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  • 1
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    Modelling of the electrical resistivity of ferromagnetic and paramagnetic intermetallic compounds (1992)
    Institute of Physics
    Details
    Publication Date: 1992-11-16
    Print ISSN: 0953-8984
    Electronic ISSN: 1361-648X
    Topics: Physics
    Published by Institute of Physics
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    PAPER CURRENT
  • 2
    Electronic Resource
    Electronic Resource
    The torsional Raman spectra of C2H6 and C2D6 (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 3327-3334 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The torsional Raman spectra of C2H6 and C2D6 have been experimentally investigated with an improved conventional Raman spectrometer. Wave numbers and absolute cross sections of all observed bands have been satisfactorily interpreted within the experimental accuracy by means of a simple, pure-torsional Hamiltonian and a model for the torsional dependence of the molecular polarizability. The effective threefold potential barrier parameters for C2H6 have been taken from the recent literature, whilst for C2D6 the values V3eff (C2D6)=990±2 cm−1 and V6eff (C2D6)=7.9±1 cm−1 were obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456908
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  • 3
    Electronic Resource
    Electronic Resource
    Gas phase Raman scattering cross sections of benzene and perdeuterated benzene (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 2909-2914 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Depolarization ratios and Raman scattering differential cross sections of the Raman active fundamental bands of gas phase C6H6 and C6D6 are reported. These quantities are first reduced to derivatives of the molecular polarizability with respect to symmetry coordinates, and then these derivatives are interpreted in terms of bond properties, proving that the bond polarizability concept is as useful for aromatic systems as for other smaller nonaromatic molecules.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455942
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  • 4
    Electronic Resource
    Electronic Resource
    The torsional Raman spectra of partially deuterated ethane molecules. I. One conformer derivatives: CH3CD3, CH3CH2D, CH3CHD2, CH2DCD3, and CHD2CD3 (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 7788-7800 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The torsional Raman spectra of one-conformer partially deuterated derivatives of ethane, CH3CD3, CH3CH2D, CH3CHD2, CH2DCD3, and CHD2CD3 have been experimentally investigated with an improved conventional Raman spectrometer. The recorded spectra have been interpreted with a rotational–torsional effective Hamiltonian and a simple model for the torsional dependence of the molecular polarizability. The effective threefold torsional potential parameters for CH3CD3 (V3=997.72 cm−1, V6=8.45 cm−1 ) have been taken from the recent literature, whilst the following parameters were obtained for the other derivatives: CH3CH2D, V3=1007 cm−1, V6=7.3 cm−1; CH3CHD2, V3=1003 cm−1, V6=8.5 cm−1; CH2DCD3, V3=993 cm−1, V6=8.2 cm−1; CHD2CD3, V3=995 cm−1, V6=6.7 cm−1. The estimated accuracy of these parameters is of the order of ±2 cm−1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.460165
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  • 5
    Electronic Resource
    Electronic Resource
    Special-point ordering in general crystal structures (1982)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 38 (1982), S. 214-221 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The classification of families of ordered structures, in terms of positions in reciprocal space where two or more symmetry elements of the pair potential intersect at a point, is extended to include general crystal structures. Only a relatively small number of space groups, 24 in all, are shown to be relevant to special-point ordering. The method is illustrated with the study of special-point families for a hexagonal crystal with two atoms per unit cell.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0567739482000485
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  • 6
    Electronic Resource
    Electronic Resource
    Erratum: The torsional Raman spectra of partially deuterated ethane molecules. I. One conformer derivatives: CH3CD3, CH3CH2D, CH3CHD2, CH2DCD3, and CHD2CD3 [J. Chem. Phys. 94, 7788 (1991)] (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 8677-8677 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.461844
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  • 7
    Electronic Resource
    Electronic Resource
    Harmonic force field and Raman scattering intensity parameters of n-butane (1991)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 95 (1991), S. 1124-1139 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100156a020
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  • 8
    Electronic Resource
    Electronic Resource
