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  • Analytical Chemistry and Spectroscopy  (28)
  • Computational Chemistry and Molecular Modeling  (10)
  • ASTROPHYSICS
  • Lunar and Planetary Science and Exploration
  • Wiley-Blackwell  (38)
  • 1965-1969  (38)
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  • Wiley-Blackwell  (38)
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Year
  • 1
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 1 (1967), S. 595-604 
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On discute le calcul des polarisabilités des molécules sphériques du point de vue de l'approximation de l'énergie d'excitation moyenne de la théorie des perturbations. On démontre que, tandis qu'on peut toujours obtenir de l'information sur l'énergie dans des champs externes des phénomènes de polarisation, on peut aussi obtenir un peu d'information sur la fonction d'onde non perturbée de la susceptibilité magnétique et de l'effet Cotton-Mouton. Dans le cas de l'argon ces informations-ci s'accordent aux résultats des calculs SCF. On prédit les constantes de Cotton-Mouton pour le krypton et le xénon.
    Abstract: Die Berechnung der Polarisierbarkeiten sphärischer Moleküle wird im Lichte der Mittelanregungsenergieannäherung der Störungstheorie diskutiert. Es wird gezeigt dass, während Information von der Energie in äusseren Feldern immer aus Polarisationser-scheinungen erhalten werden kann, gewisse Information von der ungestörten Wellenfunktion auch aus magnetischen Susceptibilitäts und Cotton-Mouton Effektmessungen erhalten werden kann. Für Argon stimmte solche Information mit SCF-Berechnungen überein. Die Cotton-Mouton-Konstanten für Krypton und Xenon werden vorhergesagt.
    Notes: The calculation of the polarizabilities of spherical molecules is discussed in the light of the average excitation energy approximation to perturbation theory. It is shown that whilst information about the energy in external fields can always be obtained from polarization phenomena, some information about the unperturbed wave function also can be obtained from magnetic susceptibility and Cotton-Mouton effect measurements. In the case of argon such information was found to agree with the results of self-consistent-field calculations. Predictions of the Cotton-Mouton constants of krypton and xenon are made.
    Additional Material: 1 Ill.
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  • 2
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Polarization tensors are discussed in terms of their intrinsic symmetry group which is a direct product of the point group and the subgroup of the permutation group relevant to the experiment. The study of these latter groups is simplified by use of the isomorphism with certain point groups and permutations of suffixes can be visualized by rotations and reflections of the vertices of various objects in space. The approach unites the previous treatments and provides a means of constructing the bases for the irreducible tensor components. The difficulties introduced by Laplace's equation are explained and the information obtainable from induced birefringence experiments (Kerr and Cotton-Mouton effects) discussed for various systems.
    Additional Material: 13 Tab.
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  • 3
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 1 (1968), S. 613-615 
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Migration of the heteroatom substituent is an important feature in the mass spectra of β-chloro- and β-hydroxy-ethyl aryl sulphones. In these compounds the migratory aptitude of the heteroatoms appears to be greater than that of the hydrogen atoms.
    Additional Material: 1 Tab.
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  • 4
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The mass spectra of tetronic acid and of a number of its derivatives are recorded and discussed. Where necessary, the composition of the fragment ions has been checked by high resolution mass measurements. Fragmentation of the molecular ion is explained in terms of the rupture of a bond attached to C-4, and the predominant routes for many of the compounds can be explained on the basis of two schemes, the first involving preliminary ketonisation of the molecular ion, followed by elimination of carbon monoxide, the second involving rupture of the C-4—R3 bond prior to elimination of carbon monoxide. Special structural features, however, provide alternative routes.
    Additional Material: 6 Ill.
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  • 5
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 1 (1968), S. 913-914 
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The mass spectra of esters of the general formula MeO2C·[CF2]n·CO2Me, n = 6 to 9, are reported and briefly discussed. Common features of the mass spectra are prominent peaks at [M — CO2], [M — CO2 — C2F4] and [M — CO2 — 2C2F4].
    Additional Material: 1 Tab.
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  • 6
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 2 (1969), S. 209-212 
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The mass spectra of deuterated species shows that both the isomeric ions [CH2=SH]+ and [CH3—S]+ are formed in the ratio 2:1 from CH3SH; the ions [CH3CH=SH]+ and [CH3CH2S]+ in the ratio 0·8:1 from CH3CH2SH; and [CH2=OH]+ and [CH3—O]+ in the ratio 6·7:1 from methanol.The heats of formation of [CH3S]+ and [C2H5S]+ are of the order of 222 and 203 Kcal.mole-1 respectively. The isomeric ions cannot be distinguished on thermodynamic grounds.
    Additional Material: 2 Tab.
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  • 7
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 1 (1968), S. 527-530 
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Using energetic considerations, ketonic structures are postulated for the [M—olefin]+ fragments derived from alkoxybenzenes, alkylthiobenzenes and 9-ethoxyanthracene. Experimentally determined heats of formation for the tautomeric molecular ions derived from anthrone and 9-anthrol differ by 37 Kcal. mole-1.
    Additional Material: 2 Tab.
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  • 8
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Some esters of γ, δ-unsaturated or β-arylsubstituted acids undergo a peculiar transformation under electron-impact including an elimination of the alcohol residue as a radical R. with the following loss of the ketene molecule. One of the oxygen atoms of the carbonyl group enters an ion which is formed from an unsaturated part of the molecule. The possible mechanism of this reaction and the influence of structural modifications on the course of this process are discussed.
    Additional Material: 2 Ill.
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  • 9
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 1 (1968), S. 915-917 
    ISSN: 0030-493X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The electron-impact induced loss of CO2 from phthalanil and 4-phthalimidobiphenyl is paralleled by the formation of large amounts of CO2 on pyrolysis. CO is also a major pyrolysis product, but the loss of CO from these compounds under electron-impact is not an important fragmentation process.The mass spectra of meta and para-chlorophthalanils show prominent [M — CO2] peaks but the corresponding peak for the ortho isomer is of relatively low intensity. CO and CO2 are the principal gaseous products of the thermal decomposition of o-chlorophthalanil.
    Additional Material: 1 Tab.
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  • 10
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 3 (1969), S. 397-415 
    ISSN: 0020-7608
    Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Two-center one-electron integrals needed in certain molecular correlated wave function calculations, using one-center expansion approximation, have been studied. The form of the basic correlated function used in this study is \documentclass{article}\pagestyle{empty}\begin{document}$$ h(r_{12}) = r_{12}^n e^{ - \zeta r_{12} } $$\end{document} The parent integral is expressed in terms of an angular integral, and an auxiliary radial integral depending upon the variables r1, r2, and r12. Several analytical formulas, and a recursive formula are derived for the auxiliary integral, and other related integrals. All these formulas are given in computationally useful forms. Logical flow charts and FORTRAN programs were constructed for computing the basic integrals discussed in the paper. Numerical values of some integrals, thus obtained, are tabulated for comparisons.
    Additional Material: 1 Tab.
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