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  • 1
    Electronic Resource
    Electronic Resource
    Electron impact excitation cross section studies of methane and acetylene (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 2750-2764 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We have measured the electron impact emission cross sections for CH4 and C2H2 at 200 eV in a crossed beam laboratory system. Included in the study are all vacuum ultraviolet (VUV) emission features from 40 to 200 nm. The features are entirely from the atomic dissociation fragments (C i, C ii, and H). The Lyman series of H is observed to truncate near principal quantum number n=10 due to the long lifetime and to the high kinetic energy of the excited H fragments. The threshold region of the excitation functions has been measured at an energy resolution of 0.2–1.0 eV for the Lyman-α and Lyman-β transitions of H and C i (165.7, 193.1 nm) multiplets; and several distinct appearance potentials (AP) have been detected. For example, appearance potentials of Lyman-α from dissociation of CH4 and C2H2 are noted at several energies, including the first observations of a Lyman-α AP from C2H2 at 16.3 eV.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.452077
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  • 2
    Electronic Resource
    Electronic Resource
    No cometesimals in the inner Solar System (1988)
    [s.l.] : Nature Publishing Group
    Nature 335 (1988), S. 417-419 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Although Donahue et al1 claimed to find a cometary source of hydrogen, the estimated flux was ~ seven orders of magnitude smaller than required by the theory of Frank et al.2. But by postulating a different and more numerous kind of comet, Frank et al. have claimed3 that the Voyager data, the most ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/335417a0
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Detection of the hydroxyl radical in the Saturn magnetosphere (1993)
    [s.l.] : Nature Publishing Group
    Nature 363 (1993), S. 329-331 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Spectra of Saturn's magnetosphere were obtained in two sets of exposures on 24 and 26 August 1992. The observations were made from the dark Earth atmosphere, along a line of sight passing through the satellite plane and displaced by 4.5 Saturn radii (Rs) from the centre of Saturn on the local dusk ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/363329a0
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Hydrogen L β and L α emission lines observed from the interplanetary medium by the Voyager UV spectrometer (1978)
    [s.l.] : Nature Publishing Group
    Nature 274 (1978), S. 666-667 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Resonance scattering of sunlight by neutral hydrogen and helium of the interplanetary medium gives rise to diffuse emission over the whole celestial sphere. The line of sight column density varies with direction because the Solar System is moving through the local interstellar medium and the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/274666a0
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  • 5
    Electronic Resource
    Electronic Resource
    Galileo Ultraviolet Spectrometer experiment (1992)
    Springer
    Space science reviews 60 (1992), S. 503-530 
    Details
    ISSN: 1572-9672
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The Galileo ultraviolet spectrometer experiment uses data obtained by the Ultraviolet Spectrometer (UVS) mounted on the pointed orbiter scan platform and from the Extreme Ultraviolet Spectrometer (EUVS) mounted on the spinning part of the orbiter with the field of view perpendicular to the spin axis. The UVS is a Ebert-Fastie design that covers the range 113–432 nm with a wavelength resolution of 0.7 nm below 190 and 1.3 nm at longer wavelengths. The UVS spatial resolution is 0.4 deg × 0.1 deg for illuminated disc observations and 1 deg × 0.1 deg for limb geometries. The EUVS is a Voyager design objective grating spectrometer, modified to cover the wavelength range from 54 to 128 nm with wavelength resolution 3.5 nm for extended sources and 1.5 nm for point sources and spatial resolution of 0.87 deg × 0.17 deg. The EUVS instrument will follow up on the many Voyager UVS discoveries, particularly the sulfur and oxygen ion emissions in the Io torus and molecular and atomic hydrogen auroral and airglow emissions from Jupiter. The UVS will obtain spectra of emission, absorption, and scattering features in the unexplored, by spacecraft, 170–432 nm wavelength region. The UVS and EUVS instruments will provide a powerful instrument complement to investigate volatile escape and surface composition of the Galilean satellites, the Io plasma torus, micro- and macro-properties of the Jupiter clouds, and the composition structure and evolution of the Jupiter upper atmosphere.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00216866
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  • 6
    Electronic Resource
    Electronic Resource
    Ultraviolet spectrometer experiment for the Voyager mission (1977)
    Springer
    Space science reviews 21 (1977), S. 183-205 
    Details
    ISSN: 1572-9672
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The Voyager Ultraviolet Spectrometer (UVS) is an objective grating spectrometer covering the wavelength range of 500–1700 Å with 10 Å resolution. Its primary goal is the determination of the composition and structure of the atmospheres of Jupiter, Saturn, Uranus and several of their satellites. The capability for two very different observational modes have been combined in a single instrument. Observations in the airglow mode measure radiation from the atmosphere due to resonant scattering of the solar flux or energetic particle bombardment, and the occultation mode provides measurements of the atmospheric extinction of solar or stellar radiation as the spacecraft enters the shadow zone behind the target. In addition to the primary goal of the solar system atmospheric measurements, the UVS is expected to make valuable contributions to stellar astronomy at wavelengths below 1000 Å.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00200850
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    Paper (German National Licenses)
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