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  • 1
    Electronic Resource
    Electronic Resource
    Formation of Small Iron Clusters in Circumstellar Envelopes (1997)
    Springer
    Astrophysics and space science 251 (1997), S. 219-222 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have investigated the role of small iron clusters as possible seeds for the formation of dust particles in circumstellar envelopes. Using cluster data available in the literature we constructed a simple cluster model in order to calculate the partition function and the Gibbs energy of formation for FeN clusters (N ≤ 19). Based on these data we have calculated the equilibrium densities of such clusters under different physical conditions. The results are discussed with respect to the problem of the primary dust condensate in M-type stars.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1000705214289
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Microwave detection of molecules formed by shock wave induced reactions (1998)
    Springer
    Shock waves 8 (1998), S. 385-388 
    Details
    ISSN: 1432-2153
    Keywords: Key words:Shock tube experiments, Formation of molecules, Microwave absorption technique
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics , Technology
    Notes: Abstract. The paper describes experimental investigations in a shock tube concerning the formation of new molecules using He as a driver gas and a mixture of Kr, CH $_4$ and NH $_3$ as driven gas, where Kr serves as diluant. By microwave absorption technique it was possible to detect HCN, CH $_2$ O and CH $_3$ NH $_2$ as reaction products. Obviously, these molecules were formed in the plasma behind the shock wave. In addition, the “swan bands” of C $_2$ have been observed with optical methods.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001930050132
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Infrared appearance of dynamical models for circumstellar dust shells around long-period variables (1995)
    Springer
    Astrophysics and space science 224 (1995), S. 329-332 
    Details
    ISSN: 1572-946X
    Keywords: hydrodynamics ; radiative transfer ; circumstellar shells ; carbon stars ; long-period variables ; dust ; stars: IRC +10216
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Synthetic brightness profiles resulting from consistent dynamical models for circumstellar dust shells around long-period variables are presented and discussed with respect to a corresponding observation of IRC +10216.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00667866
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Formation and photodestruction of pahs (1995)
    Springer
    Astrophysics and space science 224 (1995), S. 417-418 
    Details
    ISSN: 1572-946X
    Keywords: ISM : molecules ; Molecular processes ; circumstellar shells ; carbon stars
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Photodissociation processes of PAHs are studied in the interstellar medium (ISM) and in the envelopes of carbon-rich C-stars.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00667884
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  • 5
    Electronic Resource
    Electronic Resource
    Ab initio studies of stationary points of the Al O molecule (1998)
    Springer
    The European physical journal 2 (1998), S. 57-62 
    Details
    ISSN: 1434-6079
    Keywords: PACS. 33.15.-e Properties of molecules and molecular ions - 31.15.Ar Ab initio calculations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We report a theoretical ab initio investigation on energetically low-lying stationary points of the Al2O3 molecular system. The calculations were performed at the Hartree-Fock (HF) and second-order Møller-Plesset (MP2) frozen core level of approximation using the standard 6-31G(d) basis set. Several isomeric singlet as well as higher spin states of Al2O3 which lie close to each other within an energy range of about 8 eV (at MP2) are characterised. The lowest of these stationary points is in fact a triplet state of planar symmetry. It is by 0.08 eV (MP2) lower than the often discussed linear singlet state. Atomisation energies for all species are quite large showing that the system is strongly bound. Energies, harmonic vibrational modes, and geometric parameters are compared with the results of earlier work by Solomonik and Sliznev [1], Nemukhin and Weinhold [2], Andrews et al. [3] and Desai et al. [4]. Based on our calculations we give a tentative assignment of some selected vibrational wave numbers and an interpretation of some features of the photoelectron spectrum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100530050111
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  • 6
    Electronic Resource
    Electronic Resource
    Ab initio thermodynamic properties for different isomers of the Al O molecule (1999)
    Springer
    The European physical journal 6 (1999), S. 57-62 
    Details
    ISSN: 1434-6079
    Keywords: PACS. 33.15.-e Properties of molecules and molecular ions - 82.60.-s Chemical thermodynamics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We present ab initio thermodynamic properties for seven different geometric isomers of molecular Al2O3 over a wide temperature range. The rigid rotator-harmonic oscillator approximation is used to calculate the partition function as it is generally applied in thermodynamic studies of polyatomic molecules. The molecular data employed in setting up the partition functions are taken from the theoretical results of ab initio MP2/6-31G(d) calculations. An analysis of the effects of the various contributions is made. The resulting thermodynamic functions of Al2O3 are consistent with the JANAF thermochemical data compilation. Some thermochemical implications are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100530050284
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    Paper (German National Licenses)
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