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  • 11
    Electronic Resource
    Electronic Resource
    GaAs asymmetrically doped n-i-p-i- superlattices for 10 μm infrared subband detector and modulator applications (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 4407-4412 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A theoretical framework for the design of asymmetrically doped n-type n-i-p-i- superlattices for subband detector applications in the 10 μm spectral range is described. Excellent agreement is found with the subband absorption spectra measured in a series of GaAs n-type n-i-p-i- samples and oscillator strengths, transition energies, and dipole matrix elements comparable with conventional quantum-well heterostructure detectors are found. Pronounced IR-absorption modulation by optical pumping with band-gap radiation is seen, due to the enhanced interband recombination time resulting from the type-II n-i-p-i- potential. The prospective advantages of n-type n-i-p-i- devices for the detection and modulation of 10 μm radiation are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.357334
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  • 12
    Electronic Resource
    Electronic Resource
    Film quality in relation to deposition conditions of a-SI:H films deposited by the "hot wire'' method using highly diluted silane (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 7278-7292 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The deposition parameter space has been extensively explored using the hot wire technique with 1% SiH4 in He as a source gas. To achieve reasonable deposition rates despite the high dilution, the filament was positioned at 1–2 cm from the substrate. This short distance introduced a large nonuniformity across the substrate in deposition rate as well as in film properties. These spatial variations were used to analyze which factors in the deposition determine film quality. Radiation from the filament as well as deposition rate cannot explain the large variation in film properties, leaving gas-phase reactions of Si and H from the hot filament as the primary cause. It is clear that radicals evaporated from the filament must undergo gas-phase reactions with SiH4 before deposition in order to produce high-quality material. Thus, conditions such as increasing the chamber pressure or going to a heavier carrier gas increase the fraction of radicals that can react before reaching the substrate and, therefore, improve the film quality. However, such conditions also enhance multiple radical reactions before such radicals reach the substrate and this can have a negative effect on film quality: this is attributed to gas-phase nucleation with incorporation of conglomerates. The gas-phase chemistry is quite different from that of plasma-enhanced decomposition in that no disilane or trisilane is formed in significant quantities. This, and the dependence on pressure, indicates that the pathway for formation of these heavier particles is radical–radical reactions. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361445
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  • 13
    Electronic Resource
    Electronic Resource
    Soft x-ray magneto-optical Kerr effect (invited) (abstract) : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 5810-5810 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Recently, there has been a great deal of interest in x-ray magnetic circular dichroism (MCD) and its applications to the study of magnetic thin films and multilayers due to the dramatically enhanced dichroic effect and its element specific nature. In this work, the soft x-ray magneto-optical Kerr effect, an effect closely related to MCD, is investigated. Detailed comparison between MCD and the Kerr effect is discussed. As an example, recent results from a thin bcc Co film will be presented. In the Kerr effect measurement, specular reflectivity as a function of incident angle and photon energy was measured using both linearly polarized and circularly polarized x rays. To give the largest effect, in the case of linearly polarized light, specular reflectivity was measured in the transverse configuration, while in the case of circularly polarized light, the measurement was carried out in the longitudinal configuration. In both cases very large changes in reflectivity, up to 40% in the linearly polarized case and 75% in the circularly polarized case, were observed near the Co LII and LIII absorption edges upon reversal of the direction of the magnetic field. These results agree very well with a macroscopic model calculation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355575
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  • 14
    Electronic Resource
    Electronic Resource
    Microcomputer-controlled reagent preparation system (1981)
    s.l. : American Chemical Society
    Analytical chemistry 53 (1981), S. 1484-1487 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac00232a043
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  • 15
    Electronic Resource
    Electronic Resource
    No phospholipid monolayer-sugar interactions (1986)
    s.l. : American Chemical Society
    Biochemistry 25 (1986), S. 5239-5242 
    Details
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/bi00366a038
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  • 16
    Electronic Resource
    Electronic Resource
    Nimodipine in migraine prophylaxis (1988)
    USA/Oxford, UK : Blackwell Science Ltd
    Cephalalgia 8 (1988), S. 0 
    Details
    ISSN: 1468-2982
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Nimodipine is a compound that is thought to block the influx of calcium through channels in vascular smooth muscle. This paper describes a double-blind parallel-group comparison of 40 mg nimodipine three times a day and placebo. Sixty-eight patients received treatment after a run-in period of 2 months, and of these, 57 completed 8 weeks or more of the trial. All but five of these completed the full 6-month trial. The nimodipine and placebo groups showed no significant differences in the frequency of attacks. severity or duration of headache, or gastrointestinal or other symptoms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1468-2982.1988.0804269.x
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  • 17
    Electronic Resource
    Electronic Resource
    Bacterial Conjugation and Extrachromosomal Elements (1967)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Genetics 1 (1967), S. 87-116 
    Details
    ISSN: 0066-4197
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.ge.01.120167.000511
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  • 18
    Electronic Resource
    Electronic Resource
    Technique for impedance matching at two ultrasonic frequencies simultaneously (1988)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 59 (1988), S. 188-189 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Situations arise where it would be advantageous if ultrasonic measurements could be performed at two distinct frequencies simultaneously. Such a scheme is hampered by the need for a method whereby the sample impedance at both frequencies can be matched to that of the driver electronics. Such a method is presented in this note.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140007
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  • 19
    Electronic Resource
    Electronic Resource
    X-ray resonant magnetic scattering ellipsometer : The 9th National conference on synchrotron radiation instrumentation (1996)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 67 (1996), S. 3363-3364 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: It is very difficult to characterize the polarization of a synchrotron radiation source in the soft and/or intermediate x-ray energy region particularly from 1 to 2 keV. Conventional multilayer mirror or single-crystal polarimeters do not work over this energy region because their throughput (the reflectivities combined with the phase shift) becomes insignificant. In this paper, we present a new ellipsometer scheme that is able to fully characterize the polarization of synchrotron radiation sources in this energy region. It is based on the dichroic x-ray resonant ferromagnetic scattering that yields information on both the polarization of the x-ray and the material (element specific) dielectric-constant tensor [C.-C. Kao et al., Phys. Rev. B 50, 9599 (1994)] due to the interband ferromagnetic Kerr effect [B.R. Cooper, Phys. Rev. A 139, 1504 (1965)]. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1147472
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  • 20
    Electronic Resource
    Electronic Resource
    X13A: A versatile soft x-ray undulator beamline : Proceedings of the 5th international conference on synchrotron radiation instrumentation (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 1827-1829 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The undulator based beamline X13A at the National Synchrotron Light Source has been commissioned recently. The X13 undulator has an 8 cm period, and its first harmonic is in the energy range of 200–700 eV at the nominal ring energy of 2.5 GeV. The beamline uses horizontally deflecting optics. It consists of a SiC plane mirror, a water cooled entrance slit, a spherical grating, and two fixed exit slits. A flux of more than 1012 photons/s at 450 eV has been measured at X13A with an aluminum-oxide photodiode with a 200 μm entrance slit, a 500 μm exit slit, and a ring current of 242 mA. A VF3 absorption spectrum recorded at X13A shows the monochromator resolving power is at least 1000 at ∼500 eV with 30 μm entrance and exit slits, in agreement with calculations. The X13A beamline will be used for x-ray coherence studies, spectroscopy, and multilayer reflectivity measurements as well as for x-ray instrumentation diagnostics. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1146461
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