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  • 1
    Electronic Resource
    Electronic Resource
    Angularly resolved rotational energy transfer in highly vibrationally excited states: Na2(v=31)–Ne (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 4252-4259 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The scattering of high vibrationally excited sodium molecules Na2(v=31) with Ne atoms at 180 meV collision energy is investigated in a crossed molecular beam arrangement using laser optical methods. Angularly resolved rotationally inelastic and vibrationally elastic cross sections ji→jf are measured for ji =5, 7, and 9≤jf ≤25. Pronounced rotational rainbow maxima are observed, the angular position of which indicates a significantly larger anisotropy of the interaction potential compared to that of Na2(v=0)–Ne. Except for the increase of the anisotropy the vibrational excitation has little effect on the dynamics of rotational energy transfer. Good agreement with a new semiempirical Na2–Ne potential surface V(r,R,γ) is found.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.460611
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  • 2
    Electronic Resource
    Electronic Resource
    Study of a microwave plasma cathode : Proceecings of the fourth International Conference on Ion Sources (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 2598-2600 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A microwave plasma cathode which will be used in CHORDIS source has been developed. In this paper, the structure and the working property of the cathode are described.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1142850
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  • 3
    Electronic Resource
    Electronic Resource
    Microwave discharge theory for the microwave ion source : Proceecings of the fourth International Conference on Ion Sources (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 2601-2603 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: This article is about physical foundation of the microwave plasma ion source. The expressions to describe some physical regulations are given. The results show that the source is operated in the optimum state under the condition of electron cyclotron resonance (ωz=ω). This theory can also be applied to the microwave plasma cathode.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143825
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  • 4
    Electronic Resource
    Electronic Resource
    Transport property in narrow barrier GaAs/AlAs superlattice under hydrostatic pressure (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 4259-4261 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The current–voltage (I–V) characteristics of a doped weakly coupled GaAs/AlAs superlattice (SL) with narrow barriers are measured under hydrostatic pressure from 1 bar to 13.5 kbar at both 77 and 300 K. The experimental results show that, contrary to the results in SL with wide barriers, the plateau in the I–V curve at 77 K does not shrink with increasing pressure, and becomes wider after 10.5 kbar. It is explained by the fact that the EΓ1–EΓ1 resonance peak is higher than the EΓ1–EX1 resonance peak. At 300 K, however, because of the more important contribution of the nonresonant component to the current, the plateau shrinks with increasing pressure. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.370340
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  • 5
    Electronic Resource
    Electronic Resource
    Focusing characteristics of intense beam solenoid lens (1999)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 70 (1999), S. 3303-3307 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: In this article, by solving the nonlinear envelope equation of the intense beam in the cylindrical coordinate system, we have obtained the varying relations of the beam radius and the beam divergent angle with the paramedics (the magnetic induction strength in solenoid lens, the characteristic quantity of beam intensity, the beam emittance, the initial beam radius, and initial beam divergent angle). By theoretical analysis for the relations, we have obtained the beam peak radius and beam peak position in solenoid lens, the beam waist radius and beam waist position in the case of perfect focusing. In the ideal focusing condition, the radius of intense beam solenoid lens should not be less than the beam peak radius; the length of the solenoid lens must not be less than the beam peak position; and in order to gain optimum focusing, an optimal length should be selected; the magnetic induction strength must not be less than the threshold for getting a focusing beam through solenoid lens, and its optimum value should be selected so as to obtain the minimum value of beam divergent angle at the exit port for getting an perfect focusing output beam. The conclusions in this article have some guiding significance for the design and operation of the intense beam solenoid magnetic lens.© 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1149908
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  • 6
    Electronic Resource
    Electronic Resource
    Photovoltage and photoreflectance spectroscopy of InAs/GaAs self-organized quantum dots (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 73 (1998), S. 2657-2659 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present a detailed study of the interband excitonic transitions of InAs/GaAs self-organized quantum dots (QDs) based on photovoltage (PV), photoreflectance (PR) and photoluminescence (PL) spectroscopy. At room temperature, the interband absorption transitions of QDs have been observed by using PV spectrum, which clearly exhibits four well-resolved excitonic absorption peaks. The absorption line shape is Gaussian-like. Furthermore, the corresponding excitonic transitions are also observed in PR experiment at 77 K. The first derivative of a Gaussian profile can fit the experimental data well. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.122544
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  • 7
    Electronic Resource
    Electronic Resource
    Guided-wave acousto-optic Bragg diffraction in indium gallium arsenide phosphide waveguides (1997)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 70 (1997), S. 3185-3187 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Theoretical and experimental studies on guided-wave acousto-optic (AO) Bragg diffraction in a composite indium gallium arsenide phosphide (InGaAsP) planar waveguide were carried out. In this letter, the experimental results of the excitation and propagation of a 〈110〉-directed surface acoustic wave (SAW) at the center frequency of 167 MHz, and the AO Bragg diffraction at a 1.31 micron wavelength in In0.22Ga0.78As0.47P0.53 waveguide are reported. An AO Bragg diffraction efficiency as high as 14% was achieved at an acoustic drive power of 8.5 mW with an interaction length (transducer aperture) of only 1.0 mm. Two orders of magnitude improvement in the Bragg diffraction efficiency versus rf drive power should be achievable by the optimization of the SAW transducer and the optical waveguide parameters. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.119153
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  • 8
    Electronic Resource
    Electronic Resource
    Space-charge neutralization lens and its application (1993)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 64 (1993), S. 1437-1441 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The space-charge neutralization lens (S-C neutralization lens) is investigated from the theoretical point of view. The working parameters and the focal length formulas of the lens are given. According to this article, a S-C neutralization lens has been designed and used as a focusing and transmission unit in the intense beam facility at the Institute of Nuclear Research of Lanzhou University. The experiments show that it has an excellent operating characteristic for focusing intense beams and adjusting optical-path matching.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144058
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  • 9
    Electronic Resource
    Electronic Resource
    High-resolution electron microscopic study of the interface between diamond film and its substrate (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 63 (1993), S. 328-330 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A high-resolution electron microscopic (HREM) study of the interface structure between diamond film and its silicon substrate has been carried out. The HREM images reveal that there is an amorphous layer between diamond film and its substrate for a sample grown by the hot filament chemical vapor deposition. β-SiC crystallites are embedded in this amorphous layer. The HREM images of cross-sectional specimens reveal that the diamond crystallites can nucleate directly on either the intermediate amorphous layer, the β-SiC crystallites, or at some scratches of the Si substrate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.110060
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  • 10
    Electronic Resource
    Electronic Resource
    Paramagnetic resonance of platinum ions in PbTiO3 single crystals (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 62 (1993), S. 146-148 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Optical excitation of trivalent platinum (5d7, t6e) ions in lead titanate single crystals have been observed for the first time by electron paramagnetic resonance (EPR). The g and hyperfine coupling A tensors were found to be axial: g(parallel)=1.938, g⊥=2.478, A(parallel)=0.0164 cm−1, and A⊥=0.0324 cm−1. Analysis of the EPR spectra using crystal field theory indicates that the Pt+3 ions are in tetragonally distorted (elongated) octahedral sites, strongly suggesting that they substitute for the central Ti+4 ions in the perovskite lattice.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.109353
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