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  • 2000-2004  (4)
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  • 1
    Electronic Resource
    Electronic Resource
    Feasibility study of a new negative ion source using a transformer coupled plasma source : The 8th international conference on ion sources (2000)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 71 (2000), S. 943-945 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Multicusp volume ion sources with radio frequency (rf) antenna are well accepted negative ion sources except for the contamination problem from the rf antenna immersed in the plasma. The transformer coupled plasma (TCP) developed as high-density plasma sources for processing of microelectronics is newly recognized as a good candidate for negative ion sources without this contamination problem. High-density plasmas can be generated with the rf antenna outside of the plasma chamber separated by a dielectric window. Also, this high-density, high-temperature, heating region can be well separated from the negative ion extraction region where low electron temperatures are required. Moreover, TCP does not require a magnetic field for plasma generations; electron filtering with transverse magnetic field is compatible. Feasibility of the TCP negative ion source has been confirmed with plasma characteristics. Conceptual design of a new novel ion source based on the TCP source is performed. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1150352
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  • 2
    Electronic Resource
    Electronic Resource
    Ion-beam characteristics of novel helicon ion sources for different plasma parameters : The 8th international conference on ion sources (2000)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 71 (2000), S. 1385-1388 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A high-current ion source requires a high-density plasma source to provide sufficient ions to be accelerated. For a continuous high-power ion source, a new concept ion source using a helicon plasma source has been developed. A compact high-density helicon plasma is generated with very high-power efficiency, and ion beams are extracted from the plasma source. With various plasma parameters, extracted ion-beam characteristics are studied in a helicon ion source for the first time. Plasma parameters, especially plasma density, are shown to be strongly correlated with the extracted beam characteristics. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1150467
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Ammonia cluster anions and their relationship to ammoniated (solvated) electrons: The photoelectron spectra of (NH3)n=41–1100− (2002)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 116 (2002), S. 5731-5737 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We report the negative ion photoelectron spectra of (NH3)n=41–1100−, recorded using 2.540 eV photons. The largest cluster anion in this series has a diameter of approximately 4.3 nm. The vertical detachment energies (VDEs) of these cluster anions increase smoothly from 0.55 eV for n=41 to 1.05 eV for n=1100. The VDEs throughout this size range are linear with n−1/3 and extrapolate to a VDE (n=∞) value, which is very close to the measured photoelectric threshold energy of condensed phase ammoniated electrons. The linear extrapolation of this data to an analogous condensed phase property implies that these cluster anions are gas-phase counterparts to ammoniated electrons, i.e., they are embryonic forms of ammoniated electrons which will mature with increasing cluster size to become condensed phase-solvated electrons. The VDE data further implies that these embryonic ammoniated electrons were generated in solid ammonia environments, consistent with the source conditions under which they were produced. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1451057
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  • 4
    Electronic Resource
    Electronic Resource
    Fluctuations of the calcite compensation depth (CCD) in the East Sea (Sea of Japan) (2000)
    Springer
    Geo-marine letters 20 (2000), S. 20-26 
    Details
    ISSN: 1432-1157
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract Variations in the calcite compensation depth (CCD) in the East Sea (Sea of Japan) since the early middle Miocene were inferred from data on age-depth relationships, sediment carbonate, and benthic foraminifers from ODP sites 794, 795, and 797. The CCD remained relatively shallow during much of the middle Miocene–Pliocene, and deepened sharply at the beginning of the Pleistocene. Since then it has fluctuated rapidly, possibly in relation to the onset of the northern hemisphere glacial cycles in the late Pliocene. The average CCD has deepened since at least the early middle Miocene, coinciding with the long-term drop in eustatic sea level.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003670000029
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