Search results for "Thermal ionization"
showing 10 items of 55 documents
Performance of the on-line isotope separation facility HELIOS at the Mainz reactor
1981
Abstract The helium-jet on-line isotope eparation facility HELIOS is in operation at the Mainz reactor for spectroscopic studies on mass separated neutron-rich nuclides far from the line of beta-stability. The basic features and achievements of the facility are reported. A total of 45 isotopes of the elements Rb, Sr, Y, Sn, Sb, Te, Cs, Ba, La, Ce, Pr and Nd have been separated and identified so far. Overall efficiencies up to 2% have been obtained using the integrated skimmer ion source arrangement either in a hollow cathode or in a high temperature surface ionization mode. The delay time for the HELIOS system was determined to be about 1 s.
Mass spectrometric investigations of the kinetic stability of chromium and copper complexes with humic substances by isotope-labelling experiments
1999
Isotope-labelling exchange experiments were carried out to investigate the kinetic stability of Cr(III) complexes with humic substances (HS). To compare the results with those of an ion, not expected to form kinetically stable HS complexes with respect to its electron configuration, Cu(II) was investigated under the same conditions. HS solutions of different origin were therefore spiked with 53Cr(III) or 65Cu(II) after saturation of HS with chromium and copper of natural isotopic composition. In fractions of metal/HS complexes with different molecular weight, obtained by ultrafiltration and HPLC/ICP-MS using size exclusion chromatography (SEC), respectively, the isotope ratios of chromium a…
On-line implementation and first operation of the Laser Ion Source and Trap at ISOLDE/CERN
2015
13 pags.; 12 figs.; 2 tab.; Open Access funded by CERN
Resonance Ionization Mass Spectroscopy for Trace Analysis
1990
My first lecture at this Summer School on Applied Laser Spectroscopy dealt with the determination of nuclear ground-state properties, i.e. atomic mass M, the nuclear spin I, the magnetic dipole moment μ I, the spectroscopic quadrupole moment Q, and the changes in the mean-square charge radius δ(r2) A,A´ between isotopes with mass number A and A´. These quantities can be determined for stable, long-, or short-lived isotopes by mass spectrometry and optical spectroscopy. In the latter case, the hyperfine structure (HFS) and the volume effect of the isotope shift (IS) are determined in atomic levels or optical transitions. The state of the art mainly concerning short-lived nuclei is described …
On the sensitivity of ion traps for spectroscopic applications
1979
Ba+ ions, created by surface ionization near one endcap of an rf quadrupole trap were slowed down by collisions with the background gas. At He pressures of 10−6 mbar or more 2% of the primary ions could be trapped. The sensitivity of ion detection by fluorescence radiation allows spectroscopic experiments, starting from less than 107 particles. The observation of the ground-state hyperfine splitting of137Ba+ is given as an example.
Ionization potential of aluminum clusters
1998
Structure, electronic structure, and ionization potential of aluminum clusters of 2–23 atoms are studied with a total energy method based on the density-functional theory. The calculated adiabatic ionization potentials agree remarkably well with the data from threshold photoionization measurements. The analysis of results gives insight into hybridization effects in the smallest clusters as well as reveals certain clusters that exhibit a clear jellium-type shell structure. An explanation of the experimental results in the size region of 12–23 atoms is given in terms of coexisting, competing icosahedral, decahedral, and fcc-based clusters. @S0163-1829~98!00228-8#
Trace detection of radiotoxic isotopes by resonance ionization mass spectrometry
1995
Resonance ionization spectroscopy combined with mass spectrometry (RIMS) has become an important technique for ultratrace environmental analysis, and is particularly well suited for the detection of long-lived radio-toxic isotopes. A variety of experimental approaches have been developed to address the specific requirements posed by individual isotopes, which have widely differing physical, chemical, and environmental properties. In this paper we discuss the principles and recent progress in the development of three different methods that are being used for the analysis of radiotoxic species. These include measurement of actinides using triple-resonance ionization and time-of-flight mass sp…
Study of short-lived tin isotopes with a laser ion source
1995
A chemically selective laser ion source based on resonance ionization of atoms in a hot cavity has been applied for the study of short-lived silver isotopes at CERN/ ISOLDE. Silver atoms were ionized by two resonant excitations and final laser ionization into the continuum. Decay properties of the neutron-rich isotopes121–127Ag were studied with a neutron long-counter and aβ-detector.
First successful ionization of Lr (Z = 103) by a surface-ionization technique.
2013
We have developed a surface ionization ion-source as part of the JAEA-ISOL (Isotope Separator On-Line) setup, which is coupled to a He/CdI2 gas-jet transport system to determine the first ionization potential of the heaviest actinide lawrencium (Lr, Z = 103). The new ion-source is an improved version of the previous source that provided good ionization efficiencies for lanthanides. An additional filament was newly installed to give better control over its operation. We report, here, on the development of the new gas-jet coupled surface ion-source and on the first successful ionization and mass separation of 27-s (256)Lr produced in the (249)Cf + (11)B reaction.
Production of negative osmium ions by laser desorption and ionization.
2010
The interest to produce negative osmium ions is manifold in the realm of high-accuracy ion trap experiments: high-resolution nearly Doppler-free laser spectroscopy, antihydrogen formation in its ground state, and contributions to neutrino mass spectrometry. Production of these ions is generally accomplished by sputtering an Os sample with Cs(+) ions at tens of keV. Though this is a well-established method commonly used at accelerators, these kind of sources are quite demanding and tricky to operate. Therefore, the development of a more straightforward and cost effective production scheme will be of benefit for ion trap and other experiments. Such a scheme makes use of desorption and ionizat…