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  • Articles  (38)
  • Wiley-Blackwell  (35)
  • American Institute of Physics (AIP)  (3)
  • Oxford University Press
  • Chemistry and Pharmacology  (38)
  • 1
    Electronic Resource
    Electronic Resource
    Two-laser resonance-enhanced photoionization spectrum of benzene (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 3490-3497 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: This paper reports results of an experiment involving two-laser resonance-enhanced photoionization of benzene. The excitation sources were two frequency-doubled dye lasers. The first laser pumped the molecule to a selected vibronic level of its first excited singlet state (1B2u), from where it was ionized by a time-delayed pulse of the second laser. The ion yield depends on the intermediate vibronic state as well as on the wavelength of the ionizing laser. From the structures and intensities of the measured ion spectra we derived vibrational frequencies and molecular parameters of the ground electronic state of the ion to a remarkable accuracy. The contributions of autoionizing Rydberg levels to the ionization cross section can clearly be distinguished from direct ionization. Several resonance peaks were assigned to transitions to vibrational modes within these Rydberg states.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455859
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  • 2
    Electronic Resource
    Electronic Resource
    A laser-induced fluorescence and information-theory investigation of energy transfer processes in benzene–argon collisions (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 82 (1985), S. 810-821 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: This paper reports the results of an extensive study of the internal energy-transfer processes that occur in benzene–argon collisions. We used laser-induced fluorescence and information theory for determining the energy-transfer rates between internal states of benzene in the ground electronic state (1A1g). The method provides an estimate for the rate of rotational relaxation. It gives a measure of the fraction of molecules that absorb the laser radiation at a frequency near the center of the ν18 absorption band of benzene. The use of information theory gives estimates for all of the vibrational energy transfer rates. These fit the experimental data reasonably well. However, some of the data do deviate from the information theory model. This suggests that the statistical assumptions of the model are not sufficiently restrictive. One such restriction may be in the number of vibration quanta changing per collision..
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.448507
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of the Onsager coefficient and internal relaxation modes on spinodal decomposition in the high molecular isotopic blend polystyrene/deutero-polystyrene studied with small angle neutron scattering (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 104 (1996), S. 5326-5337 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The early state of spinodal decomposition was studied by small angle neutron scattering in the critical mixture of the isotopic blend deutero-polystyrene/polystyrene (d-PS/PS) of equal molecular volume of 1.42×106 cm3/mol in a temperature range 12 K≤||Tc−T||≤82 K. This process can be described by the relaxation between two static structure factors, S(Q) representing the equilibrium values of the system in the mixed state and at the temperature where phase separation occurs. The time evolution of the relaxation process is described by the dynamical structure factor, L(Q,t) which depends on the dynamic properties of the mixture. It will be shown that the static structure factor of a mixed system can also be determined in the unstable two-phase region during the early state of spinodal decomposition. Consistent values for the Flory–Huggins parameter were found in comparison with a lower molecular d-PS/PS sample and, therefore, a lower critical temperature which was even smaller than the phase separation temperatures of the present system.The observed time evolution of the fluctuation modes is nonexponential. Therefore, it was originally supposed that internal modes of the coil come into play. The analysis of the data with an ansatz by Akcasu, which takes internal modes into account showed, however, that the phase separation in the experimental range of wave number and time is dominated by the centre of mass diffusion as in the C–H–C case and the nonexponential behavior was attributed to a time dependent increase of the "range'' of the Onsager coefficient. A range of the Onsager coefficient larger than the radius of gyration of a single coil is predicted in case of entangled polymers. However, no time dependence was predicted so far. The evaluated diffusion constants follow an Arrhenius behavior and are consistent with earlier studies. They show a D0∝N−2 scaling consistent with reptation. A further result is the observation of a second order peak in the structure factor already in the early times of spinodal decomposition. So far, this was only attributed to the late state of spinodal decomposition. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.471262
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  • 4
    Electronic Resource
    Electronic Resource
    Studien zur Verzweigung von Kettenmolekülen. X. Untersuchungen zur Kurzkettenverzweigung des HochdruckpolyethylensIX: Faserforsch. u. Textiltechnik/Z. Polymerforsch. 29 (1978) 521-525. (1979)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 30 (1979), S. 557-562 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The short chain branching in low density polyethylene obtained under various conditions were determined by γ-irradiation followed by gaschromatography of the gaseous scission products. The pressure and temperature of polymerization were found to affect the kind and number of branchings. The branching structure and reaction parameters are related and discussed on a kinetic concept.
