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  • 1
    Electronic Resource
    Electronic Resource
    Indirect processes in the electron-impact ionization of Li-like ions (1990)
    Springer
    The European physical journal 16 (1990), S. 113-127 
    Details
    ISSN: 1434-6079
    Keywords: 34.80.Dp ; 34.80.Kw ; 52.20.Fs
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Detailed measurements of electron-impact ionization cross sections have been made in the vicinity of the excitation-autoionization thresholds of Li-like B2+, C3+, N4+, O5+ and F6+ ions. With an energy spread of 0.4 to 1% of the electron energy and statistical uncertainties as low as 0.1% we could clearly resolve thresholds for excitation of individual terms in 1s2s2l configurations. Numerous resonance features were found which are due to dielectronic capture of the incident electron with subsequent two-electron emission. In particular, dielectronic capture processes involving Δn=2 excitations of a 1s electron provide the dominant resonance contributions to the measured cross sections. Rydberg series 1s2snln′l′ of resonances withn=3 (Δn=2) andn=4 (Δn=3) are resolved up to principle quantum numbersn′ equal to 6 or 7.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01679572
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Dielectronic recombination of lithium-like Ar15+ (1994)
    Springer
    The European physical journal 30 (1994), S. 291-306 
    Details
    ISSN: 1434-6079
    Keywords: 34.80.Kw
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Dielectronic recombination (DR) of Ar15+(1s 22s) ions was studied in a single-pass merged-beams experiment at the UNILAC (universal linear accelerator) of GSI. Absolute recombination rates and cross sections were measured for electron-ion center-of-mass energies from 0 to 580 eV. A number of Rydberg states formed by DR with 2s → 2p (Δn=0) and 2s → 3ℓ (Δn=1) core excitations and even individual terms in the 1s 23ℓ3ℓ′ configuration could be resolved. Theoretical calculations of DR cross sections are in good overall agreement with the data. In the calculations for Δn=0 transitions, effects of electric fields have to be included to reproduce the magnitude of the measured DR rates at the limit of the 2 p 1/2ℓ and 2 p 3/2ℓ Rydberg series. Discrepancies between theory and experiment are observed at the series limits of the (1s 23ℓnℓ′) Rydberg series.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01426394
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  • 3
    Electronic Resource
    Electronic Resource
    Doubly autoionizing capture resonances ine + Mg+ collisions (1990)
    Springer
    The European physical journal 15 (1990), S. 145-149 
    Details
    ISSN: 1434-6079
    Keywords: 34.80.DP ; 34.80.Kw ; 52.20.Fs
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Fine details in the cross section for electron impact ionization of Mg+ ions (configuration 1s 2 2s 2 2p 6 3s) have been measured with an energy resolution of 0.3 eV. Structure on top of a smooth direct-ionization “background” reflects the presence of indirect ionization mechanisms. Such contributions in a Na-like ion involvenon-resonant excitation of a 2p electron to singly autoionizing intermediate states subsequently decaying into the channel of net single ionization of the parent ion. We observe even stronger indirect contributions fromresonant excitation of a 2p electron with simultaneous dielectronic capture of the projectile electron into doubly autoionizing states which decay by successive emission of two electrons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01437008
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  • 4
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    Low-energy positron interactions with krypton (2011)
    American Physical Society (APS)
    Details
    Publication Date: 2011-03-31
    Description: Author(s): C. Makochekanwa, J. R. Machacek, A. C. L. Jones, P. Caradonna, D. S. Slaughter, R. P. McEachran, J. P. Sullivan, S. J. Buckman, S. Bellm, B. Lohmann, D. V. Fursa, I. Bray, D.W. Mueller, A. D. Stauffer, and M. Hoshino Cross sections for positron scattering from krypton have been measured with an energy resolution of ∼60 meV over the energy range 0.5–60 eV. Absolute values of the grand total (σ_{GT} ), positronium formation (σ_{Ps} ), and grand total minus positronium formation (σ_{GT} -σ_{Ps} ,) cross se... [Phys. Rev. A 83, 032721] Published Wed Mar 30, 2011
    Keywords: Atomic and molecular collisions and interactions
    Print ISSN: 1050-2947
    Electronic ISSN: 1094-1622
    Topics: Physics
    Published by American Physical Society (APS)
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  • 5
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    Double-K-vacancy states in electron-impact single ionization of metastable two-electron N5+(1s2s 3S1) ions (2014)
    American Physical Society (APS)
    Details
    Publication Date: 2014-07-10
    Description: Author(s): A. Müller, A. Borovik, Jr., K. Huber, S. Schippers, D. V. Fursa, and I. Bray The role of hollow states intermediately produced in electron-impact ionization of metastable He-like N5+(1s2s3S1) ions has been investigated in detail. A crossed-beam setup and suitable experimental techniques were employed for the measurement of accurate absolute cross sections and precise energy-... [Phys. Rev. A 90, 010701] Published Wed Jul 09, 2014
