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  • 11
    Electronic Resource
    Electronic Resource
    Photoabsorption cross section of XeF2 from 150 to 275 nm by forward-scattering electron energy-loss spectroscopy (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 62 (1987), S. 4940-4942 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Using the technique of high-incident-energy forward-scattering electron energy-loss spectroscopy, we have derived the relative photoabsorption cross section of xenon difluoride from 150 to 275 nm. Normalization of our data to two previous measurements which used conventional photoabsorption techniques shows good agreement with an early measurement over the entire spectral range, but significant disagreement with more recent data for wavelengths greater than 175 nm.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.339798
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  • 12
    Electronic Resource
    Electronic Resource
    An all solid-state magnetic pulse compressor with amorphous metals for pumping a repetition-rated KrF excimer laser (1990)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 1196-1199 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We have developed an all solid-state exciter consisting of a magnetic pulse compressor with a transfer energy of 10 J/pulse approximately for KrF discharge lasers. The magnetic pulse compressor was operated with an energy transfer efficiency of 65% at a repetition rate frequency of 40 pps. A KrF excimer laser excited by the all solid-state exciter was operated with an average laser power of 2.7 W. Four types of amorphous metals as a magnetic core material were experimentally compared in terms of their magnetic induction and magnetic loss so as to be used in the all solid-state exciter.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141211
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  • 13
    Electronic Resource
    Electronic Resource
    Observation of Rydberg transitions from the inner valence shell of ethane (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 87 (1987), S. 1499-1501 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The electron impact spectrum of ethane has been examined in a region that includes ionization out of the inner valence shell. One diffuse structure and a progression of ten vibrational bands have been found in a 4 eV range below and to some degree overlapping the 2A2u ion threshold. Evidence indicates that the observed transitions belong to the symmetry forbidden Rydberg series (2a2u)2→(2a2u, npσ or npπ).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.453259
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  • 14
    Electronic Resource
    Electronic Resource
    Temperature dependence of proton spin-lattice and spin-spin relaxation times in isotactic polypropylene. Effect of atactic fraction (1990)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 175 (1990), S. 29-38 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die Temperatur des T1-Minimums für die Segmentbewegung in Polypropylen, das einen hohen ataktischen Anteil besitzt, ist niedriger als die in isotaktischem Polypropylen. Ein kurzes T1, T1s, tritt bei beiden Materialien auf. Bei Temperaturerhöhung nimmt T2a (T2 der beweglichen amorphen Bezirke) stark und T2m (T2 der dazwischen liegenden Bezirke) leicht zu, während sich T2c (T2 der steifen kristallinen Bezirke) kaum ändert. T2a in Polypropylen mit hohem ataktischem Anteil ist länger als in isotaktischem Polypropylen.Der Massenbruch der kristallinen Bezirke, Fc, nimmt bei Temperaturerhöhung ab und der der amorphen Bezirke, Fa, zu. Die Relaxationsgeschwindigkeit, 1/ (T1min), steigt linear mit Zunahme des amorphen Anteils an, außer bei der mit siedendem n-Heptan extrahierten Probe. Mit Zunahme der Peaktemperatur von tan δ fällt T2a nahezu linear ab, während die Temperatur des T1-Minimums zunimmt.
    Notes: The temperature of the T1 minimum for the segmental motion in polypropylene containing a lot of atactic fraction is lower than that in isotactic polypropylene. A short T1, T1s, appears for both materials. As the temperature is raised, there is a large increase in T2a (T2 of the mobile amorphous regions), and a mild increase in T2m (T2 of the intermediate regions), while there is no substantial change in T2c (T2 of the rigid crystalline regions). T2a in polypropylene containing a lot of atactic fraction is longer than that in isotactic polypropylene.The mass fraction of crystalline regions, Fc, decreases and that of the amorphous regions, Fa, increases as the temperature is raised. There is a linear increase in the relaxation rate, 1/(T1min), as the amorphous fraction is increased, except for the sample extracted with boiling n-heptane. With increase of the peak temperature of tanδ, T2a decreases nearly linearly, while the temperature of the T1 minimum increases.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1990.051750103
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  • 15
    Electronic Resource
    Electronic Resource
    Notiz über eine neue Reaktion von Phenylisocyanat mit tertiären aromatischen Aldehyden (1966)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 99 (1966), S. 3932-3933 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19660991228
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  • 16
    Electronic Resource
    Electronic Resource
    Notiz über die Darstellung von Tri-α-furyl-phosphin (1966)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 99 (1966), S. 712-713 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19660990247
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  • 17
    Electronic Resource
    Electronic Resource
    Furan-thiol-(2) und Furan-selenol-(2) (1966)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 99 (1966), S. 3215-3217 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Ausgehend von α-Furyllithium werden Derivate des Furan-thiols-(2) (8) und -selenols-(2) (9) dargestellt. Freies 8 und 9 sind nur in alkalisch-wäßrigem Medium stabil.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19660991020
