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  • 1
    Electronic Resource
    Electronic Resource
    The O(1D) yield from O2 photodissociation near H Lyman-α (121.6 nm) (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 110 (1999), S. 1949-1958 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The solar H Lyman-α line is, through O2 photodissociation, an important source of O(1D) production throughout the mesosphere and lower thermosphere. To ascertain the energy balance in this altitude region, it is necessary to know the O(1D) yield across the solar H Lyman-α feature, since H Lyman-α absorption by O2 at ∼80 km accounts for a substantial fraction of the solar radiation absorbed in the mesosphere. An earlier laboratory study had provided a value of 0.44±0.05 for the O(1D) yield at the center of the solar H Lyman-α line, where the profile shows a minimum in intensity due to strong self-reversal of the line. Using tunable laser radiation, we have determined the O(1D) yield from O2 photodissociation across the entire H Lyman-α profile from 121.2 to 121.9 nm, at a spectral resolution of 0.0015 nm (1 cm−1). The results reveal a strongly wavelength-dependent window in the O(1D) yield, the origins of which are explained using calculations based on a coupled-channel Schrödinger-equations model of the O2 photodissociation. The calculations, which show significant isotopic dependence near H Lyman-α, predict that the depth of the quantum-yield window will increase significantly as the temperature is lowered. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.477852
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  • 2
    Electronic Resource
    Electronic Resource
    Photoelectron distributions from femtosecond pump/probe excitation with chirped probe pulses (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 108 (1998), S. 7631-7636 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We calculate photoelectron distributions obtained from the two-photon pump/probe ionization of Na2. A first ultrashort pulse prepares a vibrational wave packet in the (2)1∑u+ electronic state. The dynamics is probed by time-delayed ionization caused by a chirped femtosecond laser pulse. Time-resolved photoelectron spectra are determined for different chirp parameters. It is shown that the spectra are very sensitive to the choice of the chirp. In particular the width can be selectively modified and the in- or outward motion of the wave packet can be distinguished by using an appropriately chirped electric field. An analytical expression for the photoelectron spectrum explains its dependence on the chirp parameter. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.476198
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  • 3
    Electronic Resource
    Electronic Resource
    Heterogeneity of leaf CO2 assimilation during photosynthetic induction (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 19 (1996), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Spatial mid temporal variations in the distribution of photosynthesis over the leaf area were investigated during induction upon illumination of Rosa rubiginosa L. leaves. Gas exchange and maps of relative photosynthetie electron transport activity computed from chlorophyll fluorescence images were simultaneously monitored. In air, after 15 h of dark adaptation, linear electron transport was heterogeneously distributed over the leaf area during the induction. This patchy induction was explained by asynchronous metabolism activation for the first 10 min of illumination, concomitant asynchronous limitation by intrinsic metabolism and stomatal apertures (10–30 min) and finally by only stomatal limitation beyond 30 min. A brief transition to non-photorespiratory conditions after 20 min of illumination under subsaturating irradiance revealed a marked heterogeneity of CO2 assimilation, presumably as a result of heterogeneous stomatal apertures. The frequency distribution of CO2 assimilation was unimodal. During the induction, heterogeneity gradually decreased and photosynthesis was uniform at steady-state. After 10 min of dark adaptation, heterogeneity of linear electron transport activity occurred during the first 15 min of a second induction and mainly resulted from metabolic limitation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3040.1996.tb00013.x
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  • 4
    Electronic Resource
    Electronic Resource
    Heavy Metals and Acid-Volatile Sulfides in Sediments of the Tijuana Estuary (1997)
    Springer
    Bulletin of environmental contamination and toxicology 59 (1997), S. 113-119 
    Details
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001289900452
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  • 5
    Electronic Resource
    Electronic Resource
    The roughening transition of the three-dimensional Ising interface: A Monte Carlo study (1996)
    Springer
    Journal of statistical physics 85 (1996), S. 383-401 
    Details
    ISSN: 1572-9613
    Keywords: Ising model ; roughening transition ; Monte Carlo ; finite-size scaling ; renormalization group
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We study the roughening transition of an interface in an Ising system on a 3D simple cubic lattice using a finite-size scaling method. The particular method has recently been proposed and successfully tested for various solid-on-solid models. The basic idea is the matching of the renormalization-groupflow of the interface with that of the exactly solvable body-centered cubic solid-on-solid model. We unambiguously confirm the Kosterlitz-Thouless nature of the roughening transition of the Ising interface. Our result for the inverse transition temperatureK r=0.40754(5) is almost two orders of magnitude more accurate than the estimate of Mon, Landau, and Stauffer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02174211
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  • 6
    Electronic Resource
    Electronic Resource
    Zur Kenntnis von Ba6Pr2Fe4O15, Ba5SrPr2Fe4O15 und Ba5CaPr2Fe4O15 (1997)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 623 (1997), S. 200-204 
    Details
    ISSN: 0044-2313
    Keywords: Alkaline Earth ; Praseodym ; Iron Oxide ; Crystal Structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On Ba6Pr2Fe4O15, Ba5SrPr2Fe4O15 and Ba5CaPr2Fe4O15Ba6Pr2Fe4O15 (I), Ba5SrPr2Fe4O15 (II), and Ba5CaPr2Fe4O15 (III) have been prepared by high temperature CO2-LASER techniques. (I)-(III) crystallize isotypic to the Ba6Ln2Al4O15 type, space group C6v4-P63mc, (I): a = 11.808(2), c = 6.894(5), Z = 2. Typical features of the crystal structure are face shared MO6 octahedra (M = Ba or Ba/Sr, Ba/Ca) and a statistical distribution of Ba and Pr in a ratio of 1 : 2 within double capped trigonal prisms of oxygen. Fe shows tetrahedral as well as octahedral coordination by oxygen. Calculation of coulomb terms of lattice energy indicate the stabilization of Pr3+ beside Fe3+ by the Ba6Ln2Al4O15 type.
