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  • LUNAR AND PLANETARY EXPLORATION  (4)
  • 34.70  (3)
  • 1
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    Laser Ar-39-Ar-40 study of Apollo 17 basalts (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Three Apollo 17 basalts were studied by the laser Ar-39-Ar-40 method. The 70215 basalt has a normal well-behaved Ar-39-Ar-40 release pattern; the 70017 basalt has a disturbed release pattern which indicates a limited intermediate maximum age followed by a broad low-age region; and the 75035 basalt has a pattern initially similar to 70017 that is followed by a high-temperature maximum age. The laser study shows that all mineral systems in 70215 have small and uniform temperature losses, while the laser-determined ages for 70017 and 75035 are, apparently, primarily controlled by the minerals containing mesostasis inclusions. It is possible that the drop in ages observed by the conventional Ar-39-Ar-40 method was due not only to recoil of Ar-39 during neutron irradiation but also to gas loss from some minerals. It is suggested that the plagioclases are the best minerals to use for a reliable age.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar Science Conference; Mar 14, 1977 - Mar 18, 1977; Houston, TX
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Laser /39/Ar-/40/Ar dating of two clasts from consortium breccia 73215 (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A laser Ar-39-Ar-40 study of the components of an ANT-suite anorthositic gabbro and a black aphanite from a consortium breccia is reported. A wide range of K-Ar ages is found for the plagioclase in the anorthositic gabbro; at the centers of the largest grains is material showing the greatest age (older than 4.11 billion years) while the youngest material (3.81-3.88 billion years) is found near the grain margins. Partial outgassing of the clasts upon incorporation into the breccia could account for the age patterns. The black aphanite clast appears to be cogenetic with the aphanite that forms the breccia matrix. The time of crystallization of a lunar granite has also been measured by the laser technique.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar and Planetary Science Conference; Mar 13, 1978 - Mar 17, 1978; Houston, TX
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Laser probe /Ar-39/-/Ar-40/ dating of materials from consortium breccia 73215 (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The unique capacity of the laser-probe (Ar-39)-(Ar-40) method to determine ages of constituents in a rock sample which are only of the order of 100 microns apart has been applied to measure ages of the different constituents of consortium breccia 73215. Evidence is given that the age of the melt-derived ground mass, 4.01 + or - 0.05 billion years, has no chronological significance. Instead, the best estimate for the age of the breccia-forming event, about 3.90 billion years, comes from the study of two clasts only a few hundred micrometers in size. The interpretation of this age as the age of the breccia-forming event is also supported by the studies of other consortium members and suggests a reinterpretation of the ages of most of the other Apollo 17 highland breccias.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar Science Conference; Mar 14, 1977 - Mar 18, 1977; Houston, TX
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Helium, neon, and argon on sunlit and shaded surfaces of lunar rock 12054 (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar Science Conference; Mar 14, 1977 - Mar 18, 1977; Houston, TX
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
    Electronic Resource
    Electronic Resource
    Electron emission in collisions of slow rare gas ions with partially cesiated W (110) (1993)
    Springer
    The European physical journal 28 (1993), S. 109-118 
    Details
    ISSN: 1434-6079
    Keywords: 32.80.D,H ; 34.70 ; 79.20.N
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We report the spectra of electrons emitted after slow collisions (50 eV) of rare gas ions (He+, Ne+, Ar+, and Xe+) with partially cesiated W(110) surfaces. The electron spectra are discussed in terms of the two interatomic Auger processes, Auger Capture and Auger Deexcitation and the intra-atomic Auger process, Autodetachment of Rg−* (He−* (1s 2s 2 2 S) in the case of He). Model calculations including these processes can qualitatively reproduce the measured spectra as well as experimental values for the electron emission coefficients, γ. This is demonstrated for collisions of He+ ions and thermal metastable He atoms with clean and partially cesiated W(110).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01436976
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Electron emission in slow collisions of K+ ions with alkalated (K, Cs) W(110) surfaces (1991)
    Springer
    The European physical journal 21 (1991), S. 11-18 
    Details
    ISSN: 1434-6079
    Keywords: 32.80D ; 34.70 ; 79.20.N
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have investigated K+ collisions (200 to 1000 eV) under grazing incidence with partially alkalated (K, Cs) W(110) surfaces by energy analysis of the ejected electrons. Three different mechanisms for electron emission could be identified (1) Kinetic emission mainly confined to projectile energies greater than 300 eV, (2) Auger deexcitation of excited projectile valence states yielding electrons with energies up to about 2.9 eV and (3) Creation of inner shell vacancies (Cs(5p −1) and K(3p −1)) which gives rise to Auger type processes (OVV and MVV) and to the formation of autoionizing states of the type A (np 5 n′s n″l) (A=Alkali atom). The relative importance of the three mechanisms is studied as a function of the alkali coverage of the surface and of the projectile's energy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01426612
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  • 7
    Electronic Resource
    Electronic Resource
    Intra- and inter-atomic auger processes in collisions of low energy He++, He+, He* (23,S, 21 S) and Li+ with Li covered W(110) surfaces (1992)
    Springer
    The European physical journal 22 (1992), S. 563-568 
    Details
    ISSN: 1434-6079
    Keywords: 32.80.D ; 34.70 ; 79.20.N
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Electron spectra from He++, He+ and Li+ (10 to 1500 eV) ions colliding under grazing incidence with Li covered W (110) surfaces are reported. The results are compared with those obtained from thermal collisions of (23 S; 21 S) metastable He atoms. In these collisions 1s vacancies are either produced during the collision event (energetic He+ (Li +) collisions) or are brought into the collision (slow He++ (He+, He*) collisions). Population of the 2s orbitals by two electrons produces states which decay by intraatomic Auger processes: we observe autoionization of He** (2s 2) and Li** (1s 2s 2) as well as autodetachment of He−* (1s 2s 2). Alternatively the 1s-holes in the projectile or target (Li) can be filled by Auger processes involving one or two surface electrons. The processes leading to electron emission are studied as a function of the Li coverage in the submonolayer region (0≦ΘLi≦1Ml) and as a function of the projectile energy. It is concluded that with one or two 1s vacancies present in the projectile the double capture of two surface electrons constitutes an important process responsible for electron emission of low work function surfaces.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01426356
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    Paper (German National Licenses)
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