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  • 1
    Electronic Resource
    Electronic Resource
    Synchrotron radiation selected s-tetrazine ion chemistry (1988)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 110 (1988), S. 1093-1098 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00212a016
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of tidal currents, seston, and bottom sediments on growth of Mercenaria mercenaria: results of a field experiment (1989)
    Springer
    Marine biology 102 (1989), S. 85-93 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Tidal currents, seston, and sediments separately influence growth of the hard clam, Mercenaria mercenaria, but it is uncertain how these factors may interact. A 3×3 factorial field experiment, carried out in Great Sound, a coastal lagoon in Southern New Jersey, USA, between May and September 1986, determined the relative effects of three sediment types and three site-specific seston/tidal current regimes on the individual growth of M. mercenaria. Analysis of variance of the change in shell length after 15 wk (differences in initial and final lengths) demonstrated a significant difference (P=0.0064) in growth among sites, but no significant differences (P=0.1331) for growth in different sediments, although trends were evident. Effects of sites were independent of sediment type (P=0.2621). Shell growth rates differed by 10.7% between the slowest and fastest sites, but only differed by 5.7% between sediment types, with fastest growth in sand and slowest in mud. Tidal current speeds and four measures of seston (chlorophyll a, particulate inorganic and organic matter, PIM and POM, and energy content) were measured 〉20 times in near-bottom waters at each site. Horizontal fluxes of POM exhibited higher correlation coefficients with growth rates, than did seston concentrations or current speeds alone. We attribute significant “site” differences to differences in horizontal seston fluxes fluxes among sites. We suggest that horizontal seston fluxes may be a major factor affecting individual growth of suspension-feeding bivalves.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00391326
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  • 3
    Electronic Resource
    Electronic Resource
    Relaxation processes following excitation and ionization of SiF4 in the vicinity of the silicon 2p threshold. I. Electronic relaxation processes (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 7071-7077 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The photoelectron and Auger spectra of SiF4 have been measured, using synchrotron radiation in the 100 to 125 eV photon energy range in the vicinity of the Si2p ionization threshold. Partial photoionization cross sections have been obtained for outer, inner valence states and satellite states in the same energy range, together with the threshold photoelectron spectrum. At the energies of the discrete resonances observed below 112 eV, the core excited molecule is found to decay mostly by resonant Auger and to a small extent by autoionization. Among the resonant Auger pathways, those in which two electrons (rather than one) are ejected are found to play a dominant role. Above threshold, especially around the energy of the first continuum resonance, normal Auger processes are observed. Also, we offer a new interpretation of the Auger spectrum based on large configuration interaction in the final state and on the screening of the Si2p hole by the lone-pair electrons of the fluorine atoms. We also find some evidence of cascade Auger processes which explain the formation of triply ionized molecules.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456235
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  • 4
    Electronic Resource
    Electronic Resource
    Satellites and double ionization continua in the CS2 photoelectron spectrum (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 87 (1987), S. 2536-2548 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The CS+2 valence satellites have been studied with photoelectron spectroscopy using synchrotron radiation in the 35–75 eV photon energy range. Partial cross sections (σ) and asymmetry parameters (β) for most bands have been measured as a function of photon energy. Below 28 eV binding energy, the symmetry of satellite bands has been identified on the basis of their β value and a comparison between experimental photoelectron spectra and new ab initio SCF-CI calculations of CS+2 corrected for transition moments. For the bands with binding energies above 28 eV no configuration interactions states of CS+2 are predicted with significant intensity. We suggest that they originate from the opening of direct double ionization continua. This is supported by the similarity of their cross sections with the total double ionization one.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.453093
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  • 5
    Electronic Resource
    Electronic Resource
