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  • Articles  (12)
  • Articles: DFG German National Licenses  (12)
  • hyperfine structure  (11)
  • Amino Acid Sequence
  • Analytical Chemistry and Spectroscopy
  • Chemistry
  • 2000-2004  (12)
  • Physics  (12)
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  • Articles  (12)
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  • 1
    Electronic Resource
    Electronic Resource
    Shower Meteoroids: Constraints From Interplanetary Dust Particles And Leonid Meteors (2000)
    Springer
    Earth, moon and planets 88 (2000), S. 35-58 
    Details
    ISSN: 1573-0794
    Keywords: Chemistry ; interplanetary dust particles (IDPs) ; Leonids ; meteor trails ; meteoroids ; meteors ; structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The cometary Leonid meteoroids represent a size range in between largest carbon-richIDPs and the smallest CI meteorites. Their dustball structure and chemistry offer anopportunity to constrain hierarchical dust accretion inferred from petrologic studies ofaggregate and cluster IDPs. The Leonid shower meteoroids of known ``comet ejection''ages provide an opportunity to study space weathering of cometary dust over periodsof up to several hundred years. The meteors and aggregate and cluster IDPs displaycontinuous thermal modification of organics and volatile element (Na, K-bearing phases), that occur as discrete minerals and amorphous solids each different response during kinetically controlled ablation. Leonid meteoroids are not excessively Na-rich. The occurrences of Leonid meteors can now be accurate predicted and combined withknowledge better models for the settling rates, collections of surviving dust becomea comet nucleus-sampling mission.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1013862627781
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  • 2
    Electronic Resource
    Electronic Resource
    The COMPLIS experiment on neutron deficient Au, Pt and Ir isotopes (2000)
    Springer
    Hyperfine interactions 127 (2000), S. 71-78 
    Details
    ISSN: 1572-9540
    Keywords: laser spectroscopy ; resonance ionization spectroscopy ; laser desorption ; hyperfine structure ; isotope shift ; nuclear moments ; nuclear charge radius variation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The COMPLIS (COllaboration for spectroscopic Measurements using a Pulsed Laser Ion Source) experiment is carried out at the ISOLDE Booster facility at CERN. The aim is to measure the hyperfine structure and the isotope shift of a series of radioactive laser desorbed atoms by multiple step laser ionization. This technique is especially suitable for refractory elements not directly available as beams from the isotope separator. By collecting a primary radioactive beam, it is possible to delay the laser desorption as long as necessary to obtain the particular daughter of interest. Laser spectroscopy measurements have been carried out on very neutron deficient gold, platinum and iridium isotopes. Magnetic moments μI, spectroscopic quadrupole moments $$\user1{Q}_{\text{s}} $$ and changes of the nuclear mean square charge radius $$\delta \left\langle {\user1{r}_{\text{c}}^{\text{2}} } \right\rangle $$ along each isotopes series have been extracted. From some results, a detailed comparison with the predictions of the models is presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1012650408171
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  • 3
    Electronic Resource
    Electronic Resource
    Hyperfine anomaly for the ground state of 9Be+ (2000)
    Springer
    Hyperfine interactions 127 (2000), S. 129-132 
    Details
    ISSN: 1572-9540
    Keywords: hyperfine structure ; Fermi contact parameter ; hyperfine anomaly ; Bohr–Weisskopf effect ; multiconfigurational Hartree–Fock method ; 9Be
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The Fermi contact parameter which represents hyperfine structure (hfs) has been accurately calculated for the ground state of the 9Be+ ion in a previous paper. In the present paper, the calculated parameter is compared with a high precision measurement to derive the hfs anomaly (the Bohr-Weisskopf effect), which is caused by nuclear magnetization distribution. The obtained hfs anomaly shows a satisfactory agreement with the result of a nuclear shell model calculation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1012618928644
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  • 4
    Electronic Resource
    Electronic Resource
    Nuclear moments of neutron deficient iridium isotopes from laser spectroscopy (2000)
    Springer
    Hyperfine interactions 127 (2000), S. 79-82 
    Details
    ISSN: 1572-9540
    Keywords: laser spectroscopy ; resonance ionization spectroscopy ; hyperfine structure ; isotope shift ; nuclear moments ; nuclear charge radius variation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Laser spectroscopy measurements have been performed on neutron deficient iridium isotopes. The hyperfine structure and isotope shift of the optical Ir I transition 5d76s2 4F9/2 → 5d76s6p 6F11/2 at 351.5 nm have been studied for the 182–189Ir, $$^{186} {\text{Ir}}^\user1{m} $$ and 191,193Ir isotopes. The nuclear magnetic and quadrupole moments were obtained from the HFS measurements and the changes of the mean square charge radii from the IS measurements. A large mean square charge radius change between 187Ir and 186Ir and between $$^{186} {\text{Ir}}^\user1{m} $$ and $$^{186} {\text{Ir}}^\user1{g} $$ has been observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1012602525009
