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  • 1
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    Photodissociation lifetimes of CH and CD radicals in comets (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The rates of photodissociation of the CH radical from absorption of solar radiation are calculated to lie between 0.00416 and 0.0267/sec for heliocentric velocities between -42 and 42 km/sec at 1 AU from the Sun. For CD, the corresponding rates lie between 0.00433 and 0.0131/sec. The v'=0 level of the C2 sigma(+) is the main channel of CH as well as CD dissociation and, in each case, contributes over 77 percent of the total dissociation. The CH and CD radicals may be detectable in comets through absorption lines of the C2 sigma(+) - X2Di(r) electronic bands near 3143.2 and 3142.1 A, respectively.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: ESA, Proceedings of the International Symposium on the Diversity and Similarity of Comets; p 177-179
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  • 2
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    The anti-Th3P4-type structure in the lanthanum-rhodium system - La4Rh sub approximately 3 (1970)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Thorium phosphide anti-type microstructure of La-Rh system by X ray diffraction, discussing bcc structure, lattice constants, etc
    Keywords: CHEMISTRY
    Type: ; 17 (
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  • 3
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    The photodissociation lifetimes of the OH and OD radicals in comets (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The photodissociation rates of OH and OD molecules due to absorption of solar radiation in the X(2)Pi-A(2)Sigma(+) electronic transition are calculated to lie between 3.5 and 6.7 x 10 to the -6th/sec for OH for heliocentric velocities between -60 and +60 km/sec and at about 4.7 x 10 to the -7th/sec for OD at 1 AU from the sun. The corresponding lifetimes, which are upper bounds to the actual lifetimes, are generally consistent with the observational cometary data.
    Keywords: ASTROPHYSICS
    Type: Icarus (ISSN 0019-1035); 56; 184-189
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  • 4
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    Rigidity dependence for Forbush decreases in 1968 compared with that for the 11-year variation (1970)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Forbush decreases vertical cutoff rigidity dependence, comparing cosmic ray intensities from Pioneer 8 detector and ground based neutron monitors
    Keywords: SPACE RADIATION
    Type: ; ADEMIE DES SCIENCES
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  • 5
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    Intermediate phases in the lanthanum- and neodymium-cobalt systems. (1968)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Crystal structures of intermediate phases in La-Co and Nd-Co systems by powder X ray diffraction technique
    Keywords: PHYSICS, SOLID-STATE
    Type: ; TROPHYSICAL JOURNAL
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  • 6
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    The Nd-Rh system (1970)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Phase diagram of Nd-Rh system determined by powder X ray diffraction, metallography and differential thermal analysis methods
    Keywords: MATERIALS, METALLIC
    Type: ; ADEMIE DES SCIENCES
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  • 7
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    The lanthanum-rhodium system. (1969)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: La-Rh system study by powder X ray diffraction, metallographic and differential thermal analysis, constructing equilibrium diagram and determining crystal structure data
    Keywords: MATERIALS, METALLIC
    Type: ; VUE TECHNIQUE CECLES
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  • 8
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    What is new about the new Comet Yanaka (1988r)? (1993)
    In:  Other Sources
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    Publication Date: 2019-08-14
    Description: A deficiency in the observed abundances of C2 and CN in Comet Yanaka (1988r) is explained in terms of the properties of its organic refractory dust component and the fact that it is a new comet. Because the major fraction of the carbon in comets is in a mixture of complex organic molecules which earlier explained the 'missing' carbon mystery it is shown that substantial carbon depletions are impossible. The low C2 and CN production rates may be understood as consequences of Yanaka (1988r) being a new comet in combination with the small central area of coma observed. The surface of new comets resulting from cosmic-ray processing in the Oort cloud gives rise to dust which is relatively nonfragile and which remains relatively large and cool within the limits of a small diaphragm making the comet appear to be dust poor. This dust yields smaller abundances of carbon-rich species by evaporation than customary for the smaller and hotter fragmented particles further out in the coma.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X); 414; 1; p. L45-L48.
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  • 9
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    Dust release rates and dust-to-gas mass ratios of eight comets (1992)
    In:  Other Sources
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    Publication Date: 2019-08-14
    Description: Mass release rates of dust and mass ratios of dust-to-gas release rates of Comets Thiele (1985m), Wilson (1986l), P/Borrelly (1987p), Liller (1988a), Bradfield (1987s), Hartley-Good (1985l), P/Giacobini-Zinner (1984e), and P/Halley (1982i) are estimated from the analysis of continuum flux measurements at optical wavelengths. An attempt is made to estimate the size of each comet nucleus on the basis of water-ice sublimation (vaporization), assuming that the nucleus is spherical and only a fraction of its surface area is active. Where possible, the dust mass release rates are compared with those obtained by other investigators in the optical and IR wavelength regions. Good agreement with results based on IR observations is found.
    Keywords: ASTROPHYSICS
    Type: Astronomical Journal (ISSN 0004-6256); 104; 2 Au; 848-858
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  • 10
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    The states of carbon and nitrogen atoms after photodissociation of CN, CH, CH(+), C2, C3, and CO in comets (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The photodissociation of carbon compounds by solar UV radiation at a heliocentric distance of 1 AU is examined, comparing published observational data with the predictions of theoretical models and results from laboratory experiments. It is shown that species other than CO, including CN, CH, CH(+), C2, and C3, can contribute to the observed brightness of the VUV lines of C I (156.1, 165.7, and 193.1 nm) and C II (133.5 nm) in comet comae. CN photodissociation is also found to produce metastable 2D0 and 2P0 N I atoms, possibly leading (at heliocentric distances less than 0.25 AU) to 143.9-nm emission via resonance fluorescence.
    Keywords: ASTROPHYSICS
    Type: Icarus (ISSN 0019-1035); 90; 74-78
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