CaRLO — Cancer Research Library Online

1

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Cryogenically cooled multiple-substrate holder for high vacuum (1994)

Chaiken, A. ; Honea, E. C. ; Rupprecht, W. S. ; [et al.]

[S.l.] : American Institute of Physics (AIP)

Review of Scientific Instruments 65 (1994), S. 3870-3870

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ISSN: 1089-7623

Source: AIP Digital Archive

Topics: Physics , Electrical Engineering, Measurement and Control Technology

Notes: A novel design is presented for a cryogenically cooled multisubstrate sample holder for thin film deposition in high vacuum. The cryogen flows through tubing soldered onto a fixed copper plate, while the substrates are mounted on a separate tray that is supported by a linear/rotary-motion feedthrough. By lowering the substrate tray into firm contact with the copper plate, substrate temperatures as low as 120 K can be achieved. © 1994 American Institute of Physics.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.1145184

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2

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Computer models of wall–sensor interactions in measurements using zero-balance heat-flux meters (1994)

Poloniecki, José Gabriel ; Grignon, Michel ; Saïdi, Azouaou

[S.l.] : American Institute of Physics (AIP)

Review of Scientific Instruments 65 (1994), S. 981-987

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ISSN: 1089-7623

Source: AIP Digital Archive

Topics: Physics , Electrical Engineering, Measurement and Control Technology

Notes: The principles of the zero-balance heat-flux meter (HFM) technique are studied with two steady-state finite difference computer models developed to simulate the responses of a sensor mounted either on the cold face or on the warm face of a wall. Computations show that a particular Biot number (defined by the authors), the dimensionless wall width, and the dimensionless wall thickness are the parameters affecting the HFM accuracy. The authors present outputs of their models that show the influence of these parameters, and propose three empirical expressions that allow corrections of the operational errors. It can be affirmed that the flux meter should be mounted on the cold face in the case of a small Biot number (it assures an accuracy of at least 5% if the Biot number value is smaller than 0.2). And it should be mounted on the warm face when the Biot number is large (in the case of building insulators in normal environment conditions it assures an accuracy of at least 10%). In other cases, the flux meter should be used as a gradient flux meter switching off the internal heater.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.1144876

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3

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Compact, combined scanning tunneling/force microscope (1992)

Anselmetti, D. ; Gerber, Ch. ; Michel, B. ; [et al.]

[S.l.] : American Institute of Physics (AIP)

Review of Scientific Instruments 63 (1992), S. 3003-3006

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ISSN: 1089-7623

Source: AIP Digital Archive

Topics: Physics , Electrical Engineering, Measurement and Control Technology

Notes: We have built a combined scanning tunneling and scanning force microscope. Owing to the compact design of the instrument with Nomarski type of interferometry for lever deflection sensing, we achieved excellent stability with a total rms noise of 0.03–0.04 A(ring) in a frequency bandwidth of 0.01 Hz–2 kHz and a spectral noise density of 2.0×10−4 A(ring)/ (square root of)Hz at higher frequencies ((approximately-greater-than)2 kHz) using cantilevers with compliances of ∼150 N m−1. Simultaneous measurement of constant current contours, the acting forces, and the system compliance allows separation of sample topography from electronic and elastic effects.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.1142600

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4

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The superalgebra embedding of OSP(1||2) in SL(1||2) and the grade star representations of SL(1||2) (1994)

Daumens, Michel

College Park, Md. : American Institute of Physics (AIP)

Journal of Mathematical Physics 35 (1994), S. 3650-3658

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ISSN: 1089-7658

Source: AIP Digital Archive

Topics: Mathematics , Physics

Notes: First, it is shown that the superalgebra embedding of osp(1||2) in sl(1||2) allows to characterize the irreducible representation states of sl(1||2) without any missing label. Through this embedding the general nonpositive definite scalar product in the osp(1||2) representation space can be generalized to the sl(1||2) representation space. Then grade star representations of sl(1||2) are derived by considering this nonpositive scalar product.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.530438

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5

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Boson fermion realizations for the super-rotation algebra (1994)

Daumens, Michel

College Park, Md. : American Institute of Physics (AIP)

Journal of Mathematical Physics 35 (1994), S. 986-992

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ISSN: 1089-7658

Source: AIP Digital Archive

Topics: Mathematics , Physics

Notes: The dispin realization of the super-rotation, in terms of two fermion pairs of creation and annihilation operators is presented. A short review of other fermion boson realizations of this algebra is given as well as their correspondence with differential operator realizations.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.530625

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6

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Hidden symmetries of two-dimensional systems with local degeneracies (1992)

Mayrand, Michel ; Vinet, Luc

College Park, Md. : American Institute of Physics (AIP)