    Notes: Die Kurzkettenverzweigung von unter verschiedenen Bedingungen synthetisierten Hochdruckpolyethylenen wurde mit Hilfe der γ-Bestrahlung und nachfolgender gaschromatographischer Analyse der Spaltgase bestimmt. Es wurde experimentell belegt, daß Reaktionsdruck und Polymerisationstemperatur Art und Anzahl der Seitenzweige beeinflussen. Verzweigungsstruktur und Reaktionsparameter werden zueinander in Beziehung gesetzt und auf der Grundlage kinetischer Überlegungen diskutiert.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1979.010300905
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  • 5
    Electronic Resource
    Electronic Resource
    Ueber Verbindungen der Sulphate des Cadmiums und Zinks mit Ammoniak; (1869)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 149 (1869), S. 70-75 
    Details
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.18691490110
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  • 6
    Electronic Resource
    Electronic Resource
    38) Weitere Mittheilungen über Verbindungen des Zinksulfats mit Ammoniak (1869)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 151 (1869), S. 213-215 
    Details
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.18691510209
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  • 7
    Electronic Resource
    Electronic Resource
    Studien zur Verzweigung von Kettenmolekülen. XXIII. Langkettenverzweigung in Polyolefinen-ein Vergleich der Ergebnisse aus 13C-NMR-spektroskopischen Messungen und Untersuchungen zur Molekülkontraktion in LösungXXII. Mitt.: Zeitschrift der Chemisch-Technologischen Hochschule Burgas (Bulgarien), im Druck (1983)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 34 (1983), S. 345-351 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The results obtained in investigating the long chain branching of high pressure polyethylene (LDPE) and emulsion polybutadiene (PB-E) are provided. Besides 13C NMR data measured in the low and high field region (with hydrated PB-E) comparative values of molecule contraction in solution are considered. The change of the molecular weight distribution and the relationships between molecular weight and intrinsic viscosity in dependence on conversion in the emulsion polymerization of butadiene was investigated. The data required for determining the contraction factor were obtained by combining gel permeation chromatography and solution viscosity measurements. The differences of the results are discussed with respect to their causes.
    Notes: Es wird über Ergebnisse von Langkettenverzweigungsanalysen am Hochdruckpolyethylen (PE-LD) und Emulsionspolybutadien (PB-E) berichtet. Die Ergebnisse aus der 13C-NMR-Spektroskopie im niederen und hohen Feldbereich (am hydrierten PB-E) werden mit Informationen aus den Untersuchungen zur Molekülkontraktion in Lösung verglichen. Die änderungen der Molmassenverteilung sowie die Zusammenhänge zwischen Molmasse und Grenzviskosität als Funktion des Umsatzes bei der Emulsionspolymerisation des Butadiens wurden untersucht. Die Daten zur Bestimmung des Kontraktionsfaktors g′GPC wurden aus der Kombination von Gelpermeationschromatographie und Viskositätsmessungen erhalten. Die Ursachen für die unterschiedlichen Resultate werden diskutiert.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1983.010340608
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  • 8
    Electronic Resource
    Electronic Resource
    Prozeßnahe Partikelanalyse (1992)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 64 (1992), S. 864-865 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.3306409143
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  • 9
    Electronic Resource
    Electronic Resource
    Zur Erfassung von scheinbaren Wärmeleitzahlen quer zur Strömungsrichtung in gasdurchströmten Schüttungen (1972)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 44 (1972), S. 1309-1312 
    Details
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Es werden Meßergebnisse der scheinbaren radialen Wärmeleitzahlen mitgeteilt. Ausgehend von differenziellen Wärmebilanzen werden mathematische Zusammenhänge entwickelt, aus denen in Zusammenhang mit den experimentellen Ergebnissen hervorgeht, daß die scheinbare Wärmeleitzahl in radialer Richtung einer gasdurchströmten Schüttung in erster Näherung eine Funktion der Massenstromdichten sowie der spezifischen Wärme des Gases darstellt. Die Wärmeleitzahlen wurden aus an einer Versuchsanlage mit 80 mm lichter Weite und ca. 1800 mm Länge gemessenen Temperatur-Quer- und Längs-Profilen errechnet. Die Versuche wurden für Wärmestrom-richtung von innen nach außen und umgekehrt durchgeführt und die Ergebnisse an einem Rohr mit kleinem Durchmesser überprüft.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330442306
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  • 10
    Electronic Resource
    Electronic Resource
    Chemische synthese von polysaccharides (1961)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 49 (1961), S. 238-240 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1961.020490116
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