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  • 1
    Electronic Resource
    Electronic Resource
    Microscopic shifts of size-assigned p-cresol/H2O-cluster spectra (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 1717-1723 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: p-cresol and its complexes with H2O and CH3OH were cooled in a pulsed supersonic free jet and studied by resonant multiphoton ionization with time-of-flight mass analysis. Detailed mass and concentration analysis allowed an unambiguous assignment of cluster size. The electronic origins of p-cresol (H2O)1,2,3 show irregular red- and blueshifts with change of cluster size, which is referred to the bivalent role of p-cresol as proton donor and acceptor. Ab initio and semiempirical quantum chemical calculations support this interpretation and show the spectral shifts to be essentially due to the inductive effect of the solvent molecules Y exerted on X in X-H...Y. While the vibronic bands of p-cresol (H2O)2 are quite broad, those of p-cresol (H2O)3 are sharp again. The ab initio calculations show that this may be attributed to the quite rigid "open cyclic'' structure of p-cresol (H2O)3. Our experimental and theoretical investigations show a completely analogous behavior of phenol (H2O)1,2,3 clusters
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459944
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  • 2
    Electronic Resource
    Electronic Resource
    Preparation and characterization of CeO2-based superconducting field effect transistors (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 8146-8149 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: High-Tc superconducting field effect transistors using CeO2 as the dielectric layer in combination with ultrathin YBa2Cu3O7−δ layers have been prepared and investigated. The preparation process of these devices is described in detail. CeO2 is very compatible with ultrathin YBa2Cu3O7−δ layers, resulting in Tc values consistent with SrTiO3-based superconducting field effect transistors. The dielectric constant and the breakdown field of the CeO2 layer are reproducible in all investigated samples, yielding values for εr≈20 and Ebd≈2×108 V/m. This results in a charge transfer of ΔN=±2 μC/cm2. In the charge carrier enhancement mode this value is close to SrTiO3-based superconducting field effect transistors. So far, the maximum achieved modulation of the charge carrier density by the use of CeO2 as dielectric is 1.5%. © 1994 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.357865
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  • 3
    Electronic Resource
    Electronic Resource
    p-type doping of CdTe with a nitrogen plasma source (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 2343-2346 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report here on the growth and the characterization of p-type CdTe grown by molecular beam epitaxy on (001) Cd0.96Zn0.04Te substrates. Nitrogen has been used as a dopant, which is activated in an electron cyclotron resonance plasma source. The carrier concentration was determined using a C/V profiler. Nitrogen has been successfully incorporated substitutionally and hole densities up to 2.6×1017 cm−3 have been achieved. In addition we present data from x-ray diffraction and photoluminescence, which demonstrate the effect of self-compensation on the nitrogen-doped CdTe layers. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361160
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  • 4
    Electronic Resource
    Electronic Resource
    YBa2Cu3O7 Josephson junctions and dc SQUIDs by mechanically induced growth disorder (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 3220-3222 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A simple and reproducible method for the fabrication of high-Tc Josephson junctions and SQUIDs is presented. A very weak disturbance is produced by pressing a diamond needle onto the substrate surface before film deposition. The junction parameters such as the critical current Ic, the IcRn product, or β=2IcL/Φ0 (with L the self-inductance of the SQUID loop) are accessible by controlling the film thickness and can be varied by several orders of magnitude. The junctions usually have critical current densities jc in the range of 5×104–1×105 A/cm2 at 77 K and show Shapiro steps when exposed to rf power. The current-voltage characteristics are resistively shunted junctionlike and nonhysteretic. In dc SQUIDs a maximum peak-to-peak voltage response to dc flux of up to 12 μV at 77 K is observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.357513
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  • 5
    Electronic Resource
    Electronic Resource
    High-superconducting critical current densities in YBa2Cu3O7/PrBa2Cu3O7 superlattices (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 59 (1991), S. 1626-1628 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Well-ordered [(YBa2Cu3O7)nY/(PrBa2Cu3O7)nPr)]m superlattices with high superconducting critical temperatures were prepared by sequential reactive dc sputtering. The superconducting critical current density at 4.5 K reaches values as high as 1.1×107 A/cm2 for a sample with nY = 2 and nPr = 1 and 3.8×106 A/cm2 for nY = 1 and nPr = 3, indicating that the coupling of the CuO2 layers is not necessary for high-jc values. The angular dependence jc(cursive-phi) is determined by the component of the magnetic field perpendicular to the a-b planes and shows that these superlattices are two-dimensional systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.106251
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  • 6
    Electronic Resource
    Electronic Resource
