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  • 1
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    Discovery of the first Quaternary maar in the Bohemian Massif, Central Europe, based on combined geophysical and geological surveys (2009)
    In:  EPIC3Journal of Volcanology and Geothermal Research, 182(1), pp. 97-112
    Details
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 2
    Electronic Resource
    Electronic Resource
    Saturation of a convective instability due to trapped particles
    Amsterdam : Elsevier
    Physics Letters A 43 (1973), S. 45-46 
    Details
    ISSN: 0375-9601
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0375-9601(73)90537-9
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  • 3
    Electronic Resource
    Electronic Resource
    Electron heating by beam-plasma interaction in uniform magnetic field
    Amsterdam : Elsevier
    Physics Letters A 28 (1968), S. 331-332 
    Details
    ISSN: 0375-9601
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0375-9601(68)90316-2
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  • 4
    Electronic Resource
    Electronic Resource
    Energy lost by an electron beam in interaction with a plasma
    Amsterdam : Elsevier
    Physics Letters A 45 (1973), S. 421-422 
    Details
    ISSN: 0375-9601
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0375-9601(73)90267-3
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  • 5
    Electronic Resource
    Electronic Resource
    Finite-size effects in ionization potentials and electron affinities of metal clusters (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 1295-1303 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Experimental ionization potentials (I) and electron affinities (A) of metal clusters MeN are compiled for a variety of systems and their size dependence is analyzed. In the theoretical part, we perform semiclassical density variational calculations using the spherical jellium model and the local density approximation. For alkali systems and, to some extent, also for some nonalkali systems, the calculated values of I and A reproduce very well the average size dependence of the measured quantities, if their common bulk limit W is adjusted to the experimental bulk work function. This holds even for rather small systems where I and A are no longer linear in N−1/3. We discuss the extent to which classical models for the energetics of charged metal spheres can account for the correct size dependence in the large-cluster limit. We point out that the deviation of the slope parameters α and β in the asymptotic expressions I∼W+α(e2/rs)N−1/3, A∼W−β(e2/rs)N−1/3 from the values (1)/(2) , which depends on the material via the Wigner–Seitz parameter rs, can be entirely accounted for by quantum-mechanical effects, namely the kinetic, exchange, and correlation energies and the diffuseness of the electron density.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.461111
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  • 6
    Electronic Resource
    Electronic Resource
    Negative surface ionization of hydrogen atoms and molecules (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 2896-2901 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The total yield of H− ions, Y(Ein), produced in backscattering of low-energy H+ and H+2 ions from polycrystalline gold, tungsten, and molybdenum converter surfaces was measured at normal incidence in the energy range Ein=2–30 eV per nucleus. The yield per nucleus is independent of the ion mass. This indicates that the molecular ions are dissociated before colliding with the converter surface. A universal expression for Y(Ein) was developed by combining the electron tunneling theory with atomic scattering theory. This expression agrees well with measurements. The yield is completely characterized by two parameters, Eth/RE and RNη0, which can be determined experimentally: Y=0 for Ein=Eth/RE, and Y approaches the maximum yield Rη0 as Ein increases. These parameters were determined from measured H− yields in ion beam backscattering experiments, as well as for backscattering of thermal distributions of hydrogen atoms. For beam experiments, the maximum yield of 0.3 per nucleus was obtained for Mo/Cs converters with 1.5 eV work function. A higher maximum yield of 0.42 was obtained from experiments on backscattering thermal distributions of H atoms. This is attributed to high extraction fields. The universal yield formula made it possible to compare the results of the two different types of experiments. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361285
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  • 7
    Electronic Resource
    Electronic Resource
    Catalytic oxidation of silicon by cesium ion bombardment (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 452-458 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Results for room-temperature oxidation of silicon using cesium ion bombardment and low oxygen exposure are presented. Bombardment with cesium ions is shown to allow oxidation at O2 pressures orders of magnitude smaller than with noble gas ion bombardment. Oxide layers of up to 30 A(ring) in thickness are grown with beam energies ranging from 20–2000 eV, O2 pressures from 10−9 to 10−6 Torr, and total O2 exposures of 100 to 104 L. Results are shown to be consistent with models indicating that initial oxidation of silicon is via dissociative chemisorption of O2, and that the low work function of the cesium- and oxygen-coated silicon plays the primary role in promoting the oxidation process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347684
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  • 8
    Electronic Resource
    Electronic Resource
    A new solid-state cesium ion source (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 2704-2710 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A novel Cs+ion source combining the advantages of porous metal ionizers with those of zeolite emitters has been developed. Cesium ions are chemically stored in a cesium-mordenite solid electrolyte (Cs-M SE) pellet whose emitting surface is coated with a porous tungsten thin film. Cesium supply to the emitting surface is controlled by a voltage applied across the solid electrolyte pellet. Cs+ ion emission takes place on the surface of the porous tungsten electrode by surface ionization. The ionic conductivity of Cs+ ion in the Cs-M SE is of order of 10−5 Ω cm−1 at 1000 °C. The interface properties between electrolyte and electrodes play a major role in the cesium ion source. The cathode electrode interface (emitting electrode) determines the stability of the supply current density to the emitting surface. The lifetime of the source is found to depend on the anode interface. In a steady-state operation, an ion-emission current density of the order of 20 mA/cm2 has been extracted for 30 h at a total ion-emission current of 100 μA at 1000 °C. This corresponds to 10 C of extracted charge.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.345458
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  • 9
    Electronic Resource
    Electronic Resource
    An arc discharge hydrogen atom source (1993)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 64 (1993), S. 2746-2752 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A magnetically confined thermal electric arc gas heater of easy construction, handling, and maintenance has been designed, built, and tested as a suitable source of heat for dissociating hydrogen molecules. The plasma species in the gas discharge region are assumed to satisfy local thermodynamic equilibrium conditions. The average beam kinetic energy is determined to be 1.5 eV, leading to an arc temperature of approximately 8700 K; the dissociation rate is 0.5 atoms per molecule and the total atom beam intensity in the forward direction is 1018 atoms/sr s. This novel atom source has been successfully ignited and operated with pure hydrogen during several hours of continuous performance, maintaining its characteristics and overcoming some of the difficulties previously found by researchers using other arc sources. The hyperthermal hydrogen atom beam obtained from this source is identified by MoO3 chemical detectors, and analyzed and characterized by three different calorimetric sensors, Ni, Ta, and Teflon. The experimental results obtained with this dissociator agree with those published in the literature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144413
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  • 10
    Electronic Resource
    Electronic Resource
    Solid-state cesium ion gun for ion beam sputter deposition (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 5671-5673 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A compact cesium ion gun, suitable for ion beam sputter deposition in high vacuum environment, has been developed. The gun uses a solid-state cesium ion source described previously. This gun is compact, stable, and easy to use. It requires none of the differential pumping or associated hardware necessary in designs using cesium vapor and porous tungsten ionizers. The gun produces a cesium ion beam of 0.2 mA at 5 keV. A beam diameter of 0.2 cm is measured at a target which is 3 cm apart from the exit aperture of the accelerator electrode. The sputter deposition rate is of the order of 100 A(ring)/min for several metal targets such as Au, Cu, Mo, W, and Ta, measured at 4 keV primary Cs+ ion beam energy and in a distance of 1.5 cm from the target. The lifetime of this gun is more than 20 C of cesium, which corresponds to 60 h of operation with an extraction current of 0.1 mA.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143347
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