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  • 5
    Electronic Resource
    Electronic Resource
    Laser spectroscopy of the antiprotonic helium atom–molecule $${\bar pHe}^+$$ (2000)
    Springer
    Hyperfine interactions 127 (2000), S. 135-142 
    Details
    ISSN: 1572-9540
    Keywords: antiprotonic helium ; exotic atom ; hyperfine structure ; laser resonance ; microwave resonance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The metastable antiprotonic helium atom–molecule (in short, atomcule), $${\bar pHe}^+$$ , which was discovered in 1991 as being the cause of the anomalous longevity of antiprotons with an overall lifetime of about 3 μs, now provides an exotic playground for laser spectroscopy, helped by the existence of numerous long lived states with 1–2 μs lifetimes. This three body system is characterized by a large angular momentum l ∼ 38 of $${\bar p}$$ coupled with the electron in the 1s ground orbital, and looks like an exotic hydrogen isotope with many different “nuclear states” as well as an exotic molecule with two centers (He2+ and $${\bar p}$$ ). So far, a number of laser resonance transitions have been identified. The present talk will cover the following topics: (1) high precision spectroscopy in comparison with three body theories involving the relativistic effect and QED, and (2) hyperfine structure of $${\bar pHe}^+$$ ;laser-microwave triple resonance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1012670912714
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  • 6
    Electronic Resource
    Electronic Resource
    Spectroscopy of francium in a magneto optical trap (2000)
    Springer
    Hyperfine interactions 127 (2000), S. 381-386 
    Details
    ISSN: 1572-9540
    Keywords: Bohr–Weisskopf effect ; hyperfine structure ; hyperfine anomaly ; laser spectroscopy ; nuclear distributions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The francium atom offers an excellent laboratory to study electron-nucleus interactions. As the heaviest alkali, its atomic properties can be calculated with high precision, and laser trapping methods now allow precision optical spectroscopy of many isotopes. Recent measurements of the 7P1/2 hyperfine structure, when coupled with previous measurements of the ground state hyperfine structure reveal a hyperfine anomaly. The change in anomaly between an even-N isotope and an odd-N isotope is sensitive to the radial distribution of the neutron magnetization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1012601314048
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  • 7
    Electronic Resource
    Electronic Resource
    Bohr–Weisskopf effect: influence of the distributed nuclear magnetization on hfs (2000)
    Springer
    Hyperfine interactions 129 (2000), S. 319-335 
    Details
    ISSN: 1572-9540
    Keywords: nuclear magnetic moments ; Bohr–Weisskopf effect ; hyperfine structure ; parity nonconservation in atomic interactions ; Knight shift ; QED
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Nuclear magnetic moments provide a sensitive test of nuclear wave functions, in particular those of neutrons, which are not readily obtainable from other nuclear data. These are taking added importance by recent proposals to study parity non-conservation (PNC) effects in alkali atoms in isotopic series. By taking ratios of the PNC effects in pairs of isotopes, uncertainties in the atomic wave functions are largely cancelled out at the cost of knowledge of the change in the neutron wave function. The Bohr–Weisskopf effect (B–W) in the hyperfine structure interaction of atoms measures the influence of the spatial distribution of the nuclear magnetization, and thereby provides an additional constraint on the determination of the neutron wave function. The added great importance of B–W in the determination of QED effects from the hfs in hydrogen-like ions of heavy elements, as measured recently at GSI, is noted. The B–W experiments require precision measurements of the hfs interactions and, independently, of the nuclear magnetic moments. A novel atomic beam magnetic resonance (ABMR) method, combining rf and laser excitation, has been developed for a systematic study and initially applied to stable isotopes. Difficulties in adapting the experiment to the ISOLDE radioactive ion beam, which have now been surmounted, are discussed. A first radioactive beam measurement for this study, the precision hfs of 126Cs, has been obtained recently. The result is 3629.515(∼0.001) MHz. The ability of ABMR to determine with high precision nuclear magnetic moments in free atoms is a desideratum for the extraction of QED effects from the hfs of the hydrogen-like ions. We also point out manifestations of B–W in condensed matter and atomic physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1012630404421
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  • 8
    Electronic Resource
    Electronic Resource
    Hyperfine structure and $$\user1{g} $$ factor measurements on Ba+ and Eu+ isotopes (2000)