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  • 18
    Electronic Resource
    Electronic Resource
    Cross polarization between 1H and 13C nuclei in isotactic poly(propylene). Effects of crystallinity and crystallographic form (1993)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 194 (1993), S. 2279-2286 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: 13C spectra of monoclinic (α), hexagonal (β) and smectic isotactic poly(propylene) (PP) with different degrees of crystallinity were obtained by the cross polarization/magic angle spinning (CP/MAS) method. In order to estimate the effects of cross polarization, an accurately weighed poly(oxymethylene) (POM) rod was packed into a rotor together with the sample and the ratio of the peak area of PP to that of POM was measured precisely. Taking the crystallinity into consideration, the cross polarization seems to occur rather effectively in smectic PP. This result indicates that there are constrained chains in the amorphous regions of the smectic PP, which contribute effectively to the cross polarization. The ratio of the peak are of α-and β-PP is nearly equal, indicating that the cross polarization occurs mainly in the crystalline regions in both samples and not in the amorphous regions. The 1 H spin-lattice relaxation time in the rotating frame decreases with decreasing crystallinity, indicating the presence of imperfect crystallites in the smectic PP.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1993.021940812
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  • 19
    Electronic Resource
    Electronic Resource
    Studies on biaxial stretching of polypropylene film. IV. Overall orientation during one-step biaxial stretching and its application to the estimation of the principal refractive indices of isotactic polypropylene (1970)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-2: Polymer Physics 8 (1970), S. 1565-1574 
    Details
    ISSN: 0449-2978
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Polypropylene film was biaxially stretched in one step in air at 140°C or 152°C, and the deformation was studied optically. A linear relation held between Δnss and vA-½ for vA 〉 10, at both temperatures, where Δnss is the birefringence with respect to the normal to the film and vA is the degree of stretching expressed as the factor by which the area of the film is increased. Extrapolation of data in this linear region yielded a value of 20 × 10-3 for -Δnss at infinite vA. Since it is presumed that the polypropylene molecules lie completely parallel to the film surface when the film is stretched infinitely, -Δnss at vA-½ = 0 must be just half Δn°, the intrinsic birefringence in the case of completely parallel orientation. Thus, Δn° must be 40 × 10-3. This value was obtained experimentally in uniaxial stretching when the birefringence with respect to the direction of drawing was extrapolated to infinite extension. Similar relations held between np, the average of the refractive indices in the two stretching directions, and vA, and between nss, the index normal to the film, and vA. By similar extrapolations, (1/2)(n′γ + n′β) and n′β = n*α′ were estimated, and thence nα′ was obtained. Here, n′α and n′β are the refractive indices along the c axis (molecular chain axis) and b axis. All these optical parameters refer to a density of 0.900 g/cm3. Hence by applying a density correction to those values, the principal refractive indices and the intrinsic birefringence of polypropylene crystal were evaluated as follows: nα = 1.5522, nβ = n*α = 1.5106 and Δnc° = 4.16 × 10-3, where n*α is the refractive index prependicular to the b and c axes of the crystal.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1970.160080910
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  • 20
    Electronic Resource
    Electronic Resource
    Organic solvent treatment of isotactic polypropylene films, 2Part 1 cf. Angew. Makromol. Chem. 113 (1983) 31.. Temperature dependence of proton spin-lattice and spin-spin relaxation times of the sample treated with tetrachloroethylene (1988)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 161 (1988), S. 97-111 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die Stuktu von bei hoher Temperatur mit Tetrachlorethylen behandelten Filmen aus isotaktischem Polypropylen wurde durch die Bestimmung von Protonen-Spin-Gitter- (T1) und Spin-Spin-Relaxationszeiten (T2), Gewichsverlust, Kristallinität, Molmasse, Schmelztemperatur und Schmelzwärme charakterisiert. Zwei Arten von Proben, eine abgeschreck, eine getempert, wurden verwendet. Durch die Lösungsmittelbehandlung bei hoher Temperatur trat insbesondere bei der abgeschreckten Probe ein erheblicher Gewichtsverlust und ein Anstieg des Molekulargewichts und der Kristallinität auf. Diese morphologischen Veränderungen führten zu einer Verschiebung des T1-Minimums zu höheren Temperaturen und zu einer Abnahme von T2a. Die Wirkungen des Lösungsmittels auf die getemperte Probe waren qualitativ gleichartig, aber relativ schwach.
    Notes: The structural properties of isotactic polypropylene films treated with tetrachloroethylene at high temperatures were characterized by proton spin-lattice T1 and spin-spin T2 relaxation times, loss in weight, crystallinity, molecular weight, and melting temperature, and heat of fusion. Two kinds of samples, a quenched and an annealed sample, were employed. There are a considerable loss in weight and large increases in crystallinity and in molecular weight when treated the sample at high temperatures especially in the quenched one. These morphological changes result in a shift of T1 minimum to high temperatures and a decrease in T2a. The effects of the solvent on the annealed sample are qualitatively the same for the quenched one but are relatively mild.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1988.051610110
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