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  • Springer  (46)
  • Institute of Physics  (34)
  • National Academy of Sciences  (17)
  • American Institute of Physics (AIP)  (5)
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  • 1
    Electronic Resource
    Electronic Resource
    Lasing operation of chemical oxygen-iodine laser without water-vapor trap (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 1785-1786 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: cw laser action from chemically pumped iodine atoms was achieved without a cold trap to freeze water vapor. An alkaline solution of H2O2 was circulated in a porous pipe generator, which made it possible to cool the solution externally. A lasing operation time of about 100 s with a constant output power of 5 W was obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.339921
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  • 2
    Electronic Resource
    Electronic Resource
    High flux VUV beamline for photochemical processing study at Photon Factory (abstract) : INTERNATIONAL CONFERENCE ON SYNCHROTRON RADIATION INSTRUMENTATION TSUKABA (JAPAN) 29 AUG−2 SEPT 1988 (1989)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 60 (1989), S. 2252-2252 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Recent progress in photochemical processing involving photochemical etching and photochemical vapor deposition are really remarkable and such processes become the most promising candidates as a next-generation VLSI fabrication technology. Thus the study to elucidate the reaction mechanism of the photochemical processing is of both fundamental and technological importance. In order to promote this study, we have designed and constructed a new beamline at Photon Factory (BL 12C). It consists of three major parts; a prefocusing mirror, a multilayer mirror monochromator, and a differential pumping system. A Pt-coated SiC toroidal mirror (Rh:0.539 m, Rv:490 m) is installed in a prefocusing mirror chamber (18.3 m from the source), accepts 5.0-mrad horizontal and 1.0-mrad vertical divergence of the synchrotron radiation, reflects it 3.8° upward, and focuses it onto the middle of the exit arm of the monochromator (32.3 m from the source). A multilayer mirror, which was designed and fabricated by Yamamoto et al., so as to get high reflectance around 100 eV of photon energy (see the preceding paper), is installed in the monochromator, steers SR beam downward, and selects photon energy by changing an incident angle. With this arrangement, a quasimonochromatic and bright beam is obtained in the energy region 80–100 eV. The output flux is expected to be ∼1015 photons/s⋅10% bw with 200-mA ring current.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140785
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  • 3
    Electronic Resource
    Electronic Resource
    Angular distributions of photofragments generated in the two-photon dissociation of nitrogen dioxide and carbon disulfide (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 4425-4430 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Two-photon dissociation of nitrogen dioxide and carbon disulfide at 308 nm has been studied by means of multiphoton ionization of photofragments. The angular distributions of fragments are well represented by a form of 1+β2P2(cos θ)+β4P4(cos θ). Because the intermediate state of NO2 (2B2) generated by the first one-photon process is dissociative, the coefficient β4 for the fourth degree Legendre polynomial is appreciable. The coefficient β4 for CS2 is, however, not appreciable because the intermediate CS2 (1B2) state has a long fluorescence lifetime. The angular distributions not only reveal the symmetry and lifetimes of the two-photon excited states of NO2 and CS2 but also information on the two-photon excitation process of these molecules.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.452714
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  • 4
    Electronic Resource
    Electronic Resource
    Angular distributions of photofragments from NO2 photodissociation (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 4431-4437 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The angular distributions of recoil of NO molecules from the photodissociation of NO2 near the dissociation threshold of 397.86 nm are presented and analyzed to obtain information about the effect of molecular rotation of parent molecules on the angular distribution. For the one-photon dissociation process, as laser wavelengths become closer to the dissociation threshold, the anisotropy of the angular distribution is reduced. When laser wavelengths become larger than the threshold, NO2 dissociates via two-photon absorption, and the photofragment angular distribution again becomes anisotropic reflecting the second photon absorption.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.452715
