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  • 1
    Digitale Medien
    Digitale Medien
    Performance characteristics of a high-pressure pulsed singlet oxygen generator (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 5760-5767 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The characteristics of a high-pressure pulsed singlet oxygen generator is investigated. This generator was designed for the energy source of new pulsed chemical lasers. A ceramic porous pipe is devised in it to attain the high-pressure pulsed operation. New methods were developed to measure a water vapor pressure and a reaction efficiency in the pulsed singlet oxygen generator system. The maximum singlet oxygen pressure obtained was 35 Torr, and the estimated initial excitation efficiency was 70%–80%
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.350469
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  • 2
    Digitale Medien
    Digitale Medien
    Development of a fluorescent x-ray source for medical imaging : 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. 1981-1983 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: A fluorescent x-ray source for medical imaging, such as K-edge subtraction angiography and monochromatic x-ray CT, has been developed. Using a 6.5 GeV accumulation ring in Tsukuba, fluorescent x rays, which range from about 30 to 70 keV are generated by irradiating several target materials. Measurements have been made of output intensities and energy spectra for different target angles and extraction angles. The intensities of fluorescent x rays at a 30 mA beam current are on the order of 1–3×106 photons/mm2/s at 30 cm from the local spot where the incident beam is collimated to 1 mm2. A phantom which contains three different contrast media (iodine, barium, gadolinium) was used for the K-edge energy subtraction, and element selective CT images were obtained. © 1995 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1145776
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  • 3
    Digitale Medien
    Digitale Medien
    Charged particle densities and kinetics in a radio-frequency SF6 plasma (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 7221-7230 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Electron, negative ion, and positive ion densities in a capacitively-coupled radio-frequency (rf, 13.56 MHz) SF6 plasma have been investigated as functions of the pressure (30–700 mTorr) and rf power. The decay of the charged particle densities in the afterglow has also been studied to obtain information about their kinetics. The electron density was determined by using a microwave cavity resonance technique. Negative ions were detected by measuring the density of photodetached electrons produced by pulsed laser irradiation of the plasma. The positive ion density was obtained from Langmuir probe measurements. At a rf power of 0.13 W/cm2 and at low pressures ((approximately-less-than)100 mTorr) the positive ion density, which is virtually equal to the negative ion density, is found to be larger than the electron density by a factor of a few hundred; the ion/electron density ratio increases with increasing pressure to reach a value of a few thousand at high pressures. Wavelength-dependent photodetachment measurements indicate that the dominant contribution to the photodetachment signal at 266 nm comes from F−, but F− is a minor negative-ion species with respect to the density; that is, the photodetachment efficiency for the dominant negative ion species (supposed to be SF−5) is low. The recombination rate constant for F− (supposedly with SF+5) is suggested to be an order of magnitude larger than that for the dominant ion species, the latter being estimated to be slightly smaller than 10−7 cm3 s−1. © 1994 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.358003
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  • 4
    Digitale Medien
    Digitale Medien
    Efficient operation of a chemically pumped oxygen iodine laser utilizing dilute hydrogen peroxide (1987)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 51 (1987), S. 1490-1492 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: A chemically pumped oxygen iodine laser system has been operated employing 35 wt. % H2O2 rather than commonly used 90 wt. % H2O2. Laser power as high as 40 W has been extracted. The maimum overall efficiency of 20.7%, which is almost 25% higher than the previously reported best data, has been achieved.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.98664
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  • 5
    Digitale Medien
    Digitale Medien
    Chemical oxygen iodine laser of extremely high efficiency (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 65 (1989), S. 870-872 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We have developed a highly efficient chemical oxygen iodine laser with industrial uses in mind. A maximum overall efficiency of 40% has been achieved at a power level of 200 W. This efficiency makes the running cost of the iodine laser comparable to that of typical yttrium-aluminum-garnet lasers. The key issues for achieving high efficiency are discussed. Using the present system, we were successful in drilling a 1-mm-thick steel plate at a power level of 60 W, which we believe is the first demonstration of material processing by a chemical oxygen iodine laser.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.343423
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  • 6
    Digitale Medien
    Digitale Medien
    Effect of uniaxial stress on the Raman spectra of graphite fibers (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 2769-2772 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Measurements of the effect of uniaxial stress on the frequency of the k≈0 optical phonons in heat-treated benzene-derived graphite fibers have been performed using first-order Raman scattering. Application of uniaxial stress along the fiber axis is found to cause polarization-dependent splittings and shifts of the Raman peaks of the k≈0 doubly degenerate optical phonons. From these observed splittings and shifts, experimental values for the phenomenological coefficients which describe the changes in the elastic constant of these phonons with strain are determined. It is concluded that Raman spectroscopy can be used to characterize the local stress or strain conditions of graphite fibers nondestructively.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.340975
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  • 7
    Digitale Medien
    Digitale Medien
    Chemically pumped atomic iodine pulse laser (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 59 (1991), S. 891-892 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: A pulsed iodine laser driven by a chemical oxygen generator was developed. The energy deposition on I(2P3/2) was made by a high-pressure pulsed O2(a1Δg) generator. Although this scheme is the same as the conventional chemically pumped oxygen-iodine laser (COIL), it is unique in that the pulsed laser was extracted by the high-energy density pulsed pumping scheme. The pulse energy obtained was 1.34 J, the pulse width was 1.5 ms, and the peak power was 900 W. The specific energy was estimated to be 3.6 J/l.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.105267
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  • 8
    Digitale Medien
    Digitale Medien
    Magnetic alignment of mesophase pitch-based carbon fibers (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 69 (1996), S. 430-432 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Mesophase pitch-based carbon fibers (MPCFs) have recently been developed for use as high performance anode materials in Li ion secondary batteries, having a microscopic as well as macroscopic structure especially suitable for Li storage. Because of the highly anisotropic diamagnetic moment observed between 50 and 310 K in pristine milled MPCF segments, they can easily be oriented parallel to an applied magnetic field, as observed by scanning electron microscopy. A simple model is proposed to explain both the observed alignment of undoped fibers and the suppression of alignment in B-doped MPCFs for relatively small applied magnetic fields, because of their smaller diamagnetic moment. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.118084
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  • 9
    Digitale Medien
    Digitale Medien
    Raman spectra of polyparaphenylene-based carbon prepared at low heat-treatment temperatures (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 68 (1996), S. 1078-1080 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Raman spectroscopy was used to characterize the structural development of polyparaphenylene (PPP) based carbon at various heat treatment temperatures (THT), with an emphasis on the low THT regime. Experimental data show that PPP-based carbons undergo a smooth transiiton from a mostly PPP polymer-type structure for heat treatments below ∼750 °C to a graphitized structure at a heat treatment temperature of 2700 °C. These results give insight into the unusually high specific capacities observed in lithium-PPP systems which are of particular interest for application to Li ion battery technology. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.115718
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  • 10
    Digitale Medien
    Digitale Medien
    Electron spin resonance of polyparaphenylene-based carbons (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 69 (1996), S. 2042-2044 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We report electron spin resonance (ESR) results on heat-treated polyparaphenylene (PPP) over the heat-treatment temperature (THT) range of 650–2900 °C. Two distinct spin centers are identified corresponding to a broad (∼5 G) ESR peak below THT=750 °C and a narrow (∼0.5 G) ESR peak above THT=650 °C. ESR peaks from both spin centers are observable for THT=700 °C, a material of particular interest for device applications. T1 and T2, the spin-lattice and spin-spin relaxation times, respectively, are estimated for both spin centers, and these results are discussed in relation to previously reported Raman spectroscopy and magnetic susceptibility measurements. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.116873
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