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  • 1990-1994  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    A differential retarding potential method for improving ion-beam kinetic energy resolution (1994)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 65 (1994), S. 3724-3728 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We present a differential retarding potential (DRP) method for improving the kinetic energy resolution of a reactant ion beam for scattering experiments. This method allows ion-molecule reaction absolute total cross-section measurements to be performed down to thermal energies using the simple electrostatic aperture ion lenses of a tandem quadrupole mass spectrometric ion-molecule reaction apparatus, even though the reactant ions are formed originally with a broad kinetic energy distribution. To illustrate the principle of the DRP method, examples are given for its application to reactant ion beams prepared in an electron impact ion source and in an ion-molecule reaction ion source. © 1994 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1145217
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Identification of the guest star of AD 185 as a comet rather than a supernova (1994)
    [s.l.] : Nature Publishing Group
    Nature 371 (1994), S. 398-399 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] On 7 December AD 185, astronomers at the imperial observatory of Lo-Yang in central China reported the appearance of a 'guest star' in the southern sky. This event was recorded originally in Houhanshu1, the official history of the Later Han dynasty (AD 23-220). Here we translate the original ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/371398a0
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    Paper (German National Licenses)
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