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  • 1
    Digitale Medien
    Digitale Medien
    Quenching rate constants of excited halogen atoms in quartet states (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 100 (1994), S. 4876-4883 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: Excited halogen atoms in quartet spin states F*(2p43s, 4P5/2), Cl*(3p44s, 4P5/2), and Br*(4p45s, 4P5/2) were produced from helium sensitized radiation chemical decomposition of SF6, CF3Cl, CF3Br, and CF2Br2. Quenching rate constants of these excited halogen atoms by simple gas molecules such as O2, N2, H2, CO, CO2, NO, NO2, N2O, CH4, C2H6, and Xe including parent molecules were determined from absorption decay curves at 685.8 nm for F*, 837.5 nm for Cl*, and 827.4 nm for Br*. The optical densities were assumed to be proportional to (number of excited atoms per one cubic centimeter)0.9. The quenching rate constants obtained here were compared to those reported of metastable rare-gas atoms and an excited oxygen atom O*(2p33s, 5S2), and further discussed in terms of several theoretical kinetic models.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.467207
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  • 2
    Digitale Medien
    Digitale Medien
    Quartet excited halogen atoms produced in the electron pulse irradiation of rare gases containing halogenated compounds (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 103 (1995), S. 999-1005 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: Quartet excited halogen atoms F*(2p4 3s,4PJ), Cl*(3p4 4s,4PJ), Br*(4p4 5s,4PJ), and I*(5p4 6s,4PJ), where the J's are 5/2, 3/2, and 1/2, were found to be produced in the electron pulse irradiation of Ne or Ar containing one of SF6, CCl4, CClF3, CBrF3, CBr2F2, and CF3I. The population distribution ratios at the stage of production were 1.0(J=5/2):0.41(J=3/2):0.06(J=1/2) for F* in Ne containing SF6, 1.0(J=5/2):0.27(J=3/2):0.14(J=1/2) for Cl* in Ne containing CCl4, 1.0(J=5/2):0.29(J=3/2):0.2–0.3(J=1/2) for Br* in Ne containing CBr2F2, and 1.0(J=5/2):0.13(J=3/2):0.54(J=1/2) for I* in Ar containing CF3I. The observed ratios considerably differ from those calculated from the Boltzmann distribution law. F*(4P5/2), F*(4P3/2), and Cl*(4P5/2) are mainly produced by the reactions of lowest triplet excited diatomic molecules of neon with SF6 and CCl4. Cl*(4P3/2) and Cl*(4P1/2) are produced in a rapid process and deactivated into lower Cl*(4P5/2). Several reaction channels probably contribute to the formation of Br*(4PJ) and I*(4PJ). Rate constants for reactions of triplet excited diatomic molecules of neon or argon with these parent molecules were determined from observed absorption decay curves for Ne2* or Ar2* in the presence of parent molecules. © 1995 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.470700
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  • 3
    Digitale Medien
    Digitale Medien
    Polymerization and Dimerization of Vinylcarbazole. II. Relation between Reactive Intermediates and Final Products in Irradiated Benzonitrile Solutions (1974)
    s.l. : American Chemical Society
    Macromolecules 7 (1974), S. 262-264 
    Details
    ISSN: 1520-5835
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ma60039a002
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  • 4
    Digitale Medien
    Digitale Medien
    Band gap shrinkage in GaInAs/GaInAsP/InP multi-quantum well lasers (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 279-281 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We investigated a band gap shrinkage in both lattice-matched and compressive strained GaInAs/GaInAsP/InP multi-quantum well lasers. The band gap shrinkage is obtained from the broadening of the low energy side in the spectrum by considering effects of an intraband scattering and a fundamental band edge. It amounts to 20–25 meV at sheet carrier densities of above 1012 cm−2, and shows n1/1.3 dependence at low carrier densities and n1/3 dependence at higher densities. These dependencies agree well with theoretical predictions in the quantum well.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.352129
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  • 5
    Digitale Medien
    Digitale Medien
    The magnetic properties of doubly oriented 3% Si-Fe and its application (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 5577-5579 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Doubly oriented 3% Si-Fe having high permeability was prepared by a cross-rolling method and secondary recrystallization. We examined two applications of this doubly oriented material. One application is a three-phase power transformer. Watt loss of the transformer using doubly oriented 3% Si-Fe in yokes was found to be lower than that of the transformer using singly oriented 3% Si-Fe, especially at high induction. The lower loss of the transformer using doubly oriented 3% Si-Fe was explained by magnetic domain wall movement observation and FEM calculation. The magnetic flux can rotate more smoothly in the yokes of the transformer using doubly oriented 3% Si-Fe than in those parts of the singly oriented 3% Si-Fe transformer. Doubly oriented 3% Si-Fe is also effective to decrease the loss at "hot point.'' Another application is a punched U-I shaped core, in which the flux is rotated at the corner. Doubly oriented 3% Si-Fe core was magnetized to high induction easier than those of singly oriented 3% Si-Fe and nonoriented 3% Si-Fe. These results show that doubly oriented 3% Si-Fe is one of the best materials for the applications in which magnetic flux is rotated.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.345890
