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  • 1
    Electronic Resource
    Electronic Resource
    The stability of the copper-iron sulphides (1967)
    Springer
    Mineralium deposita 2 (1967), S. 250-250 
    Details
    ISSN: 1432-1866
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00201922
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  • 2
    Electronic Resource
    Electronic Resource
    Photochemistry of adsorbed molecules. III. Photodissociation and photodesorption of CH3Br adsorbed on LiF(001) (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 1475-1497 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Submonolayers of CH3Br physisorbed on a LiF(001) surface were irradiated by pulsed ultraviolet (UV) in ultrahigh vacuum in a study of surface aligned photochemistry (SAP). Translational energy and angular distributions were obtained for both photofragments and photodesorbed molecules by angularly resolved time of flight to a mass spectrometer. Single-photon adsorbate photolysis (PDIS) led to photofragment distributions, CH3 and Br, which differed from gas-phase photolysis. Photodesorption (PDES) of CH3Br was nonthermal and arose from UV absorption by the LiF crystal. The dynamics for these photoprocesses were found to vary in an informative way with the coverage and the phase of the adsorbed layer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455148
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  • 3
    Electronic Resource
    Electronic Resource
    Photochemistry of adsorbed molecules. IV. Photodissociation, photoreaction, photoejection, and photodesorption of H2S on LiF(001) (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 1498-1523 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The UV surface-aligned photochemistry (SAP) of submonolayers of H2S physisorbed on LiF(001) has been examined. Translational energy and angular distributions for photodissociation products and for H2S molecules leaving the surface after pulsed laser irradiation at 193 and 222 nm were measured by angularly resolved TOF to a quadrupole mass spectrometer. Single photon surface-aligned photodissociation (PDIS) of adsorbed H2S produced H with structured translational energy distributions P(ET) indicative of vibrational excitation within the complementary SH fragments. The SH vibrational distribution was bimodal and varied markedly with H2S coverage. Photoreaction (PRXN) within the adsorbate layer occurred as the H2S coverage increased beyond ∼0.1 monolayer. Molecular hydrogen was produced by PRXN of H with adjacent H2S(ad) molecules. The product H2 translational energy distribution showed evidence of both direct and indirect PRXN dynamics. At coverages greater than one monolayer, photoejection (PEJ) of H2S molecules with translational energies up to several eV was observed; PEJ was thought to be due to interadsorbate quenching of electronically excited H2S. At all the coverages examined, absorption of UV by the LiF substrate was found to photodesorb (PDES) H2S molecules with low translational energies (0–0.5 eV). The PDES was ascribed to an acoustic wave produced by laser excitation of color centers in the LiF, which were seen to fluoresce.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455716
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  • 4
    Electronic Resource
    Electronic Resource
    Surface-enhanced photodissociation: UV photolysis of OCS on LiF(001) (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 4092-4093 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.453811
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  • 5
    Electronic Resource
    Electronic Resource
    Photochemistry of adsorbed molecules. V. Ultraviolet photodissociation of OCS on LiF(001) (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 3645-3658 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Dynamical studies of the UV photochemistry of submonolayer coverages of OCS physisorbed on 116 K LiF(001) are presented. Following pulsed ultraviolet laser irradiation (λ 222 nm), translational energy and angular distributions were obtained for photolysis products by angle-resolved time-of-flight mass spectrometry. Photolysis of adsorbates gave rise to distributions which differed markedly from gas phase photodissociation. Energetic sulphur and CO fragments were detected for coverages ≥10−5 monolayers. The cross section for photolysis in the adsorbed state was enhanced 103–104× relative to the gas phase. The dynamics for these photoprocesses were found to vary with adsorbate coverage, indicative of a catalytic influence of the surface on the photochemistry.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458795
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  • 6
    Electronic Resource
    Electronic Resource
