Bibliothek

X
feed icon rss

Ihre E-Mail wurde erfolgreich gesendet. Bitte prüfen Sie Ihren Maileingang.

Leider ist ein Fehler beim E-Mail-Versand aufgetreten. Bitte versuchen Sie es erneut.

Vorgang fortführen?

Exportieren
Filter
  • Digitale Medien  (6)
  • 2000-2004  (6)
  • 1
    Digitale Medien
    Digitale Medien
    Femtosecond pump–probe ionization of small NaI–Sn clusters, S:H2O,NH3: A tool to probe the structure of the cluster (2000)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 112 (2000), S. 8794-8805 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: Femtosecond pump–probe ionization experiments on small NaI–Sn=1–7 clusters, S:NH3,H2O, are reported. The excitation of the clusters by the pump laser induces the NaI bond breaking within the cluster as well as evaporation of solvent molecules both in the excited and ionic states. Depending on the detection scheme used, namely one-photon or resonant two-photon ionization, the resulting Na+–Sn time-dependent signals are not similar. This reflects the major role of the ionization process in the nature of the dynamics probed. Furthermore, a solvent-selective behavior evidenced on the Na+–Sn signals has been related to different cluster structures according to the solvent nature: NaI seems to be embedded within ammonia clusters while it sticks on the surface of water clusters, when they are larger than four molecules. © 2000 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.481495
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 2
    Digitale Medien
    Digitale Medien
    Aberrations due to solenoid focusing of a multiply charged high-current ion beam : The 8th international conference on ion sources (2000)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 71 (2000), S. 1097-1099 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: At the output of a laser ion source, a high current of highly charged ions with a large range of charge states is available. The focusing of such a beam by magnetic elements causes a nonlinear space-charge field to develop which can induce large aberrations and emittance growth in the beam. Simulation of the beam from the CERN laser ion source will be presented for an ideal magnetic and electrostatic system using a radially symmetric model. In addition, the three dimensional software KOBRA3 is used for the simulation of the solenoid line. The results of these simulations will be compared with experiments performed on the CERN laser ion source with solenoids (resulting in a hollow beam) and a series of gridded electrostatic lenses. © 2000 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1150395
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 3
    Digitale Medien
    Digitale Medien
    Status of the CO2 laser ion source at CERN : The 8th international conference on ion sources (2000)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 71 (2000), S. 924-926 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: A laser ion source using a CO2 laser focused onto a solid target is under study at CERN for the production of high currents of highly charged heavy ions, for possible use in the preinjector for the large hadron collider. A new expansion and extraction layout was installed in this test facility, improving the alignment and making the target to extraction distance more flexible. A two solenoid beam transport system was studied for providing the matching of the beam to a radio-frequency quadrupole. An electrostatic beam transport using gridded electrostatic lenses was designed and constructed as an alternative to a magnetic system. Results show an increased overall current transmission for the electrostatic case. Investigation of the laser parameters required for the production of 1.4×1010 Pb25+ ions in a 5 μs pulse, has been performed using the TIR-1 laser facility at power densities up to 1014 W cm−2 for a focal spot size of 65 μm. The results of the latest scaling are presented. © 2000 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1150347
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 4
    Digitale Medien
    Digitale Medien
    Infrared spectroscopy to probe structure and growth dynamics in Fe+-(CO2)n clusters (2002)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 117 (2002), S. 2120-2130 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: Fe+-(CO2)n ion-molecule complexes are produced by laser vaporization in a pulsed-nozzle cluster source. These species are analyzed and mass-selected using a specially designed reflectron time-of-flight mass spectrometer. Infrared photodissociation of these complexes is investigated with an optical parametric oscillator/amplifier system using wavelengths near the CO2 asymmetric stretch vibration (2349 cm−1). Dissociation occurs by successive elimination of CO2 molecules. Tunable laser experiments obtain infrared resonance-enhanced photodissociation spectra for these complexes. Small complexes have CO2 asymmetric stretch resonances shifted to higher frequency than the free CO2 mode. The blueshift decreases initially with cluster size, but becomes nearly constant after the n=4 cluster. Argon-tagged complexes, e.g., Fe+-(CO2)n⋅Arm, photodissociate via the same CO2 resonances by elimination of argon. Except for the n=1 complex, bands for the tagged complexes occur at the same frequency as those for the corresponding CO2 complex without argon. Larger complexes exhibit additional resonances near the free CO2 asymmetric stretch indicating "surface" molecules not attached to the metal. Blueshifted resonances also persist in these complexes attributed to "core" ligands attached to the metal ion. In the largest clusters studied (n=9–14), additional resonances with an intermediate blueshift are measured associated with "caged" CO2 molecules not attached to the metal. These measurements demonstrate that infrared photodissociation spectroscopy has exciting potential to study clustering structures and dynamics around metal ions. © 2002 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1490600
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 5
    Digitale Medien
    Digitale Medien
    Synthesis by a soft chemistry route and characterization of LixNi1 − xO (0 〈 x 〈 0.5) compounds: Behavior in molten carbonates (2000)
    Springer
    Journal of materials science 35 (2000), S. 2683-2688 
    Details
    ISSN: 1573-4803
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract LixNi1 − xO powders and LixNi1 − xO/Au with 0 〈 x 〈 0.5 are synthesized by a soft chemistry route. Analysis of LixNi1 − xO by XRD shows an evolution from NiO (0 〈 x 〈 0.3) to LiNiO2 (0.3 〈 x 〈 0.5) structures. The stability of LixNi1 − xO/Au (0 〈 x 0.5) compounds synthesized by soft chemistry is studied in molten (Li0.52Na0.48)2CO3 eutectic at 650°C, under the cathode atmosphere used in molten carbonate fuel cells (air/CO2: 70/30). After a 48 h immersion, analysis by XRD of the lithiated nickel oxide shows that lithium ions diffuse from the oxide to the bulk of the melt. The major oxide detected at the surface of the sample has a composition very close to that of NiO formed in situ at the surface of a nickel foil. Hence, highly lithiated nickel oxides are not stable in the melt. LixNi1 − xO is rapidly transformed confirming the very high stability of Ni(II) in the working conditions.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1004793607621
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 6
    Digitale Medien
    Digitale Medien
    Observation of the first vibrations of the newly born Cs-CH CN complex (2000)
    Springer
    The European physical journal 11 (2000), S. 227-231 
    Details
    ISSN: 1434-6079
    Schlagwort(e): PACS. 34.20.-b Interatomic and intermolecular potentials and forces, potential energy surfaces for collisions - 82.30.Eh Molecule-molecule reactions
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract: The femtosecond photodissociation of CsI in the CsI-CH3CN complex has been studied. Recurrences are observed in the detection of the Cs+-CH3CN ion complex. They are assigned to the first vibrations of the Cs-NCCH3 bond formed after the CsI dissociation. This result is in good agreement with calculations on the similar NaI-CH3CN system which predict a linear structure for the ground state complex.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s100530070087
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
Schließen ⊗
Diese Webseite nutzt Cookies und das Analyse-Tool Matomo. Weitere Informationen finden Sie hier...