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  • 1
    Electronic Resource
    Electronic Resource
    Two-laser resonance-enhanced photoionization spectrum of benzene (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 3490-3497 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: This paper reports results of an experiment involving two-laser resonance-enhanced photoionization of benzene. The excitation sources were two frequency-doubled dye lasers. The first laser pumped the molecule to a selected vibronic level of its first excited singlet state (1B2u), from where it was ionized by a time-delayed pulse of the second laser. The ion yield depends on the intermediate vibronic state as well as on the wavelength of the ionizing laser. From the structures and intensities of the measured ion spectra we derived vibrational frequencies and molecular parameters of the ground electronic state of the ion to a remarkable accuracy. The contributions of autoionizing Rydberg levels to the ionization cross section can clearly be distinguished from direct ionization. Several resonance peaks were assigned to transitions to vibrational modes within these Rydberg states.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455859
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A novel diffraction phenomenon with the first order Fredericksz transition in a nematic liquid crystal film (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 83 (1998), S. 1337-1340 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present the experimental results of the Ar+ laser- and electric-field-induced diffraction effect in a planar-parallel-aligned nematic liquid crystal film. It is found that only one set of diffraction rings occurs in the second order Fredericksz transition; however, two sets of diffraction rings can occur in the first order Fredericksz transition. The appearance of two sets of rings distinguishes the first order Fredericksz transition from the second order. We propose a theoretical explanation for the phenomenon. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.366835
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  • 3
    Electronic Resource
    Electronic Resource
    Infrared photoresponse of (Mn,Sb) doped-Pb(Zr,Ti)O3/YBa2Cu3O7 heterostructure detectors (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 83 (1998), S. 4980-4984 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Mn- and Sb-doped PbZrTiO3 (PMSZT) thin-film pyroelectric infrared (IR) detectors have been fabricated on c-oriented YB2Cu3O7−x (YBCO) thin films. The thin-film heterostructure detectors were prepared by pulsed laser deposition on LaAlO3 (100) substrates. The YBCO layer in the PMSZT/YBO heterostructure was used as an atomic template for the epitaxial growth of the PMSZT thin films, as well as a nonsuperconducting electrode and IR reflector in the detector. Mn and Sb doping was used to tune the Pb(Zr,Ti)O3 transition temperature to a lower value (Curie temperature of ∼170 °C), and hence, to modify the pyroelectric and dielectric properties of the pyroelectric material. The PMSZT IR detectors were examined as to their photovoltage and photocurrent in response to IR source temperature, detector temperature, and chopper frequency. The experimental results show that the detector has relatively high IR sensitivity with a detectivity D* of ∼4×108 cm Hz1/2/W, and is capable of operating from room temperature to ∼170 °C. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.367301
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  • 4
    Electronic Resource
    Electronic Resource
    Very low threshold 1.55 μm grating coupled surface-emitting lasers for optical signal processing and interconnect (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 67 (1995), S. 2777-2779 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report in this work a record low threshold (∼4 mA, cw), 1.55 μm wavelength, grating-coupled surface-emitting laser (GCSEL) which rivals all other existing SELs in the 1.3 or/and 1.55 μm regions. Methods to improve the asymmetric far-field patterns and to obtain even lower threshold SELs are also demonstrated and/or suggested. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.114590
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  • 5
    Electronic Resource
    Electronic Resource
    Time-resolved-spectrum studies of GaN light emitting diodes (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 69 (1996), S. 3668-3670 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Time-resolved-emission spectra of InGaN and GaN light emitting diodes with different device structure are studied. Result shows that the UV generation from bulk materials and blue and green emissions from single quantum well devices are band edge recombination. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.117183
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  • 6
    Electronic Resource
    Electronic Resource
    An approach to fault diagnosis of chemical processes via neural networks (1993)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 39 (1993), S. 82-88 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: This article presents an approach to fault diagnosis of chemical processes at steadystate operation by using artificial neural networks. The conventional back-propagation network is enhanced by adding a number of functional units to the input layer. This technique considerably extends a network's capability for representing complex nonlinear relations and makes it possible to simultaneously diagnose multiple faults and their corresponding levels in a chemical process. A simulation study of a heptane-to-toluene process at steady-state operation shows successful results for the proposed approach.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690390109
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