    Keywords: Atomic and molecular collisions and interactions
    Print ISSN: 1050-2947
    Electronic ISSN: 1094-1622
    Topics: Physics
    Published by American Physical Society (APS)
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  • 6
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    Indirect contributions to electron-impact ionization of ${\mathrm{Li}}^{+}$ ($1s2s\phantom{\rule{0.28em}{0ex}}^{3}S_{1}$) ions: Role of intermediate double-$K$-vacancy states (2018)
    American Physical Society (APS)
    Details
    Publication Date: 2018-02-27
    Description: Author(s): A. Müller, A. Borovik, Jr., K. Huber, S. Schippers, D. V. Fursa, and I. Bray Fine details of the cross section for electron-impact ionization of metastable two-electron Li + ( 1 s 2 s S 1 3 ) ions are scrutinized by both experiment and theory. Beyond direct knockoff ionization, indirect ionization mechanisms proceeding via formation of intermediate double- K -vacancy (hollow) states eit... [Phys. Rev. A 97, 022709] Published Mon Feb 26, 2018
    Keywords: Atomic and molecular collisions and interactions
    Print ISSN: 1050-2947
    Electronic ISSN: 1094-1622
    Topics: Physics
    Published by American Physical Society (APS)
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  • 7
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    The long term behaviour of Earth orbits and the implications for debris control (1985)
    In:  CASI
    Details
    Publication Date: 2006-02-14
    Description: GEO orbits with inclinations which remain less than 45 degrees are very stable. Although the inclination of the orbital plane may vary as much as 15 degrees over a period of about 50 years, the orbit altitude will always remain within a few hundred kilometers of geosynchronous altitude, GEO orbits with inclinations greater than 45 degrees exhibit remarkable instabilities ir the eccentricity due to gravitational resonance. Over a period of a century the eccentricity can reach such a large value that reentry is a possibility. The combined effects of the Sun, Moon, and oblate Earth play a significant role in determining the lifetime of a GEO transfer orbit. Depending on the initial orientation of the orbital plane with respect to the Sun and Moon, lifetimes may vary from under 6 months to over several hundred years. Transfer orbits with inclinations over 45 degrees show strong instabilities in the perigee altitude resulting in generally short lifetimes of less than a few years. All transfer orbits can be designed to decay within one year if the initial perigee altitude is less than 231 km. However, there are restrictions on orbit plane placement and time of year of launch.
    Keywords: ASTRODYNAMICS
    Type: NASA. Lyndon B. Johnson Space Center Orbital Debris; p 332-348
    Format: text
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  • 8
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    A singularity free analytical solution of artificial satellite motion with drag (1978)
    In:  CASI
    Details
    Publication Date: 2006-01-12
    Description: An analytical satellite theory based on the regular, canonical Poincare-Similar (PS phi) elements is described along with an accurate density model which can be implemented into the drag theory. A computationally efficient manner in which to expand the equations of motion into a fourier series is discussed.
    Keywords: ASTRODYNAMICS
    Type: NASA. Goddard Space Flight Center Flight Mechanics(Estimation Theory Symp.; p 33-36
    Format: text
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  • 9
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    Orbit decay analysis of STS upper stage boosters (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: An orbit decay analysis of the space transportation system upper stage boosters is presented. An overview of the computer trajectory programs, DSTROB, algorithm is presented. Atmospheric drag and perturbation models are described. The development of launch windows, such that the transfer orbit will decay within two years, is discussed. A study of the lifetimes of geosynchronous transfer orbits is presented.
    Keywords: ASTRODYNAMICS
    Type: NASA-CR-160385 , ACM-TR-119
    Format: application/pdf
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  • 10
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    An Analytical State Transition Matrix for Orbits Perturbed by an Oblate Spheroid (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: An analytical state transition matrix and its inverse, which include the short period and secular effects of the second zonal harmonic, were developed from the nonsingular PS satellite theory. The fact that the independent variable in the PS theory is not time is in no respect disadvantageous, since any explicit analytical solution must be expressed in the true or eccentric anomaly. This is shown to be the case for the simple conic matrix. The PS theory allows for a concise, accurate, and algorithmically simple state transition matrix. The improvement over the conic matrix ranges from 2 to 4 digits accuracy.
    Keywords: ASTRODYNAMICS
    Type: NASA-CR-151602 , ACM-TR-104
    Format: application/pdf
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