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  • Cyclodextrin polymers  (1)
  • PACS. 32.30.Rj X-ray spectra – 78.70.En X-ray emission spectra and fluorescence – 29.25.Ni Ion sources: positive and negative  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Ionization of iridium ions in the Dresden EBIT studied by X-ray spectroscopy of direct excitation and radiative recombination processes (2001)
    Springer
    The European physical journal 17 (2001), S. 297-305 
    Details
    ISSN: 1434-6079
    Keywords: PACS. 32.30.Rj X-ray spectra – 78.70.En X-ray emission spectra and fluorescence – 29.25.Ni Ion sources: positive and negative
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: Irq+ ( 41≤q≤64) ions with open-shell configurations have been produced in the electron beam of the room-temperature Dresden Electron Beam Ion Trap (Dresden EBIT) at electron excitation energies from 2 keV to 13 keV. X-ray emission from direct excitation processes and radiative capture in krypton-like to aluminium-like iridium ions is measured with an energy dispersive Si(Li) detector. The detected X-ray lines are analyzed and compared with results from multiconfigurational Dirac-Fock (MCDF) atomic structure calculations. This allows to determine dominant produced ion charge states at different electron energies. The analysis shows that at the realized working gas pressure of 5×10-9mbar for higher charged ions the maximum ion charge state is not preferently determined by the chosen electron beam energy needed for ionization of certain atomic substates, but by the balance between ionization and charge state reducing processes as charge exchange and radiative recombination. This behaviour is also discussed on the basis of model calculations for the resulting ion charge state distribution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100530170004
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The use of naphthalene fluorescence probes to study the binding sites on cyclodextrin polymers formed from reaction of cyclodextrin monomers with epichlorohydrin (1994)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 18 (1994), S. 385-396 
    Details
    ISSN: 1573-1111
    Keywords: Cyclodextrin polymers ; fluorescence probes ; fluorescence quenching
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Three naphthalene-based fluorescence probes were used as guest molecules to study host/guest binding with cyclodextrin (CD) polymer hosts prepared by treating α-,β-, or γ-cyclodextrin monomers with epichlorohydrin. The fluorescence data indicate that the binding interaction is much stronger for the probes with the CD polymers than with the CD monomers. Moreover, the fluorophore binding site on the CD polymers is also more hydrophobic than that on the CD monomers. Fluorescence lifetime data from one of the bound probes (2-(N-methylanilino) naphthalene-6-sulfonic acid) suggest that more than one type of binding site may exist on the CD polymers with this probe. A comparison of fluorescence data using different molecular weight ranges of the CD polymers appear to rule out the possibility of a 1∶2 host/guest complex, where the two CD units come from the same polymer chain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00707387
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    Paper (German National Licenses)
    Fulltext
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