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Applied Physics Letters

Issue 7 • Date Apr 1972

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Displaying Results 1 - 19 of 19
  • Issue Table of Contents

    Page(s): toc1
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    Freely Available from IEEE
  • Effect of Proton Bombardment on Pb0.76Sn0.24Te

    Page(s): 235 - 237
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    Effects of 200–450‐keV proton bombardment on the electrical properties of Pb0.76Sn0.24Te were studied. p‐type samples of initial hole concentration in the low 1017/cm3 range were converted to n type after a proton dose of 5 × 1013 p/cm2. For samples of higher initial hole concentration, the conversion was less consistent. The change in mobility due to bombardment was found to be moderate. The mobilities of some p‐type samples were doubled after type conversion. View full abstract»

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  • Beam Effects in the Analysis of As‐Doped Silicon by Channeling Measurements

    Page(s): 237 - 239
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    Channeling‐effect measurements with MeV He ions have been used to study the lattice location of As in silicon. Over the concentration range studied (5 × 1019 - 1.2 × 1021/cm3) As was found to be 90–95% on substitutional sites. However, it was found that bombardment with the analysis beam caused 20–40% of the As to move off lattice sites. This effect may be responsible for the relatively low As substitutional fraction found in previous investigations. No bombardment‐induced off‐lattice movement was found in Sb‐doped Si indicating that this movement is species dependent. View full abstract»

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  • Optical Transmission in Liquid‐Core Quartz Fibers

    Page(s): 239 - 241
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    Multimode liquid‐core quartz fibers, potentially useful for long‐distance optical communication, have been constructed. The optical transmission loss of these fibers has been measured between 6000 and 11 000 Å. Fibers filled with tetrachloroethylene or a mixture of equal parts by volume of tetrachloroethylene and carbon tetrachloride have transmission loss of 20 dB/km or less between 8400 and 8600 Å and between 10 400 and 11 000 Å. These bands are of particular interest because within them operate highly promising oscillators such as the GaAs diode and the Nd: YAG laser. An absorption peak of 80 dB/km at 9600 Å is attributed to a small percentage of OH in the tetrachloroethylene. In the wavelength intervals between 7000 and 7600 Å and between 8200 and 11 000 Å these fibers have losses lower than or about equal to those reported for any other fibers. View full abstract»

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  • New Thin‐Film Tunnel Triode Using Amorphous Semiconductors

    Page(s): 241 - 243
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    A new thin‐film tunnel triode is discussed which uses a p‐type amorphous film to achieve amplification of injected current from a tunnel cathode. It is not only the basis for a new semiconductor device but also suggests a novel method for measuring electrical properties of semiconductors. View full abstract»

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  • CO Laser Action by C2H2 Oxidation

    Page(s): 243 - 244
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    Laser emission has been detected from CO molecules produced by the dc discharge‐initiated chemical oxidation of C2H2. The vibrational‐rotational transitions were P branch from v = 3:2 to v = 11:10 with J = 11-14, nominally. The explosive property of the oxidation reaction was verified. View full abstract»

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  • Bistable Switching in Metal‐Semiconductor Junctions

    Page(s): 244 - 245
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    Bistable switching with memory has been achieved in various n‐type GaAs Schottky contacts and n‐type Si Schottky contacts doped with trap impurities. Transition from the low‐conductivity state into a high‐conductivity state is established after a delay of 10 nsec, when a threshold voltage is exceeded. With opposite bias direction, resetting occurs in 10 nsec by exceeding a current threshold. Either state is maintained over weeks without bias. View full abstract»

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  • High‐Field Transport Properties of GaSb

    Page(s): 246 - 248
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    The recent availability of experimental data on the hot‐electron transfer in GaSb has stimulated the present theoretical work. In the past, the only comparison between hot‐electron transport theory and experiment has been through the velocity‐field characteristic or galvanic‐magnetic phenomena. Because of the insensitivities of these macroscopic characteristics to the value of the deformation potential for nonequivalent intervalley scattering, an exact value for the latter, which governs the electron transfer between central and satellite valleys, could not be obtained. A Monte Carlo calculation has been used to obtain the deformation potential for nonequivalent intervalley scattering by interpreting the experimental data on hot‐electron transfer in GaSb obtained using the Faraday rotation. View full abstract»

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  • Behavior of Phosphorous and Arsenic Diffused Simultaneously into Silicon Crystals

    Page(s): 248 - 249
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    Behavior of phosphorus and arsenic atoms diffused simultaneously into silicon crystals, in which the density of phosphorus at the surface is 1021 cm-3, was studied by random and aligned spectra of backscattered helium ions and radioactive analysis techniques. It was concluded that the phosphorus atoms enter substitutionally and arsenic atoms interstitially, indicating that interstitial atoms inhibit the generation of dislocations. View full abstract»

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  • The Use of Sm3 Co in Sintering SmCo5 Magnets