    CeO2: An alternative insulator material for superconducting field effect devices (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 64 (1994), S. 1871-1873 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The properties of high-Tc superconducting field-effect devices using CeO2 as an insulating layer have been studied. The dielectric constant and hence the achieved charge transfer for constant gate voltage and equivalent geometry is smaller as compared to the established SrTiO3 dielectric. This is mostly compensated by better insulating properties. The observed field effects for a fixed amount of charge transfer are very similar to those obtained with the SrTiO3 dielectric, indicating that the observed field effects are truly due to changes in the charge carrier density and not due to field-induced stresses in the multilayer structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.111783
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  • 7
    Electronic Resource
    Electronic Resource
    Persistent photoconductivity in Cu(In,Ga)Se2 heterojunctions and thin films prepared by sequential deposition (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 73 (1998), S. 223-225 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A characteristic, reversible metastability is observed for Cu(In,Ga)Se2 thin films and ZnO/CdS/Cu(In,Ga)Se2 heterojunctions. Annealing at 80 °C leads to a decrease of the dark conductivity of the thin films by up to a factor of 2 at room temperature and several orders of magnitude when measured at lower temperatures. By exposure to light, the initial state can be re-established. This reenhancement of the dark conductivity can be looked at as persistent photoconductivity. Admittance measurements at Cu(In,Ga)Se2 heterojunction solar cells display a reversible shift of the activation energy of a distinct dielectric loss peak ranging from 70 to about 160 meV upon illumination or annealing at 80 °C, respectively. We propose that both phenomena as well as commonly observed light-soaking effects of Cu(In,Ga)Se2 solar cells have a common origin. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.121762
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  • 8
    Electronic Resource
    Electronic Resource
    Structure and vibrations of the phenol-ammonia cluster (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 102 (1995), S. 9197-9204 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The phenol-ammonia 1:1 complex has been investigated by mass resolved hole burning spectroscopy and ab initio methods at the HF/6-31G(d,p) and HF/6-31++G(d,p) levels of theory. By means of spectral hole burning four bands in the region of intermolecular vibrations could be assigned to the 1:1 complex. The ab initio computed cluster structure and its normal vibrations are reported and compared to the experimental results. Anharmonic calculations were carried out for the ammonia torsion. The results are compared to structurally related complexes. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.468869
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  • 9
    Electronic Resource
    Electronic Resource
    Intermolecular vibrations of the phenol dimer revealed by spectral hole burning and dispersed fluorescence spectroscopy (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 103 (1995), S. 9918-9928 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Inter- and intramolecular vibrations of the Phenol dimer have been examined using spectral hole burning and dispersed fluorescence spectroscopy. The dispersed fluorescence spectra have been recorded via excitation of the electronic donor origin and all intermolecular vibrational transitions. The Franck–Condon intensity pattern allowed a straightforward assignment of the ground state vibrational frequencies to the excited state frequencies, which were examined by hole-burning spectroscopy. The existence of another conformer that possibly absorbs in the region of interest was ruled out by hole-burning spectroscopy. For obtaining the hole-burning spectra, the electronic origin of the donor chromophore was analyzed, while the hole-burning laser was scanned over the region of interest. As both acceptor and donor part belong to one molecule the hole-burning signal could be analyzed via fluorescence from one of the chromophores. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.470686
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  • 10
    Electronic Resource
    Electronic Resource
    Structure and vibrations of phenol⋅CH3OH (CD3OD) in the electronic ground and excited state, revealed by spectral hole burning and dispersed fluorescence spectroscopy (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 103 (1995), S. 584-594 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The intermolecular vibrations of phenol(CH3OH)1 and its deuterated isotopomer d-phenol(CD3OD)1 were examined by comparing the vibrational frequencies of the electronic ground and excited state with the results of ab initio normal mode calculations at the Hartree–Fock level, using the 4-31G* and 6-31G** basis sets. Full energy minimization showed a translinear structure similar to phenol(H2O)1 or to the water dimer. Dispersed fluorescence spectra have been recorded via excitation of the electronic cluster origin and several intermolecular vibrational transitions. The Franck–Condon intensity pattern allowed an assignment of the ground state vibrational frequencies to the excited state frequencies, which were examined by resonance enhanced multiphoton ionization and hole burning spectroscopy. The existence of another conformer that possibly absorbs in the region of interest was ruled out by hole burning spectroscopy of the phenol(CH3OH)1 cluster. A full assignment of all intermolecular vibrations of this hydrogen bonded cluster in the S0 state could be given for the first time on the basis of ab initio calculations and a combination of different spectroscopical methods. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.470093
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