclear stability that it will manifest its particular advantages.The CRIS method was first proposed more than 30 years ago [5], and its sub-Doppler resolution was demonstrated by Schultz et al., who measured the radioactive isotopes of ytterbium [6]. Since these isotopes were produced as a continuous beam, the duty cycle losses associated with pulsed lasers introduced a loss in efficiency by a factor of 30, which contributed to a low total experimental efficiency of 0.001%. With the installation of a gas-filled radio frequency quadrupole ion trap (ISCOOL) at ISOLDE, bunched ion beams that match the duty cycle of the pulsed lasers are now available [7]. This motivated the development of a dedicated experiment to exploit the CRIS technique applied to time-bunched beams. In the present case it allowed for the first time measurements of the neutrondeficient francium isotopes with half-lives as short as 300 ms and production rates below 100 atoms=s.In our work the francium isotopes were produced through spallation reactions induced by 1.4 GeV protons, incident on a high temperature uranium carbide target (2000 C) and surface ionized (ionization potential 4.07 eV [8]) with use of a tantalum ionizer tube. A schematic of the experiment is presented in Fig. 1. The beam was accelerated to 50 keV, mass separated, and sub...

show abstract

“…By the use of artificially enriched isotopes with abundances in the 10 À9 range and below, numerous bio-medical studies (e.g. aluminum in-vivo kinetics via 26 Al, osteoporosis research via 41 Ca) and investigations in material sciences (using e.g.…”

Section: à9mentioning

confidence: 99%

“…26) This technique was also used to set up a fast and sensitive laser based determination technique for the isotopes 89;90 Sr, applied to various environmental and technical samples in the context of radioprotection following the Tchernobyl reactor accident. 27) High resolution RIS using multi-step excitation with narrow bandwidth cw laser radiation interacting in perpendicular geometry with a well collimated thermal atomic beam is another very versatile method in ultra trace analysis.…”

Section: Resonant Processes Using Narrow Bandwidth Continuous Wave Lamentioning

confidence: 99%

Trace Isotope Determination by Laser Spectroscopic Techniques

Wendt

2008

Journal of Nuclear Science and Technology

View full text Add to dashboard Cite

Trace isotope determination techniques based on resonant optical excitation of atoms, i.e. resonance ionization mass spectrometry, are well known. Especially concerning the determination of low level contaminations of long-lived radioactive isotopes in environmental or technical samples, outstanding specifications have been demonstrated. Nevertheless, there is still an -even increasing -deficiency in the routine application of these techniques. This fact is ascribed to the complexity of operation and the still only limited reliability of the tunable laser systems in use. While fixed frequency lasers have widely conquered almost all fields of basic and applied research and development, the application of tunable and particularly narrow band width lasers is almost exclusively limited to the delicate fields of fundamental research and quantum optical investigations. Thus, routine investigations in the field of isotope sciences are still the domain of all kind of conventional radiometric, mass spectrometric or alternative optical techniques, but widely excluding resonant optical interaction. This review will discuss the state of the art of these resonant laser techniques developed with special emphasis on elemental isotope selective determination techniques, elucidate reasons for the slight stagnation observed in this field and stimulate further possible developments and applications.

show abstract

Resonance ionization spectroscopy on a fast atomic ytterbium beam

Cited by 67 publications

References 27 publications

Decay-Assisted Laser Spectroscopy of Neutron-Deficient Francium

Decay-Assisted Laser Spectroscopy of Neutron-Deficient Francium

Collinear Resonance Ionization Spectroscopy of Neutron-Deficient Francium Isotopes

Trace Isotope Determination by Laser Spectroscopic Techniques

Contact Info

Product

Resources

About