    Relaxation processes following excitation and ionization of SiF4 in the vicinity of the silicon 2p threshold. II. Dissociation of the molecular ions (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 7078-7086 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Partial ion yields from photoionization of SiF4 have been measured with time-of-flight mass spectrometry, photoion–photoion coincidence and triple photoion coincidence techniques using synchrotron radiation from 100 to 136 eV, in the region of the silicon 2p edge where strong resonances are found. From the photon energy dependence of positive ion pairs and of doubly charged fragment intensities, with a suitable normalization procedure, we have estimated the total double photoionization cross section. Below the Si2p edge, the double to single dissociative ionization branching ratio follows the resonance behavior, and is consistent with the photoelectron results of de Souza et al. (Paper I) and discussed in terms of multibond breaking dissociation pathways of residual excited ions (singly and doubly charged) produced by resonant Auger decay processes. Above the Si2p edge, the fragmentation is found to originate from dissociative double ionization occurring after normal Auger processes. The small additional contribution of triple dissociative ionization is consistent with a second order Auger process. In contrast, the underlying valence ionization continuum is responsible for all parent intensity and most of the SiF+3 fragment expected from the normal dissociative ionization channels. The measurement of appearance energies of fragment ion pairs by the photoion–photoion coincidence method, offers a direct measurement of the first direct double ionization onset in SiF4 and new values for other dissociative SiF2+4 states which complement those found by Auger spectroscopy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456236
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  • 6
    Electronic Resource
    Electronic Resource
    Angle resolved photoelectron study of resonances near the Si 2p edge of the Si(CH3)4 molecule (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 83 (1985), S. 492-498 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Photoelectron spectra of tetramethylsilane, were measured at selected photon energies in the vicinity of the Si 2p edge, using synchrotron radiation. In addition to known valence and core Si 2p bands, three LVV Auger lines (69, 76, and 80 eV electron energy) were observed for the first time. Partial and differential cross sections for the Si 2p band and two of the Auger lines have been measured at several photon energies from the Si 2p onset up to 135 eV. An intense resonance is evident in the Si 2p continuum as well as in the LVV Auger decay channels. Its position, right above threshold, accounts for only a part of the absorption feature. Another maximum, already seen in absorption around 124 eV, may be a shape resonance associated with the Si 2p continuum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.449511
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  • 7
    Electronic Resource
    Electronic Resource
    Nuclear motion driven by the Renner–Teller effect as observed in the resonant Auger decay to the X˜2Π electronic ground state of N2O+ (2001)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 115 (2001), S. 864-869 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: High-resolution Auger spectroscopy applied under resonant Auger Raman conditions is shown to be a powerful tool for characterizing complex potential energy surfaces in core-excited systems. Using the example of Nt 1s−1π*→X˜2Π resonant Auger transition in nitrous oxide we emphasize the interplay between the nuclear motion and the electronic decay. We show how the choice of excitation energy allows selection of core-excited species of different geometries. The nuclear dynamics of these species are mapped by measuring the resonant Auger decay spectra. In addition to the changes in vibrational structure observed for the resonant Auger decay spectra, a strong influence of nuclear motion on the electronic decay is revealed, inducing the so-called "dynamical Auger emission." The experimental results are supported by ab initio quantum chemical calculations restricted to a linear geometry of the core-excited state. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1377890
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  • 8
    Electronic Resource
    Electronic Resource
    A new paramagnetic analogue of cholesterol as a tool for studying molecular interactions of genuine cholesterol
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/Biomembranes 900 (1987), S. 239-248 
    Details
    ISSN: 0005-2736
    Keywords: Amphotericin ; Cholesterol analog ; ESR ; Filipin ; Fluorescence ; Molecular interaction
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0005-2736(87)90338-5
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  • 9
    Electronic Resource
    Electronic Resource
    Interactions between a paramagnetic analogue of cholesterol and filipin
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/Biomembranes 939 (1988), S. 102-110 
    Details
    ISSN: 0005-2736
    Keywords: Cholesterol analog ; ESR ; Electron microscopy ; Filipin
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0005-2736(88)90051-X
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  • 10
    Electronic Resource
    Electronic Resource
    Evidence for bidirectional transverse diffusion of spin-labeled phospholipids in the plasma membrane of guinea pig blood cells
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/Biomembranes 946 (1988), S. 315-327 
    Details
    ISSN: 0005-2736
    Keywords: (Guinea pig) ; ESR ; Phospholipid ; Spin label ; Transverse diffusion
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0005-2736(88)90407-5
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