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  • 6
    Digitale Medien
    Digitale Medien
    Reactions of highly excited oxygen atoms O(2p33s,5S) with simple gas molecules (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 97 (1992), S. 9094-9098 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: The electron pulse irradiation of 10 atm He containing one of CO, CO2, NO, NO2, or N2O at small amounts produced highly excited oxygen atoms O(2p33s,5S), which subsequently disappeared by their reactions with parent molecules. The rate constants have been determined from the absorption decay curves at 777.3 nm O(2p33p,5P)←O(2p33s,5S). The rate constants for the reactions of O(2p33s,5S) with Xe, H2, N2, CH4, and C2H6 could be determined in the irradiation of mixtures of He, O2, and these gases with electron pulses. The upper limit of a quenching rate constant was estimated for Kr. The observed rate constants showed good correlation with the quenching rate constants of Kr(4p55s,3P2) or Xe(5p56s,3P2) by the same gas molecules.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.463336
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  • 7
    Digitale Medien
    Digitale Medien
    Lyman-α, Lyman-α coincidence detection in the photodissociation of doubly excited molecular hydrogen into two H(2p) atoms (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 3016-3021 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: Photodissociation processes of the doubly excited states of H2 into H(2p)+H(2p) have been studied using a coincidence detection of two Lyman-α photons. Coincidence spectra have been measured in the energy region of 29.0–36.0 eV. The intensity of the observed coincidence peak corresponding to two Lyman-α photons increases with increasing energy from its threshold which is about 29 eV. The main precursor of the two H(2p) atoms is assigned to the doubly excited Q2 1Πu state.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.453943
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  • 8
    Digitale Medien
    Digitale Medien
    Field-induced refractive index variation spectrum in a GaInAs/InP quantum wire structure (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 58 (1991), S. 1015-1017 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We report the electric field induced refractive index variation spectrum in a GaInAs/InP multilayered (three layers) quantum wire structure (λg∼1.48 μm) in the range 1.484–1.65 μm with the maximum positive index variation of 4% at around 1.52 μm at an applied reverse bias voltage of 3 V. We have also observed the anisotropic property of the index variation with respect to the quantum wire direction to the input light. These multilayered quantum wire structures were fabricated by low-pressure electron cyclotron resonance reactive ion beam etching and low-pressure organometallic vapor phase epitaxy methods.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.104409
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  • 9
    Digitale Medien
    Digitale Medien
    Carbon dioxide laser photolysis of mixtures of dichlorofluoromethane-h and -d (1983)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 87 (1983), S. 3469-3473 
    Details
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/j100241a023
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  • 10
    Digitale Medien
    Digitale Medien
    A clinical study of Japanese patients with ulcer induced by low-dose aspirin and other non-steroidal anti-inflammatory drugs (2005)
    Oxford, UK : Blackwell Publishing Ltd
    Alimentary pharmacology & therapeutics 21 (2005), S. 0 
    Details
    ISSN: 1365-2036
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Background : The incidence and severity of non-steroidal anti-inflammatory drugs (NSAIDs)-induced gastro-duodenal ulcer have not been extensively studied in Japan.Aim : We performed a prospective study to clarify NSAIDs-induced gastro-duodenal injury, focusing especially on low-dose aspirin (L-A).Methods : Two hundred and thirty-eight patients with bleeding peptic ulcers admitted to our hospital. History of taking NSAIDs and anti-ulcer drugs was obtained from all patients who underwent endoscopic examinations. The lesion scores of patients taking L-A were classified numerically from zero (no lesion) to five (ulcer).Results : The NSAIDs were associated with 28.2% of hemorrhagic ulcers. The rates of patients using L-A, loxoprofen, diclofenac, and combination of two of these drugs were 27, 16, 10 and 9%, respectively. Co-administered anti-ulcer drugs were cytoprotective anti-ulcer drugs (27%), H2 receptor antagonists (16%), PPI (4%), and none (53%). In patients taking L-A, H2 receptor antagonists were used most frequently. The HP was positive in 63% of L-A-induced ulcer cases and in 69% of NSAIDs other than low-dose aspirin-induced ulcer cases. The lesion scores of patients taking L-A with H2 receptor antagonists or PPI were significantly lower than those of patients who were taking only L-A (P 〈 0.05).Conclusions : Approximately one-third of hospitalized patients with NSAIDs-induced hemorrhagic ulcer showed an association with L-A. Prospective randomized controlled trials including H2 receptor antagonists are required to establish preventive efforts aimed at L-A-induced gastro-duodenal injury.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2036.2005.02476.x
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