    Modulation of the bacterial response to spectral solar radiation by algae and limiting nutrients (2002)
    Oxford, UK : Blackwell Science Ltd
    Freshwater biology 47 (2002), S. 0 
    Details
    ISSN: 1365-2427
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SUMMARY 1. The response of bacterial production (measured as [3H]TdR incorporation rate) to spectral solar radiation was quantified experimentally in an oligotrophic high-mountain lake over 2 years. Bacterial responses were consistent: ultraviolet-B (UVB) was harmful, whereas ultraviolet-A (UVA) + photosynthetically active radiation (PAR) and PAR enhanced bacterial activity. Full sunlight exerted a net stimulatory effect on bacterial activity in mid-summer but a net inhibitory effect towards the end of the ice-free period.2. Experiments were undertaken to examine whether the bacterial response pattern depended on the presence of algae and/or was modulated by the availability of a limiting inorganic nutrient (phosphorus, P). In the absence of algae, [3H]TdR incorporation rates were significantly lower than when algae were present under all light treatments, and the consistent bacterial response was lost. This suggests that the bacterial response to spectral solar radiation depends on fresh-C released from algae, which determines the net stimulatory outcome of damage and repair in mid-summer.3. In the absence of algae, UVB radiation inhibited bacteria when they were strongly P-deficient (mean values of N : P ratio: 46.1), whereas it exerted no direct effect on bacterial activity when they were not P-limited.4. P-enrichment of lake water markedly altered the response of bacteria to spectral solar radiation at the end of ice-free period, when bacteria were strongly P-deficient. Phosphorus enrichment suppressed the inhibitory effect of full sunlight that was observed in October, both in whole lake water (i.e. including algae) and in the absence of algae. This indicates that the bacterial P-deficiency, measured as the cellular N : P ratio, was partly responsible for the net inhibitory effect of full sunlight, implying a high bacterial vulnerability to UVB.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2427.2002.00969.x
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  • 9
    Electronic Resource
    Electronic Resource
    The conformational problem studied through the torsional Raman spectra of CH2DCH2D, CHD2CHD2, and CH2DCHD2 (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 1575-1590 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The torsional Raman spectra of CH2DCH2D, CHD2CHD2, and CH2DCHD2, recorded with an improved conventional Raman spectrometer, are interpreted here in the frame of an exact rotational–torsional Hamiltonian. The kinetic and potential operators of this Hamiltonian are discussed in detail, showing that the term responsible for the existence of two distinguishable conformers is of kinetic nature. For CH2DCH2D and CHD2CHD2 it is shown how to separate the rotational and the torsional motions by means of an appropriate choice of the molecular axis system. The wave numbers and intensities of both torsional Raman spectra are satisfactorily reproduced within the limits of the experiment with the following effective potential parameters: CH2DCH2D, V3=1002 cm−1, V6=6.0 cm−1; CHD2CHD2, V3=995 cm−1, V6=7.3 cm−1. For CH2DCHD2, only partially tractable in the present approach, an approximate estimate of V3=995 cm−1 has been obtained. Besides the quantitative interpretation of the torsional spectra, a discussion of the main facts of the conformational problem in connection to the spectroscopic observation is presented. In particular, the induced conformational transitions described here may contribute to the understanding of the elementary photoisomerization processes in molecules of the type AX2Y–AX2Y.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.465326
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  • 10
    Electronic Resource
    Electronic Resource
    Vibrational–torsional coupling. High-resolution stimulated Raman spectrum of the ν3 band of ethane (12C2H6) (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 97 (1992), S. 7055-7063 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We report a stimulated Raman spectrum of the Q branch of the ν3 band of ethane recorded with a resolution of about 0.0055 cm−1 and an absolute wave-number accuracy of the order of 0.001 cm−1. This spectrum is analyzed in terms of a vibrational–torsional coupling Hamiltonian that allows for the calculation of the observed wave numbers within the experimental uncertainty. The following spectroscopic parameters (in cm−1) have been obtained: ν30=994.1108(10), B3A1s−B0=−0.006 165(3), B3E3d−B0=−0.006 170(2), B3E3s−B0 =−0.006 184(2), B3A3d−B0=−0.006 257(2), A3A1s−A0=−0.003 037(15), A3E3d−A0 =−0.003 040(12), A3E3s−A0=−0.003 054(12), and A3A3d−A0=−0.003 065(12). A strong dependence of the threefold torsional potential barrier with respect to the q3 normal mode, ∂V3/∂q3=−275.9±1.4 cm−1, is deduced from the present analysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.463531
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