    Photochemistry of adsorbed molecules. VI. Ultraviolet photoreaction of OCS on LiF(001) (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 3659-3672 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The surface-aligned photoreaction (PRXN) of OCS physisorbed on LiF(001) was investigated at 222 nm. Ultraviolet PRXN within the adsorbate was detected over a wide range of coverages. Diatomic sulphur was produced by reaction of photolytically generated sulphur atoms with a coadsorbed OCS molecule: S*, S+OCS(ad)→S*2, S2(g)+CO(ad/g). Translational energy and angular distributions of the S2 reaction product were obtained by angle-resolved time-of-flight mass spectrometry. The dynamics of PRXN were found to vary with adsorbate coverage. At low coverages (〈10−2 ML), reaction was attributed to a "direct'' abstraction mechanism, leading to energetic S2. As the coverage was increased above 10−2 ML, both "direct'' and "indirect'' PRXN dynamics were observed. Possible origins of these differing photoreaction dynamics are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458796
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  • 7
    Electronic Resource
    Electronic Resource
    Photochemistry of adsorbed molecules. VII. Ultraviolet photoejection and photodesorption of OCS on LiF(001) (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 3673-3684 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The UV photoejection and photodesorption of OCS on LiF(001) at 222 nm are reported. Translational energy and angular distributions were obtained by angle-resolved TOF mass spectrometry. Energetic photoejection (PEJ) product, characterized by a peak translational energy T'p∼0.3 eV, was detected for (approximately-greater-than)0.5 ML coverages of OCS(ad). The PEJ angular distribution was sharply peaked around the surface normal, ∼cos 18θ. The initial absorption of energy was into the chromophore of an OCS molecule. Molecular photodesorption (PDES) product, characterized by low translational energy, was detected for coverages ≥10−2 ML. The translational energy distribution P(T') was found to be a sensitive function of detection angle, adsorbate coverage and laser energy. Peak translational energies and FWHM's were ∼0.05 and ∼0.20 eV, respectively. Angular distributions were also sensitive to coverage, narrowing from ∼cos θ to cos 11θ with increasing coverage. Photodesorption is thought to involve absorption of radiation by defect centers in the LiF(001), with conversion of the absorbed energy into phonons which, following propagation to the surface, induce desorption of OCS(ad).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458797
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  • 8
    Electronic Resource
    Electronic Resource
    High potency dipeptide sweeteners. 1. L-Aspartyl-D-phenylglycine esters (1990)
    s.l. : American Chemical Society
    Journal of medicinal chemistry 33 (1990), S. 1052-1061 
    Details
    ISSN: 1520-4804
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jm00165a027
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  • 9
    Electronic Resource
    Electronic Resource
    UV photodissociation and photodesorption of adsorbed molecules. 1. Methyl bromide on lithium fluoride(001) (1984)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 88 (1984), S. 6100-6103 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j150669a009
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  • 10
    Electronic Resource
    Electronic Resource
    Implications of the distribution of seismicity near Lake Bogoria in the Kenya Rift (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 105 (1991), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Previous seismicity studies in the Kenya Rift have not been able to determine accurately depths of earthquakes, nor have most of them determined epicentres precisely enough to allow correlation of the seismicity with particular surface features. We operated a small dense seismic array for 3 months near Lake Bogoria in the Kenya Rift with the aim of locating microearthquakes in 3-D. 572 earthquakes, 81 per cent with ML 〈 1.0, have been located. The majority of the events are associated with the larger older faults on the Rift shoulder rather than the young ‘grid’ faults in the centre of the Rift. Seismic activity in the central trough cannot be related directly to the surface faulting; we infer that it indicates the presence of deep buried faults. This possibility has important implications for extension estimates and models of the Rift. Most of the activity occurs at depths less than 12 km, and no normal activity is deeper than 16 km. There is a peak in seismic activity at a depth of 9–10 km and the cut-off depth for brittle failure is taken at 12 km. The depth distribution of these earthquakes is similar to that found in other intracontinental areas with similar heat flow which suggests that the crust beneath the Kenya Rift is of normal rheology.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1991.tb00804.x
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