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  • 1
    Digitale Medien
    Digitale Medien
    Indented barrier resonant tunneling rectifiers (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 4174-4176 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: This article concerns a novel negative-conductance device consisting of a series of N laterally indented barriers which exhibits resonant tunneling under one bias polarity and simple tunneling under the opposite one, thus acting as a rectifier. Electrons undergo resonant tunneling when the bias creates a band profile with N triangular wells which can each contain a resonant state. From 1 to N the addition of each indentation can be used to increase the current density and the rectification ratio, calculated at the current-peak bias at resonance, provided that at a given bias all the states in the triangular wells align each other with the emitter Fermi energy in order to form a resonance along the structure. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.363290
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  • 2
    Digitale Medien
    Digitale Medien
    Two-step barrier diodes (1988)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 52 (1988), S. 960-962 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Transmission probabilities and current densities of a two-step barrier heterostructure are calculated within the effective-mass approximation as a function of electron energy and applied bias. This system shows negative differential resistance under forward bias, because of a quasibound state in a triangular well, and no resonance under reverse bias, in the current density. The two-step barrier diode may show negative resistance in an ac field in the absence of a dc bias.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.99241
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  • 3
    Digitale Medien
    Digitale Medien
    Optical probing of interface roughness in resonant tunneling structures (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 82 (1997), S. 810-812 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We report on photoluminescence (PL) and photoluminescence-excitation measurements in GaAs/In0.1Ga0.9As/AlAs double-barrier tunneling structures as a function of bias voltage and temperature. We have observed a splitting in the quantum well photoluminescence due to island formation in the quantum well. We have a good correlation between the variation of integrated PL intensity, linewidth, and tunnel current bias for both lines. The temperature dependence of photoluminescence spectra shows that transfer of carrier between islands can be tuned by the applied bias and that states in different islands are populated by electrons in the resonant tunneling process. © 1997 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.365776
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  • 4
    Digitale Medien
    Digitale Medien
    Characterization of resonant tunneling paths in current–voltage characteristics line shapes (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 67 (1995), S. 2675-2677 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We analyze the current density-voltage characteristics of double-barrier tunneling diodes, with different spacer layers, within the framework of a Poisson solver together with a coherent tunneling approximation for transmission probabilities. We show that varying the spacer layer thickness, together with barrier heights, changes dramatically the current density-voltage characteristics line shape, which is revealed to be an important qualitative signature of the tunneling paths involved in the double-barrier diodes under operation. © 1995 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.114289
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  • 5
    Digitale Medien
    Digitale Medien
    Rheology of Cetyltrimethylammonium Tosylate-Water System. 1. Relation to Phase Behavior (1995)
    s.l. : American Chemical Society
    Langmuir 11 (1995), S. 3337-3346 
    Details
    ISSN: 1520-5827
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/la00009a013
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  • 6
    Digitale Medien
    Digitale Medien
    Multiphoton Dissociation of Polyatomic Molecules (1979)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Physical Chemistry 30 (1979), S. 379-409 
    Details
    ISSN: 0066-426X
    Quelle: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Thema: Chemie und Pharmazie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1146/annurev.pc.30.100179.002115
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  • 7
    Digitale Medien
    Digitale Medien
    Charge exchange of N2+2 with Ar (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 83 (1985), S. 5673-5676 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: The charge exchange of N2+2 is distinguished from charge exchange of N+ in the measurement of the differential cross section. N2+2 charge exchanges with argon to produce predominantly Ar+ in its ground state and N+2 in its C 2Σ+u and D 2Π states. A vibrational progression is observed corresponding to the vibrational frequency in the C state. Also observed is the charge exchange of N+2(A 2Πu). A simple model is used to explain the data.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.449641
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  • 8
    Digitale Medien
    Digitale Medien
    Ultrahigh resolution spectroscopy of C2−: The A 2Πu state characterized by deperturbation methods (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 82 (1985), S. 1723-1731 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: Spectra of the C2− B 2Σu+–X 2Σg+ transition have been obtained using a merged laser-ion beam spectrometer with sub-Doppler resolution. Strong perturbations of the B state by the previously unobserved A 2Πu state are analyzed to obtain the characteristics of the new state. The A state spectroscopic constants in wave numbers (with estimated standard errors) are found to be Te=4060±180, ωe=1656±20, ωexe=10.80±0.50, Be=1.630±0.005, and A=−24±1. All nine perturbations observed in this work and the five observed in the work of Herzberg and Lagerqvist are explained by the interaction of the A 2Πu state with the B state. These results, as well as the perturbation matrix elements, are compared with theoretical estimates and results for isoelectronic 13-electron species.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.448960
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  • 9
    Digitale Medien
    Digitale Medien
    Electron-impact dissociation of H3O+ (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 85 (1986), S. 3386-3394 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: Fragment cross sections for electron impact dissociation of H3O+ into OH+ and O+, and for dissociation of D3O+ into D2O+ have been measured in a crossed beam appartus for electron energies from threshold to 1000 eV. The cross sections for O+ and OH+ rise abruptly at threshold indicating that the mechanism for dissociation is via production of an electronically excited state of H3O+ and direct dissociation into O+ and OH+. At high energy the cross section has a falloff σ∝ln(E)/E expected in the Bethe-Born approximation. At 200 eV electron energy the cross sections for fragments are: D2O+, σ=6.7±1.8×10−17 cm2; OH+, σ=3.0±0.6×10−17 cm2; O+, σ=7.9±1.6×10−18 cm2. The observed threshold energies for OH+ and O+ production are 14±3 and 19±3 eV, respectively.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.450960
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  • 10
    Digitale Medien
    Digitale Medien
    Brain Metabolism of Progesterone, Coping Behaviour and Emotional Reactivity in Male Rats from Two Psychogenetically Selected Lines (1997)
    Oxford, UK : Blackwell Science Ltd
    Journal of neuroendocrinology 9 (1997), S. 0 
    Details
    ISSN: 1365-2826
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Brain metabolites of progesterone such as tetrahydroprogesterone (THP) act on GABAA receptors and have anxiolytic properties. The formation of THP and its 5α-reduced precursor, dihydroprogestrone (DHP) was measured in vitro in various microdissected brain areas obtained from males of two psychogenetically selected rat lines, i.e. the Roman High-(RHA/Verh) and Low-(RLA/Verh) Avoidance rats, which are known to differ in emotional reactivity and/or anxiety. The behavioural and neuroendocrine responses of these rats were also measured following exposure to a novel environment in two different test situations. The formation of DHP and THP was found to be significantly higher in the frontal cortex (FCX), and DHP in the bed nucleus of the stria terminalis (BST), of the hypoemotional RHA/Verh rats. In addition, enzymatic activity in the FCX was found to be inversely correlated with behavioural measures of anxiety. These results suggest that individual, possibly genetically-determined differences in brain production of endogenous anxiolytics derived from progesterone may account at least in part for the behavioural differences characterizing these two lines, and provide further evidence that neurosteroids acting on the GABAergic system may play an important role in modulating physiological and/or behavioural responses to environmental stressors.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1046/j.1365-2826.1997.t01-1-00571.x
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