    Notes: Ba6Pr2Fe4O15 (I), Ba5SrPr2Fe4O15 (II) und Ba5CaPr2Fe4O15 (III) wurden mit Hochtemperatur-CO2-LASER-Technik dargestellt. (I)-(III) kristallisieren mit hexagonaler Symmetrie, Raumgruppe C6V4-P63mc, (I): a = 11.808(2), c = 7,036(4) Å; (II): a = 11.689(2), c = 6.954(2) Å; (III): a = 11.602(6), c = 6.894(5) Å, Z = 2. Charakteristische Eigenschaften dieser Kristallstruktur sind flächenverknüpfte MO6-Oktaeder (M = Ba oder Ba/Sr, Ba/Ca) und eine statistische Verteilung von Ba und Pr im Verhältnis 1 : 2 in einem zweifach überkappten trigonalen Sauerstoffprisma. Fe zeigt sowohl tetraedrische als auch oktaedrische Sauerstoffkoordination. Berechnungen der Coulomb-Terme zur Gitterenergie deuten an, daß durch den Ba6Ln2A4O15-Typ Pr3+ neben Fe3+ stabilisiert wird.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19976230133
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  • 7
    Electronic Resource
    Electronic Resource
    Determination of inorganic ionic mercury down to 5×10−14 mol l−1 by differential-pulse anodic stripping voltammetry (1996)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 356 (1996), S. 247-252 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A new method is described for the reliable and ultrasensitive determination of inorganic ionic mercury, using differential-pulse anodic stripping voltammetry on a glassy carbon electrode. It has been possible to determine mercury down to a concentration of 5×10−14 mol l-1 (the lowest detection limit ever reported for a voltammetric method). This success was achieved by using a thiocyanate electrolyte and relatively long deposition times. The mercury ions are stabilized in the solution by the formation of strong thiocyanate complexes. This leads to a highly reproducible cathodic plating and anodic dissolution of mercury. A speciation analysis allowing to distinguish between dissolved atomic and ionic mercury in water is possible.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s0021663560247
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  • 8
    Electronic Resource
    Electronic Resource
    Cu4O12-Baugruppen aus planaren CuO4-Polygonen im Barium-Vanadyl-Oxocuprat(II)-phosphat Ba(VO)Cu4(PO4)4Professor Rudolf Hoppe zum 75. Geburtstag gewidmet (1997)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 623 (1997), S. 1693-1698 
    Details
    ISSN: 0044-2313
    Keywords: Barium ; Copper ; Vanadyl Phosphate ; Crystal Structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Cu4O12 Groups Built of Square Planar CuO4 Polygones in the Barium Vanadyl Oxocuprate(II) Phosphate Ba(VO)Cu4(PO4)4Single crystals of Ba(VO)Cu4(PO4)4 have been prepared by solid state reactions just below the melting points of the reaction mixtures of BaP2O6, Cu3(PO4)2, CuO, V2O5 and V2O3 in evacuated closed quartz glas tubes. The compound crystallizes with tetragonal symmetry, Space group D42—P4212, a = 9.560(2), c = 7.160(2) Å, Z = 2. Special and new features of the crystal structure are to each other isolated Cu4O12 and (VO)(PO4)4 groups. The crystal chemistry of the Cu4O12 groups is discussed with respect to other compounds containing out of plane connected square planar MO4 polygones.
    Notes: Einkristalle von Ba(VO)Cu4(PO4)4 wurden mit Festkörperreaktionen dicht unterhalb des Schmelzpunktes des Reaktionsgemenges aus BaP2O6, Cu3(PO4)2, CuO, V2O5 und V2O3 in geschlossenen, evakuierten Quarzglasampullen dargestellt. Diese Verbindung kristallisiert tetragonal, Raumgruppe D42—P4212, mit a = 9,560(2), c = 7,160(2) Å, Z = 2. Besondere und neue Eigenschaften der Kristallstruktur sind zueinander isolierte Cu4O12- und (VO)(PO4)4-Gruppen. Die Kristallchemie der Cu4O12-Baugruppen wird mit Blick auf andere Verbindungen, die nicht in Ebenen verknüpfte MO4-Polygone aufweisen, diskutiert.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19976231103
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  • 9
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    Microscopic Universality in the Spectrum of the Lattice Dirac Operator (1998)
    American Physical Society
    Details
    Publication Date: 1998-02-09
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
    Published by American Physical Society
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  • 10
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    Photoelectron distributions from femtosecond pump/probe excitation with chirped probe pulses (1998)
    American Institute of Physics
    Details
    Publication Date: 1998-05-08
    Print ISSN: 0021-9606
    Electronic ISSN: 1089-7690
    Topics: Chemistry and Pharmacology , Physics
    Published by American Institute of Physics
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