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  • LUNAR AND PLANETARY EXPLORATION  (5)
  • ATOMIC AND MOLECULAR PHYSICS  (1)
  • 2010-2014
  • 1980-1984  (6)
  • 1975-1979
  • 1970-1974
  • 1955-1959
  • 1950-1954
  • 1982  (6)
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  • 2010-2014
  • 1980-1984  (6)
  • 1975-1979
  • 1970-1974
  • 1955-1959
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  • 1
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    Spectrum and energy levels of triply ionized yttrium/Y IV/ (1982)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Optical Society of America; vol. 72
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Carbon, hydrogen and nitrogen isotopes in solvent-extractable organic matter from carbonaceous chondrites (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: CCl4 and CH3OH solvent extractions were performed on the Murray, Murchison, Orgueil and Renazzo carbonaceous chondrites. Delta-D values of +300-+500% are found in the case of the CH3OH-soluble organic matter. The combined C, H and N isotope data makes it unlikely that the CH3OH-soluble components are derivable from, or simply related to, the insoluble organic polymer found in the same meteorites. A relation between the event that formed hydrous minerals in CI1 and CM2 meteorites and the introduction of water- and methanol-soluble organic compounds is suggested. Organic matter soluble in CCl4 has no N, and delta-C-13 values are lower than for CH3OH-soluble phases. It is concluded that there either are large isotopic fractionations for carbon and hydrogen between different soluble organic phases, or the less polar components are partially of terrestrial origin.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Geochimica et Cosmochimica Acta; 46; Jan. 198
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    The concentration and isotopic composition of hydrogen, carbon and nitrogen in carbonaceous meteorites (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Stepwise pyrolysis was used to extract H2, N2 and C from powdered meteorites and from meteorite residues resulting from partial dissolution in aqueous HF or from reaction with HF-HCl solutions. Concentrations and isotopic compositions were determined for the cases of the carbonaceous chondrites Orgueil, Murray, Murchison, Renazzo and Cold Bokkeveld. Acidification of the meteorites removed the organic sources of H2, so that H2 in the HF-HCl acid residues came mostly from the insoluble organic matter making up 70-80% of the total carbon in carbonaceous meteorites. Good correlation is found between delta-D and the concentration of H2 in the acid residues, but no correlation exists between the delta-D, delta-C-13 and delta-N-15 in them. A model is proposed for both the high delta-D values and the relationship between those values and the H2 concentration.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Geochimica et Cosmochimica Acta; 46; Jan. 198
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  • 4
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    Shock-induced devolatilization of calcite (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Experimental measurements of the release adiabats by Vizgirda (1981) indicate that substantial vaporization takes place upon release from shock pressures of 37 GPa for calcite and 14 GPa for aragonite. The present investigation includes the first controlled partial vaporization experiments on calcite. The experiments were conducted to test the predictions of the release adiabat experiments. The quantities of the gaseous species produced from shocked calcite and their carbon and oxygen isotopic compositions were determined, and the shock-induced effect on the Mn(2+) electron spin resonance spectrum in the shock-recovered calcite was observed. On the basis of the obtained results, it is concluded that shock stresses at the 17-18 GPa level give rise to volatilization of 0.03-0.3 (mole) percent of calcite to CO2 and CO. The devolatilization of calcite occurs at low pressure at significantly lower entropy densities than predicted on the basis of thermodynamic continuum models.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Earth and Planetary Science Letters; 61; 1; Nov. 198
    Format: text
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  • 5
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    Silicon and oxygen isotopes in selected Allende inclusions (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Silicon and oxygen data are presented for a number of Allende samples. It is found that based on oxygen and silicon isotopes, Allende samples EGG-1, EGG-6, BG1a, and 3529Yc are typical, unfractionated Allende inclusions. Where magnesium data are available, they indicate the same thing. EGG-3 is fractionated in both oxygen and silicon, as it is in magnesium. Sample D7 melilite is fractionated in oxygen by several per mil along the C2-matrix line, away from typical Allende melilites. Inclusion BG10a is a FUN inclusion with an inferred original oxygen isotopic fractionation of 8-9 per mille/amu relative to the Allende line. Silicon data for two density fractions of inclusion 3A with different mineralogies show a difference of about 2 per mille, which indicates that silicon, like oxygen, has been added to at least some mineral phases in Allende inclusions from a reservoir other than the one in which the inclusion first began to form.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar and Planetary Science Conference; Mar 16, 1981 - Mar 20, 1981; Houston, TX
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Carbon isotopic ratios in some low-delta N-15 lunar breccias (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Lunar soil breccias 10018, 79035 and 79135 were analyzed for carbon and nitrogen contents and isotopic compositions by vacuum pyrolysis, with a 500 C pre-combustion step in some cases. The combustion was used to remove carbon of terrestrial origin. Nitrogen isotopic ratios for the breccias are very low and are in agreement with results in the literature. Nitrogen yields in two cases were lower than literature values, a result attributable to heterogeneous mixing of implanted and implantation-free components in the breccias. Carbon isotopic ratios were found to be low in these breccias, even when reasonable account is taken of terrestrial carbon contamination. The results are consistent with the idea that low-delta N-15 values in lunar soils and breccias are accompanied by low-delta C-13 values, and imply that any secular variation which occurred in the delta N-15 of nitrogen implanted in lunar soils was accompanied by a similar but smaller variation in the delta C-13 of implanted carbon.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar and Planetary Science Conference; Mar 16, 1981 - Mar 20, 1981; Houston, TX
    Format: text
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