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  • 1
    Electronic Resource
    Electronic Resource
    A two-dimensional quantum crystal: H2 on NaCl(100) (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 109 (1998), S. 4990-4996 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Monolayers of H2 on NaCl(100) at 5.2 K have been prepared from both normal and para-enriched hydrogen and examined by polarized infrared spectroscopy. Vibrational features associated with J=0 and J=1 molecules are distinguished. The spectroscopic data are consistent with hydrogen adsorbed to two distinct sites: surface Na+ ions and Cl− ions. For the para-enriched sample a two-dimensional crystal structure is proposed in which J=0 molecules reside on Na+ ions and J=1 molecules cover Cl− sites. The polarization measurements show that all transition dipoles are perpendicular to the NaCl(100) surface. The mechanism for the infrared absorption is through electric field induced transition dipoles. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.477111
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Chalcopyrite/defect chalcopyrite heterojunctions on the basis of CuInSe2 (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 2902-2909 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A new model for the formation of heterojunctions in polycrystalline CuInSe2 thin films on the basis of surface analysis experiments is presented. In situ photoemission measurements of CuInSe2 clearly show the existence of an In-rich n-type surface layer on samples relevant for solar-cell devices. Furthermore, this layer has been identified as an ordered vacancy compound (OVC) with a band gap of about 1.3 eV. The previous model of the CuInSe2/CdS solar cell with a p-n heterojunction between p-type CuInSe2 and n-type CdS is replaced by the model of a chalcopyrite/defect chalcopyrite heterojunction between p-type bulk CuInSe2 and the In-rich n-type OVC. The existence of this junction was proven directly by evaporating an ohmic metal contact onto the surface n-type layer and measuring the spectral quantum efficiency and electron-beam-induced current of this device. The band offsets of CuInSe2-based devices have been determined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353020
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  • 3
    Electronic Resource
    Electronic Resource
    Small signal time-of-flight transients (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 1985-1989 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The behavior of a pulse shaped charge disturbance injected into a low-conductivity semiconductor in the presence of traps is investigated. The statistical moments are used to characterize the charge distribution curve as a function of position and time under the condition of a constant electric field. In the limit when the first and second moments are sufficient to characterize the charge distribution an explicit expression for the small signal transient waveform is given and discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.334383
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  • 4
    Electronic Resource
    Electronic Resource
    Laser with guided pump and free-propagating resonator mode using diffusion-bonded rectangular channel waveguides (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 77 (2000), S. 3505-3507 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report the laser performance of a short diffusion-bonded diode-pumped Yb:YAG rectangular channel waveguide of 100 μm cross section. Using an end-pumped configuration guiding only the slow axis, a high overlap of the pump mode and the nonguided resonator mode is achieved. With 4 W of pump power from two 60 μm high-power broad-stripe diodes, 0.7 W of output power with nearly diffraction-limited performance is obtained. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1329331
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  • 5
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    Adaptive non-collinear autocorrelation of few-cycle pulses with an angular tunable bi-mirror (2016)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2016-02-03
    Description: Adaptive autocorrelation with an angular tunable micro-electro-mechanical system is reported. A piezo-actuated Fresnel bi-mirror structure was applied to measure the second order autocorrelation of near-infrared few-cycle laser pulses in a non-collinear setup at tunable superposition angles. Because of enabling measurements with variable scaling and minimizing the influence of distortions by adaptive self-reconstruction, the approach extends the capability of autocorrelators. Flexible scaling and robustness against localized amplitude obscurations are demonstrated. The adaptive reconstruction of temporal frequency information by the Fourier analysis of autocorrelation data is shown. Experimental results and numerical simulations of the beam propagation and interference are compared for variable angles.
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
    Published by American Institute of Physics (AIP)
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  • 6
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    Highly periodic laser-induced nanostructures on thin Ti and Cu foils for potential application in laser ion acceleration (2016)
    American Institute of Physics (AIP)
    Details
    Publication Date: 2016-03-16
    Description: The feasibility of femtosecond laser-induced periodic nanostructures on thin Ti and Cu foils (thickness down to 1  μ m) is demonstrated. At pulse durations of 120 fs and a wavelength of 400 nm, periods of 61 nm to 320 nm were obtained. Particle-in-cell simulations of laser ion acceleration processes with such nanostructured targets indicate their potential for high energy particle physics applications. In particular, a measurable enhancement of the proton cut-off energy and a significant enhancement of the number of accelerated particles compared to non- or weakly structured targets of same thickness and material are expected.
    Print ISSN: 0021-8979
    Electronic ISSN: 1089-7550
    Topics: Physics
    Published by American Institute of Physics (AIP)
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