    Page(s): 250 - 251
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    The use of single phase Sm3Co as a sintering aid in the liquid‐phase sintering of SmCo5 has been investigated. The magnetic properties of this system were studied as a function of the sintering‐aid content and sintering time vs temperature. Using a modest alignment field of only 10 kOe, a magnet with an energy product of 17.0 MG Oe has been achieved. View full abstract»

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  • Behavior of a Deionized Liquid Crystal Subjected to Unipolar Injection in Nematic and Isotropic Phase

    Page(s): 251 - 253
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    Electrohydrodynamic phenomena in insulating MBBA subjected to unipolar injection of ionic carriers are described. Near the transition temperature, the transient currents following a voltage step were similar in the nematic and isotropic phases, over a wide range of voltages and electrode separations. High‐speed cinematography, Schlieren techniques, and the Kerr effect were resorted to in this investigation. Liquid motion was observed having a time lag and exhibited patterns closely similar to those previously observed in isotropic polar liquids. The velocities of hydrodynamic disturbances and of space‐charge fronts varied over a broad range, depending on experimental conditions. View full abstract»

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  • High‐Field Transport Properties of CdTe

    Page(s): 253 - 254
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    A Monte Carlo calculation has been used to calculate the high‐field transport properties of CdTe where the full complexity of the band structure has been taken into account. Comparison with experimental results yields basic transport parameters, e.g., deformation potential for nonequivalent intervalley scattering. View full abstract»

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  • Josephson Junctions with Nb/Al Composite Electrodes

    Page(s): 254 - 256
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    Josephson tunnel junctions have been fabricated incorporporating a thin layer of normal metal which is oxidized to form the tunnel barrier. The tunnel devices tested were of the form Nb/Al/Al2O3/Nb and several milliamperes of Josephson current were observed at 4.2°K. These samples have been found to have better defined tunneling characteristics than samples of the form Nb/NbOx/Nb. View full abstract»

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  • Relative Raman Cross Section for O3, CH4, C3H8, NO, N2O, and H2

    Page(s): 256 - 257
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    The relative Raman cross sections of gases which are of interest in air pollution studies have been measured at 5145 Å. These relative differential cross sections compared to that of N2 are as follows: O3 (4.0), CH4 (8.0), C3H8 (2.4, 5.8), NO (0.55), N2O (2.7, 0.53), and H2 (2.2). The absolute Raman cross section for N2 has been revised to be (4.4±1.7) × 10-31 cm2/sr at 5145 Å, for vertically polarized input and 90° scattered Raman radiation that is not analyzed for its polarization. View full abstract»

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  • Visible Cathodoluminescence of AgGaS2, a I‐III‐VI2 Chalcopyrite Compound

    Page(s): 257 - 259
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    The cathodoluminescence of AgGaS2, a I‐III‐VI2 ternary chalcopyrite compound, has been studied in the 2.1–2.8‐eV range at 300, 77, and 21 °K. At 300 and 77 °K the annihilation of free excitons is observed, while at 21 °K only extrinsic transitions appear. A study of the polarization shows that the excitonic lines are polarized E ‖ C. View full abstract»

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  • Observation of Film Growth Process by Means of Backscattering Technique

    Page(s): 259 - 261
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    Evaporated Sn layers on Si and sapphire substrates were used to demonstrate the applicability of the backscattering technique to measurement of the fraction of covered area, the average thickness of the layer, and the sticking factor for temperatures over the range 77–400 °K. The sticking factor at 293°K was found to be ⅓ of that at 77 and 393 °K, and 19% higher at room temperature (r.t.) for Sn on Sn as compared with Sn on Si. At 393 °K the fraction of covered area was found to be about 60% and the average island thickness was in the range 450–1000 Å. View full abstract»

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  • Fast‐Interface‐State Losses in Charge‐Coupled Devices

    Page(s): 261 - 263
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    A simple model which predicts the large signal losses in charge‐coupled devices due to fast‐interface‐state trapping is presented, and the predictions of the model are verified by experimental measurements of losses in two‐phase CCD's. View full abstract»

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  • Total Optical Attenuation in Bulk Fused Silica

    Page(s): 264 - 266
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    A survey has been made of optical attenuation in a series of commercially available silica, SiO2, samples to determine the suitability of this material for fiber optical communications. The absorptive component of the attenuation was measured by a precision calorimetric technique, while the scattering component was determined by a new method based on spontaneous Brillouin spectroscopy. Both techniques set an upper limit on the loss and are precise to within a fraction of 1 dB/km. Of the samples tested, the best has a total attenuation of less than 3 dB/km at the 1.06‐μ wavelength of the YAlG : Nd laser. View full abstract»

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  • Operation of a Ruby Laser in the Purely Transverse Electric Mode TE01

    Page(s): 266 - 267
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    A ruby laser has been operated in the circular TE01 mode by means of a novel mode selector. Construction, output characteristics, conversion into TM01, and possible applications are described. View full abstract»

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Aims & Scope

Applied Physics Letters, published by the American Institute of Physics, features concise, up-to-date reports on significant new findings in applied physics.

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Meet Our Editors

Editor
Nghi Q. Lam
Argonne National Laboratory