Journal of Mathematical Physics 33 (1992), S. 203-212

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ISSN: 1089-7658

Source: AIP Digital Archive

Topics: Mathematics , Physics

Notes: The energy spectrum of a nonrelativistic particle in radial potentials of the form V(r) = αr 2d−2 − βr d−2 shows one level with a singularly high multiplicity. The two-dimensional problems are focused upon and the constants of motion that generate the symmetries responsible for this local accidental degeneracy are determined. The conserved operators realize an SU(2) algebra and the bound states are seen to fall into either finite, semibounded, or unbounded representations of this algebra. An SO(3,2) module encompassing the eigenstates associated to the whole set of potentials is also identified. It is further shown that there exists a second coordinate system besides the polar one in which the Schrödinger equation separates. Finally, it is indicated how the two-dimensional Coulomb and harmonic oscillator problems arise as special cases.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.529946

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7

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Noncommutative differential geometry of matrix algebras (1990)

Dubois-Violette, Michel ; Kerner, Richard ; Madore, John

College Park, Md. : American Institute of Physics (AIP)

Journal of Mathematical Physics 31 (1990), S. 316-322

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ISSN: 1089-7658

Source: AIP Digital Archive

Topics: Mathematics , Physics

Notes: The noncommutative differential geometry of the algebra Mn (C) of complex n×n matrices is investigated. The role of the algebra of differential forms is played by the graded differential algebra C(sl(n,C),Mn (C))=Mn (C)⊗Λsl(n,C)*,sl(n,C) acting by inner derivations on Mn (C). A canonical symplectic structure is exhibited for Mn (C) for which the Poisson bracket is, to within a factor i, the commutator. Also, a canonical Riemannian structure is described for Mn (C). Finally, the analog of the Maxwell potential is constructed and it is pointed out that there is a potential with a vanishing curvature that is not a pure gauge.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.528916

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8

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Intersubband hole absorption in GaAs-GaInP quantum wells grown by gas source molecular beam epitaxy (1994)

Brown, G. J. ; Hegde, S. M. ; Hoff, J. ; [et al.]

Woodbury, NY : American Institute of Physics (AIP)

Applied Physics Letters 65 (1994), S. 1130-1132

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ISSN: 1077-3118

Source: AIP Digital Archive

Topics: Physics

Notes: P-doped GaAs-GaInP quantum wells have been grown on GaAs substrate by gas source molecular beam epitaxy. Structural quality has been evidenced by x-ray diffraction. A narrow low-temperature photoluminescence full width at half-maximum has been measured. Strong hole intersubband absorption has been observed at 9 μm, and its dependence on light polarization has been investigated.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.112119

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9

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Velocity selection of fast laser ablated aluminum atoms by temporally and spatially specific photoionization (1994)

Macler, Michel ; Fajardo, Mario E.

Woodbury, NY : American Institute of Physics (AIP)

Applied Physics Letters 65 (1994), S. 2275-2277

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ISSN: 1077-3118

Source: AIP Digital Archive

Topics: Physics

Notes: The successful demonstration of velocity selection of fast aluminum atoms by a novel, nonmechanical technique is reported. Pulses of atoms with broad velocity distributions are produced by laser ablation of aluminum metal. A second pulsed laser, delayed by ∼1 μs and crossed at a right angle to the atomic beam, is used to photoionize only those atoms with unwanted velocities, i.e., atoms moving too fast or too slow to be hidden behind an opaque mask placed ∼1 cm from the ablated surface. The photoions are subsequently deflected from the beam by a static magnetic field. Velocity selected Al atom fluxes equivalent to Φ∼1011 atoms/(cm2 eV pulse) at a working distance of 10 cm are demonstrated. © 1994 American Institute of Physics.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.112716

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10

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Semiconductor characterization with the scanning surface harmonic microscope (1994)

Bourgoin, J.-P. ; Johnson, M. B. ; Michel, B.

Woodbury, NY : American Institute of Physics (AIP)

Applied Physics Letters 65 (1994), S. 2045-2047

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ISSN: 1077-3118

Source: AIP Digital Archive

Topics: Physics

Notes: The scanning surface harmonic microscope, in which a microwave signal is applied across a tip-sample tunneling gap and higher harmonics are detected, is sensitive to the capacitance/voltage characteristics of semiconductor samples on a nanometer scale. We demonstrate its sensitivity to a wide range of dopant concentrations on Si, and its applications as a dopant profiler. Depletion regions are delineated with remarkable sensitivity, and variations in dopant concentration over a 35-nm scale are discussed. Indications of a 5 nm resolution have been obtained. © 1994 American Institute of Physics.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.112788

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