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  • 2000-2004  (56)
  • 1995-1999  (57)
  • 1955-1959  (10)
  • 1930-1934  (7)
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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
    THE EFFECT OF Ph UPON THE PRECIPITATION OF ZINC AMMONIUM PHOSPHATE (1930)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 52 (1930), S. 120-124 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja01364a019
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  • 3
    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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  • 4
    Electronic Resource
    Electronic Resource
    The use of chlorophyll fluorescence excitation spectra for the non-destructive in situ assessment of UV-absorbing compounds in leaves (2002)
    Oxford, UK : Blackwell Science Ltd
    Plant, cell & environment 25 (2002), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: In this study a method was designed to assess non-destructively the type of UV-screening compounds present in the leaf epidermis. The method is based on the recording and calculation of the ratio of UV-excitation spectra of chlorophyll fluorescence (FER) from the adaxial and abaxial sides of bifacial leaves, or from older and younger segments of monocotyledonous leaves. The logarithm of this ratio (logFER) matched the absorption spectrum of the UV-absorbers present in the leaf, as confirmed by its overlap with the absorption spectrum of the methanolic extract of the leaf or of the isolated epidermis. By using the logFER approach, it was possible to demonstrate that the concentration but not the classes of compounds present in the epidermis that are responsible for UV-screening is affected by the side and the age of the leaves. In contrast, measurements from the leaves of seven dicots and one monocot indicated large difference in the classes of these compounds between species. Finally, it was shown that the logFER in the UV is independent of the emission wavelength, and that the method can be used for quantitative measurements. This method expands to the spectral domain the use of ChlF for the estimation of the leaf epidermal transmittance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-3040.2002.00942.x
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  • 5
    Electronic Resource
    Electronic Resource
    Inhibition of photosynthesis by Colletotrichum lindemuthianum in bean leaves determined by chlorophyll fluorescence imaging (2001)
    Oxford, UK : Blackwell Science, Ltd
    Plant, cell & environment 24 (2001), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Infection of bean leaves by Colletotrichum lundemuthianum causes vein necrosis and subsequent localized wilting of the blade. The effect of infection on photosynthesis was investigated by imaging leaf chlorophyll fluorescence as a means of mapping stomatal and metabolic inhibition of photosynthesis. During infection, CO2 assimilation (An), stomatal conductance to water vapour, and photosynthetic electron transport rate (Jt) decreased, whereas dark respiration increased. An decreased more than was expected from the reduction in green leaf area, showing that photosynthesis was inhibited in apparently healthy areas. Under subsaturating irradiance, images of Jt in air showed that photosynthesis decreased gradually, with this effect shifting from green to necrotic areas. Sudden increase in CO2 concentration to 0·74% in the atmosphere around the leaf only partially reversed this inhibition, showing that both stomatal and metabolic inhibition occurred. Under limiting irradiance, decreases in Jt and in maximal Jt during high CO2 exposure as leaf damage severity increased suggested that metabolic inhibition was mediated through an inhibition of Ribulose 1·5-bisphosphate (RuBP) regeneration. Finally, the importance of our data in terms of assessing the loss of photosynthetic yield from visible symptoms – as is currently performed in epidemiology – is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.0016-8025.2001.00737.x
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  • 6
    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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  • 7
    Electronic Resource
    Electronic Resource
    Non-perturbative wave-packet calculations of time-resolved four-wave-mixing signals (2000)
    Springer
    Applied physics 71 (2000), S. 293-297 
    Details
    ISSN: 1432-0649
    Keywords: PACS: 42.65.Dr; 42.65.Re; 33.80.Wz
