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  • 1
    Digitale Medien
    Digitale Medien
    Reactions of 4.5- and 6.0-eV photochemically produced tritium atoms with fluoroform (1978)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 82 (1978), S. 971-975 
    Details
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/j100498a001
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  • 2
    Digitale Medien
    Digitale Medien
    Temperature and impact ionization effects on fT of advanced bipolar transistors (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 2402-2407 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Modeling the cutoff frequency (fT) of the advanced bipolar transistors at avalanche breakdown has been developed. The analytical equations developed account for temperature and impact ionization effects on fT and high-current effects at the collector-base junction. Process sensitivity of the collector charging time at the avalanche breakdown regime has been examined. The experimental data reported in the literature are compared in support of the model. Good agreement between the model prediction and measurement is obtained.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.349391
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  • 3
    Digitale Medien
    Digitale Medien
    Electronic spectroscopy of silver dimer rare gas complexes (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 6249-6256 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: Vibrationally resolved electronic spectra are reported for the metal dimer-rare gas complexes Ag2–Ar and Ag2–Kr. These spectra are obtained using resonant two-photon photoionization in the energy region near the Ag2 B←X electronic transition (280–285 nm). Both complexes exhibit extensive activity in three vibrational modes, making it possible to determine vibrational constants, anharmonicities, and cross-mode couplings. An unusual cancellation of factors results in the Kr complex (ω'e =72.6 cm−1) having nearly the same metal-rare gas stretching frequency as the Ar complex (ωe=73.9 cm−1). Progressions extending over a significant range of the excited state potential surfaces make it possible to derive the excited state dissociation energies (D'0=755 and 1205 cm−1 for Ar and Kr, respectively). Combination with the red-shifted electronic state origins yields the corresponding ground state dissociation energies (D(large-closed-square)0=275 and 394 cm−1 for Ar and Kr, respectively). Potential energy surfaces are investigated for excited and ground states of both complexes.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.461545
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  • 4
    Digitale Medien
    Digitale Medien
    Photodissociation spectroscopy of Mg+–H2O and Mg+–D2O (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 97 (1992), S. 8886-8895 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: Mg+–H2O ion–molecule complexes are produced in a pulsed supersonic nozzle cluster source. These complexes are mass selected and studied with laser photodissociation spectroscopy in a reflectron time-of-flight mass spectrometer system. An electronic transition assigned as 2B2←X 2A1 is observed with an origin at 28 396 cm−1. The spectrum has a prominent progression in the metal-H2O stretching mode with a frequency (ω'e) of 518.0 cm−1. An extrapolation of this progression fixes the excited state dissociation energy (D'0) at 15 787 cm−1. The corresponding ground state value (D‘0) is 8514 cm−1 (24.3 kcal/mol). The solvated bending mode, and symmetric and asymmetric stretching modes of water are also active in the complex, as are the magnesium bending modes. A second electronic transition assigned as 2B1←X 2A1 is observed with an origin at 30 267 cm−1 and a metal stretch frequency for Mg+–H2O of 488.5 cm−1 (ΔG1/2). Spectra of both excited states are also observed for Mg+–D2O. Partially resolved rotational structure is analyzed for both isotopes, leading to the conclusion that the complex has a structure with C2v symmetry. This study was guided by ab initio calculations by Bauschlicher and co-workers, which provide accurate predictions of the electronic transition energies, vibrational constants, and dissociation energies.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.463363
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  • 5
    Digitale Medien
    Digitale Medien
    Highly sensitive quantum well infrared photodetectors (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 86 (1999), S. 2779-2784 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: A fundamentally new method for light coupling in quantum well infrared photodetectors that provides a ten-fold improvement over an optimized grating coupler is presented. It is based on the prism-film coupler concept developed earlier for selective mode coupling into integrated optical circuits. In this article this concept is specifically used to turn the incident electric field from one that is polarized parallel to the quantum well layer to one that is mostly perpendicular to the layer, thereby increasing dramatically the sensitivity of the quantum well infrared photodetector. Detailed sample design and its computer simulation results are given and discussed. © 1999 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.371125
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  • 6
    Digitale Medien
    Digitale Medien
    Photodissociation spectroscopy of the Mg+–CO2 complex and its isotopic analogs (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 98 (1993), S. 1867-1875 
    Details
    ISSN: 1089-7690
    Quelle: AIP Digital Archive
    Thema: Physik , Chemie und Pharmazie
    Notizen: Mg+–CO2 ion–molecule cluster complexes are produced by laser vaporization in a pulsed nozzle cluster source. The vibronic spectroscopy in these complexes is studied with mass-selected photodissociation spectroscopy in a reflectron time-of-flight mass spectrometer. Two excited electronic states are observed (2) 2Σ+ and 2Π. The 2Π state has a vibrational progression in the metal–CO2 stretching mode (ωe'=381.8 cm−1). The complexes are linear (Mg+–OCO) and are bound by the charge–quadrupole interaction. The dissociation energy (D0‘) is 14.7 kcal/mol. Corresponding spectra are measured for each of the 24, 25, and 26 isotopes of magnesium. These results are compared to theoretical predictions made by Bauschlicher and co-workers.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.464221
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  • 7
    Digitale Medien
    Digitale Medien
    Erratum: The diffraction of waves by a penetrable ribbon [J. Math. Phys. 4, 65 (1963)] (1988)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 29 (1988), S. 721-722 
    Details
    ISSN: 1089-7658
    Quelle: AIP Digital Archive
    Thema: Mathematik , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.528013
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  • 8
    Digitale Medien
    Digitale Medien
    Site selection of metal complexation in the semibullvalene skeleton. Exigencies of palladation (1973)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 95 (1973), S. 4756-4758 
    Details
    ISSN: 1520-5126
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ja00795a050
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  • 9
    Digitale Medien
    Digitale Medien
    Pulse shepherding in nonlinear fiber optics (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 80 (1996), S. 3174-3178 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: In a wavelength division multiplexed fiber system, where pulses on different wavelength beams may copropagate in a single mode fiber, the cross-phase-modulation (CPM) effects caused by the nonlinearity of the optical fiber are unavoidable. In other words, pulses on different wavelength beams can interact with and affect each other through the intensity dependence of the refractive index of the fiber. Although CPM will not cause energy to be exchanged among the beams, the pulse shapes and locations on these beams can be altered significantly. This phenomenon makes possible the manipulation and control of pulses copropagating on different wavelength beams through the introduction of a shepherd pulse at a separate wavelength. How this can be accomplished is demonstrated in this paper. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.363256
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  • 10
    Digitale Medien
    Digitale Medien
    Photoluminescence measurements of tensile-strained GaAs/In0.07Al0.93As quantum wells (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 3192-3195 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: GaAs/In0.07Al0.93As tensile-strained quantum wells were grown on [001] GaAs substrates using molecular-beam epitaxy. The incorporation of tensile strain is made possible by preparing a 1-μm-thick In0.07Al0.93As relaxed buffer which is followed by the growth of quantum wells. The strain of the GaAs was measured using Raman spectroscopy and photoluminescence. The photoluminescence measurements from wells ranging in thickness from 25 to 100 A(ring) reveal that the observed optical transition originates from the electron–light hole recombination for a 100 A(ring) well and from the electron–heavy hole recombination if the well thickness is less than 40 A(ring). Therefore, a thick Al-rich InxAl1−xAs relaxed buffer on the GaAs substrate can be used to engineer the relative energy position of the light and heavy holes for GaAs-based quantum wells. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.361263
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