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  • 5
    Electronic Resource
    Electronic Resource
    Further measurement of the 7Be(p,γ)8B cross section at low energies with the coulomb dissociation of 8B (1998)
    Springer
    The European physical journal 3 (1998), S. 213-215 
    Details
    ISSN: 1434-601X
    Keywords: PACS: 25.40.Lw Radiative capture – 35.60.-t Reactions induced by unstable nuclei – 25.70.De Coulomb excitation – 25.70.Mn Projectile and target fragmentation – 26.65.+t Solar neutrinos
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: We have measured the dissociation of 8B in the Coulomb field of 208Pb at Ein=51.9 MeV/nucleon and extracted the cross section of the 7Be(p,γ)8B reaction at 0.4 ≤ Erel≤ 3 MeV, which is of importance for the 8B solar-neutrino production rate. The extracted astrophysical S17 factors are consistent with our earlier Coulomb dissociation measurement, and agree with the values deduced from the direct capture measurements by Filippone et al., Vaughn et al. and Hammache et al. The S factor at zero energy was extracted to be 18.9±1.8 eV-b with the help of theoretical energy-dependence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100500050170
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  • 6
    Electronic Resource
    Electronic Resource
    Study of the life history of Capitella capitata (Polychaeta: Capitellidae) in Amakusa, South Japan including a comparison with other geographical regions (1984)
    Springer
    Marine biology 80 (1984), S. 315-321 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The life history of Capitella capitata (Fabricius), occurring in Amakusa, South Japan, was studied in detail through field investigations and laboratory experiments. The important life-history characteristics of this species in the present study area are described and compared with those reported in previous studies from various geographic regions. Though some life-history characteristics (extended breeding season throughout almost the whole year, parental brooding habit, and early maturation) are common to all localities, the reproductive mode, larval developmental pattern and morphology are very distinct among the worms from various localities. C. capitata showing these considerable geographical variations should not be treated as a single species. It is suggested that C. capitata, originally defined on the basis of morphological features of adult worms, needs to be subdivided into several species, subspecies, or biological races.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00392827
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  • 7
    Electronic Resource
    Electronic Resource
    Electric-field modulation measurements of complex electro-optic effects in poled polymer (1999)
    Springer
    Applied physics 68 (1999), S. 207-210 
    Details
    ISSN: 1432-0649
    Keywords: PACS: 42.65.Vh; 42.70.Jk; 78.20.Jq
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003400050607
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  • 8
    Electronic Resource
    Electronic Resource
    Vacuum fusion determination of micro-quantities of bulk gases in low carbon iron without an effect of surface gases (1985)
    Springer
    Microchimica acta 86 (1985), S. 347-356 
    Details
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Vacuum Fusion Determination of Micro-quantities of Bulk Gases in Low Carbon Iron Without an Effect of Surface Gases Micro-quantities of bulk and surface oxygen and hydrogen in low carbon iron was simultaneously determined by the surface-area-variation method using vacuum fusion analysis. Among the difference of three surface treatments, silicon carbide abrasive, electropolishing and hydrogen reduction methods, bulk oxygen and hydrogen were in agreement within their errors, however, surface oxygen and hydrogen were influenced from the surface treatments. Even in the case of electropolishing, which gave the smallest surface oxygen value, bulk oxygen less than 10μg/g is needed to discriminate from the surface oxygen. Bulk hydrogen of 0.03μg/g was determined without the effect of surface hydrogen in the hydrogen reduction treatment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01206905
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  • 9
    Electronic Resource
    Electronic Resource
