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  • CHEMISTRY  (41)
  • 1970-1974  (41)
  • 1973  (41)
  • 1
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    Classical dynamical investigations of reaction mechanism in three-body hydrogen-halogen systems. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Keywords: CHEMISTRY
    Type: Journal of Chemical Physics; 58; Apr. 1
    Format: text
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  • 2
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    Fluorinated esters of polycarboxylic acids (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Fluorine containing esters of polycarboxylic acids are discussed. The use of these esters as extreme temperature lubricants and base fluids for greases is investigated.
    Keywords: CHEMISTRY
    Format: application/pdf
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  • 3
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    He, Ne and Ar in chondritic Ni-Fe as irradiation hardness sensors. (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Noble gas analyses of the Ni-Fe of 9 L, 5 H, and 2 LL chondrites quantitatively support previous suggestions of radiogenic He-4 recoil and He-3 deficits. Furthermore, noble gases in the Ni-Fe show evidence for in situ produced radiogenic He-4 and in some cases for recoil loss of Ar-38 and gain of Ne-21. The ratio of spallogenic Ar-38 and Ne-21 in the metal phase is found to correlate strongly with He-3/Ne-21 and Ne-22/Ne-21 in bulk samples of these chondrites. This is proof of the dependence of these ratios on the irradiation hardness experienced by the meteoroid in space. 'Hardness indices' n equals 1.9-2.2 are found, indicating that on the average the stone meteoroids from which the samples came were smaller in mass than iron meteoroids. The spallogenic Ne-21/Ar-38 ratio in metallic Ni-Fe can be used with the semi-empirical production model deduced from the Grant iron meteorite to calibrate spallogenic He-3/Ne-21 and Ne-21/Ar-38 in bulk samples of L, LL and H chondrites for meteoroid size and sample location allowing the estimation of minimal meteoroid masses.
    Keywords: CHEMISTRY
    Type: Geochimica et Cosmochimica Acta; 37; July 197
    Format: text
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  • 4
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    Selected Apollo 17 soils - Mineralogy and geochemistry of opaque and non-opaque phases (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Soil samples 74220 ('orange soil'), 74241 and 75081 were sized, and the compositions of the opaque and silicate phases were determined. The ilmenites, particularly in 74241, contain up to 7.8 wt % MgO and display higher bireflectance than low-Mg ilmenites. They commonly contain exsolution-like chromite and rutile and occasionally are in association with native Fe in an assemblage probably resulting from reduction. The chromian ulvospinels are similar to Apollo 11 spinels in that they contain near-equal amounts of chromite and ulvospinel molecules. No primary chromites were observed. Most native Fe has No and Co contents of less than 1 wt %; some in 74220 contained 5-6% Ni and less than 1% Co in association with schreibersite.
    Keywords: CHEMISTRY
    Type: Earth and Planetary Science Letters; 21; 1, De; Dec. 197
    Format: text
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  • 5
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    Prohibited autodetachment in OD- formed by collisions of O- with D2. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Keywords: CHEMISTRY
    Type: Journal of Chemical Physics; 58; Feb. 1
    Format: text
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  • 6
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    Botryococcene - A tetramethylated acyclic triterpenoid of algal origin (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The green alga Botryococcus braunii, implicated in the formation of certain geological deposits, produces unusual isomeric C34H58 alkenes, botryococcene and isobotryococcene, during a particular physiological state. A structure for botryococcene is suggested, taking into account NMR techniques, oxidative degradation, and established biosynthetic principles. Botryococcene appears terpenoid in origin.
    Keywords: CHEMISTRY
    Type: Chemical Communications; 1973
    Format: text
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  • 7
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    Access to uncombined titanium through an inhibiting film in sublimation pumping of deuterium. (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Experimental demonstration of the possibility to gain access to sublayers of uncombined titanium through an inhibiting surface film in titanium bulk sublimator pumping by adding a thin layer of titanium to an apparently occluded surface. Though most of the work described was directed toward more effective utilization of titanium in bulk sublimation pumping for small positive-ion accelerators, the results presented should be of interest to others concerned with hydrogen pumping in general and the problems associated with inhibiting films.
    Keywords: CHEMISTRY
    Type: Journal of Vacuum Science and Technology; 10; Jan
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  • 8
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    The hydroperoxyl radical in atmospheric chemical dynamics - Reaction with carbon monoxide. (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Discussion of laboratory measurements which indicate that the reaction of the thermalized HO(2) radical with CO is exceedingly slow and that this reaction should not, therefore, be of any significance in atmospheric chemistry. The large discrepancy between the new results and data obtained earlier by Westenberg and de Haas (1972) is explained in terms of the reacting hydroperoxyl radical being in a non-Boltzmann distribution in the former study. It appears that the most important reactions of thermalized HO(2) in the atmosphere are those involving the trace gases of NO and sulfur dioxide.
    Keywords: CHEMISTRY
    Type: Science; 179; Jan. 19
    Format: text
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  • 9
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    Photochemistry of interstellar molecules (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The role of photochemistry in determining the lifetime of interstellar molecules is considered. The probability of photodecomposition depends on three factors, including the absorption cross section, the quantum yield or probability of dissociation following photon absorption, and the interstellar radiation field. A more detailed discussion of the photochemistry of five molecules is presented, giving attention to carbonyl sulfide, methyl acetylene, nitric oxide, acetylene, and benzene. Lifetimes of interstellar molecules in unobscured regions are in the range from 5 to 100 years. It is concluded that polyatomic molecules can exist only in dense clouds which protect them from the full interstellar radiation field.
    Keywords: CHEMISTRY
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  • 10
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    Atomic recombination rate determination through heat-transfer measurement. (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: A theoretical and experimental demonstration is presented which shows that under suitable conditions the volume recombination coefficient can be determined by measuring the heat transfer rate into the wall of a cylinder through which a dissociated stream is passing. The experimental results obtained are in agreement with those of other investigators.
    Keywords: CHEMISTRY
    Type: AIAA Journal; 11; Mar. 197
    Format: text
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