    Springer
    Hyperfine interactions 127 (2000), S. 57-64 
    Details
    ISSN: 1572-9540
    Keywords: hyperfine structure ; $$\user1{g}$$ factor ; barium ; europium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Paul and Penning ion traps have been used to determine hyperfine structure coupling constants as well as nuclear $$\user1{g} $$ factors of Ba+ ions with great precision. Attempts are under way to measure both quantities for a long chain of Eu isotopes in order to determine differential hyperfine anomalies for a better understanding of the Bohr–Weisskopf effect.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1012646207262
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  • 9
    Electronic Resource
    Electronic Resource
    Recent progress in the theory of the complex atomic hyperfine structure (2000)
    Springer
    Hyperfine interactions 127 (2000), S. 49-56 
    Details
    ISSN: 1572-9540
    Keywords: hyperfine structure ; nuclear moments
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The revised analysis of the hyperfine structure of the complex atoms on several selected examples has been performed. The complete set of corrections up to the second order perturbation theory has been taken into account and the accuracy of the wave functions in the intermediate coupling scheme has been carefully checked. The still remaining discrepancies suggest that the commonly used approximate model of the hyperfine structure might require revision.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1012694123192
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  • 10
    Electronic Resource
    Electronic Resource
    Thallium hyperfine anomaly (2000)
    Springer
    Hyperfine interactions 127 (2000), S. 347-352 
    Details
    ISSN: 1572-9540
    Keywords: Bohr–Weisskopf effect ; hyperfine anomaly ; hyperfine structure ; thallium ; nuclear distribution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Measurements of the hyperfine structure in the highly charged hydrogen like systems 203Tl80+ and 205Tl80+ are underway at the Super EBIT at LLNL. This work considers the effects of the nuclear magnetization distribution on the hyperfine structure. The difference in energy splitting due to hyperfine structure for 203Tl and 205Tl, respectively, is found to be 0.031 04(1) eV, which corresponds to a transition wavelength difference of 3.640(1) nm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1012693012231
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  • 11
    Electronic Resource
    Electronic Resource
    Trapping radioactive atoms for basic and applied research (2000)
    Springer
    Hyperfine interactions 127 (2000), S. 387-393 
    Details
    ISSN: 1572-9540
    Keywords: magneto optical trap ; radioactive atoms ; hyperfine structure ; laser spectroscopy ; cold atomic collisions ; ultrasensitive detection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report on the trapping of radioactive atoms for a variety of nuclear, atomic, and applied physics investigations. To date we have trapped 5 different radioisotopes of rubidium and cesium (82–84Rb+135,137Cs) using a magneto-optical trap (MOT) coupled to a mass separator. By optimizing the efficiency of this system, we have been able to trap as many as 6 million radioactive atoms and detect as few as 100. This technology is being applied in three different areas: (1) the parity-violating, β-decay asymmetry measurement of polarized 82Rb; (2) the study of ultracold fermionic 84Rb atoms; and (3) the use of MOTs for the ultrasensitive detection of selected radioactive species. Although all of these projects are in a formative stage of development, we highlight the progress that we have made in: (1) the trapping of 82Rb atoms in double MOT system; (2) the hyperfine structure measurement of the 5P1/2 and 5P3/2 levels in 82Rb; (3) the simultaneous trapping of 84Rb and 87Rb in overlapping MOTs; and (4) the first trapping and isotopic ratio measurement of 135Cs and 137Cs in a MOT.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1012653330886
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  • 12
    Electronic Resource
    Electronic Resource
    Isomer separation and measurement of nuclear moments with the ISOLDE RILIS (2000)
    Springer
    Hyperfine interactions 127 (2000), S. 417-420 
    Details
    ISSN: 1572-9540
    Keywords: isomer separation ; copper ; laser ion source ; resonance ionization spectroscopy ; hyperfine structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Short-lived radioisotopes are element selectively ionized by the resonance ionization laser ion source (RILIS) of the on-line isotope separator ISOLDE (CERN). The relative production of low and high spin isomers can be significantly changed when a narrow-bandwidth laser is used to scan through the atomic hyperfine structure. This allows the assignment of gamma ray transitions to the decay of the individual isomers. Moreover, the measurement of the hyperfine splitting provides a very sensitive method for the determination of magnetic moments of exotic isotopes. The technical developments are discussed for the example of copper.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1012661532704
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