    Vacuum fusion determination of oxygen in gadolinium, terbium metal and iron-terbium alloy (1986)
    Springer
    Microchimica acta 90 (1986), S. 215-224 
    Details
    ISSN: 1436-5073
    Keywords: oxygen determination ; vacuum fusion analysis ; inert gas fusion analysis ; gadolinium, terbium ; iron-terbium alloy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The extraction conditions for the accurate determination of oxygen in gadolinium, terbium and iron-terbium alloy using vacuum fusion analysis were studied. The influence of the gettering effect, the analyzing temperature and the weight ratio of the bath metal to the sample were investigated. Oxygen values of gadolinium and terbium were measured by the graphite crucible, the graphite capsule, the tin bath, the iron-tin bath and the platinum-tin bath techniques in the temperature range of 1500–2100 °C using vacuum fusion analysis. These oxygen values were compared with those obtained by inert gas fusion analysis. In inert gas fusion analysis, the samples were analyzed with iron and tin in a tin capsule, and the samples with platinum in a tin capsule were analyzed in a graphite capsule enclosing with carbon powder. Oxygen values of both metal samples in the graphite capsule at 2000 °C, with an iron-tin bath at 1850 °C and a platinum-tin bath at 2000 °C in vacuum fusion analysis, were respectively in good agreement within their errors; the oxygen values of gadolinium were also in good agreement with that from inert gas fusion analysis in the iron-tin bath, but those of terbium were not in agreement. This agreement for gadolinium guarantees the reliability of the conditions for the accurate determination, and the difference of oxygen values for terbium suggests a need for further consideration on the conditions of the inert gas fusion analysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01364302
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  • 10
    Electronic Resource
    Electronic Resource
    Simultaneous determination of nitrogen and oxygen in metals by vacuum fusion-quadrupole mass spectrometer (1981)
    Springer
    Microchimica acta 76 (1981), S. 163-173 
    Details
    ISSN: 1436-5073
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Zusammenfassung Aus Metallen werden mittels der Vakuum-Heiß-Extraktion Stickstoff und Kohlenmonoxid freigesetzt und simultan mit einem konventionellen Quadrupol-Massenspektrometer niedriger Auflösung (M/ΔM=56 beim/e=28) ohne Modifikation der Ionisationskammer bestimmt. Dadurch, daß keine Ionen-Beschleunigungsspannung angelegt wird, werden nur die Ionen mit überschüssiger kinetischer Energie erfaßt. Die Peak-Intensitäten von N+ und C+ stehen in doppelt logarithmischer Darstellung in linearer Beziehung zu der Menge Stickstoff und Kohlenstoff (innerhalb der Bereiche 0,05–600μg bzw. 0,1–600μg). Das N2/CO-Verhältnis muß zwischen 1/30 und 1 liegen. Bei Messung der Gas-Extraktionskurven mit einer Aufheizgeschwindigkeit von 20±5°C/min zeigen für die N+- und C+-Peaks charakteristische Muster. Die Methode eignet sich daher für das Studium von Extraktionsverhalten und -mechanismus von Nitriden und Oxiden und liefert Informationen über die Zersetzungstemperatur dieser Verbindungen und die Bindungsform von Stickstoff und Sauerstoff in Metallen. Die Extraktionskurven eines Pulvergemisches vonα-Si3N4 undα-Al2O3, eingeschlossen in einer Graphitkapsel, und verschiedener Eisenlegierungen wurden diskutiert.
    Notes: Summary Nitrogen and carbon monoxide extracted from metals are determined simultaneously by use of a combination of a vacuum-fusion furnace and a conventional low-resolution (m/Δ m=56 atm/e=28) quadrupole mass spectrometer without any modification in the ionization chamber. Only ions with excess of kinetic energy are detected at zero ion-accelerating voltage. The peak intensities of N+ and C+ give a linear log-log relationship to amount of nitrogen and carbon monoxide over the ranges 0.05–600 and 0.1–600μg respectively. The limiting ratios are 1/30〈N2/CO〈1. When the gas extraction curves are measured for a temperature gradient of 20±5°C/min, the N+ and C+ ion-peaks show characteristic patterns. The method is thus suitable for studying the extraction behaviour and mechanisms of nitrides and oxides and gives information about the decomposition temperature of these compounds and the state of nitrogen and oxygen in metals. The gas extraction curves for a mixed sample ofα-Si3N4 andα-Al2O3 powder enclosed in a graphite capsule and for various ferro-alloys, are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01197314
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