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. We extend a method proposed by Seidner et al. [J. Chem. Phys. 103, 3998 (1995)] to extract directional terms from a time-dependent molecular polarization to obtain time-resolved four-wave-mixing (FWM) signals. Instead of employing perturbation theory, the total polarization induced in the molecular sample by the interaction with several femtosecond laser pulses is determined by solving the time-dependent Schrödinger equation for the nuclear dynamics in coupled electronic states numerically exact. Repeating the calculation for several combinations of relative phases of the involved fields leads to a linear system of equations for the contributions emitted in different directions. Gas-phase I2 molecules serve as a numerical example.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003400000342
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  • 8
    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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  • 9
    Electronic Resource
    Electronic Resource
    High-order harmonic generation in absorbing, dispersive, and ionizing media (2000)
    Springer
    Applied physics 70 (2000), S. S221 
    Details
    ISSN: 1432-0649
    Keywords: PACS: 42.65.Ky; 32.80.Wr; 42.65.Re
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. Experimental and theoretical investigations of high-order harmonic generation in absorbing, dispersive, and ionizing media are reported. All factors limiting the high-order harmonic generation efficiency are taken into account. Good agreement between calculations and experimental results is obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003400000365
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  • 10
    Electronic Resource
    Electronic Resource
    Die Analyse von Oxydeinschlüssen in Stahl im Mikrogrammbereich (1958)
    Springer
    Microchimica acta 46 (1958), S. 744-755 
    Details
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary An analytical procedure is described for the microanalysis of oxide inclusions in steel. The following are determined in succession in a 200 to 400μg sample: silica by fuming with hydrofluoric acid by difference in weight; after decomposition and solution of the sample the iron is separated by extraction with diethyl ether and determined photometrically witho-phenanthroline; then aluminium is extracted with 8-hydroxyquinoline/chloroform and determined photometrically as oxinate, and finally the manganese is extracted with sodium diethyldithiocarbamate/chloroform and determined photometrically as carbamate. Four samples can be completed by one analyst in 6 to 8 hours. The time required can be shortened even more by providing suitable apparatus. The relative error of the analytical procedure averages ± 5 to 10%.
    Abstract: Résumé Description d'un processus analytique permettant la microanalyse d'inclusions d'oxydes dans l'acier. Sur une prise d'essai de 200 à 400μg, on effectue la série de déterminations suivantes: la silice, par calcination en présence d'acide fluorhydrique, par diminution de poids; après attaque et dissolution de la prise d'essai le fer est séparé par extraction par l'éther diéthylique et dosé par photométrie à l'aide de l'o-phénanthroline; l'aluminium est extrait par le système 8-hydroxyquinoléine-chloroforme et dosé par photométrie sous forme d'oxinate; finalement, le manganèse extrait par le système diéthyldithiocarbamate de sodium-chloroforme est dosé par photométrie sous forme de carbamate. L'analyse de quatre prises d'essai distinctes peut être effectuée par un analyste dans un temps de 6 à 8 heures. La durée d'analyse peut être encore diminuée par la mise en oeuvre d'un appareillage approprié. L'erreur relative de la méthode d'analyse s'élève en moyenne à ± 5 à 10%.
    Notes: Zusammenfassung Es wird ein Analysengang zur Mikroanalyse von Oxydeinschlüssen in Stahl beschrieben. Aus einer Einwaage von 200 bis 400μg werden der Reihe nach bestimmt: Kieselsäure durch Abrauchen mit Flußsäure aus der Gewichtsdifferenz; nach dem Aufschluß und Lösen der Probe wird das Eisen durch Extraktion mit Diäthyläther abgetrennt und photometrisch mit o-Phenanthrolin bestimmt; anschließend wird Aluminium mit 8-Hydroxychinolin/Chloroform extrahiert und photometrisch als Oxinat bestimmt und schließlich mit Natriumdiäthyldithiocarbamat/Chloroform das Mangan extrahiert und photometrisch als Carbamat bestimmt. Die Analyse von vier Einzelproben kann von einem Analytiker in 6 bis 8 Stunden durchgeführt werden. Die Analysendauer läßt sich durch eine entsprechende apparative Einrichtung noch verkürzen. Der relative Fehler des Analysenverfahrens beträgt im Mittel ± 5 bis 10%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01216645
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