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  • Artikel  (16)
  • Artikel: DFG Deutsche Nationallizenzen  (16)
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  • Artikel: DFG Deutsche Nationallizenzen  (16)
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  • Springer  (16)
  • American Association for the Advancement of Science
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  • Physik  (16)
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  • 1
    Digitale Medien
    Digitale Medien
    Laser dye stability, part 10. Effects of DABCO on flashlamp pumping of coumarin dyes (1985)
    Springer
    Applied physics 37 (1985), S. 151-157 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 78,60 ; 61.8 ; 82.50
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract 1,4-Diazabicyclo[2.2.2]octane (DABCO) was tested as a flashlamp-pumped laser lifetime-extender with a variety of coumarin dyes and solvents under both air and argon. In a few cases, DABCO could be considered to have extended the lifetime as much as threefold; however, the selection of the appropriate cover gas and/or solvent could often yield a much greater improvement in the absence of DABCO. In general, DABCO was not found to be very valuable as a lifetime-extender. Furthermore, under some conditions DABCO was found to markedly reduce the laser lifetime and output.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00692078
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Experimental study of laser-induced thermal ignition in O2/O3 mixtures (1985)
    Springer
    Applied physics 37 (1985), S. 189-195 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 82.50 ; 42.60
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract O2/O3 mixtures are ignited by absorption of laser pulses of a TEA CO2 laser along the axis of a cylindrical cell. The dependence of the radial propagation of the O3 decomposition, detected by uv absorption of the ozone, on laser fluence and on O3 concentration is investigated. Oscillations of the signals are identified to be the first radial acoustic mode of the cell. For mixtures of 0.35 bar and 0.70 bar total pressure and O3 percentages within 20–50%, the ignition limit is in the order of 0.1–0.2 J/cm3 (absorbed energy density). These values are in reasonable agreement with the results of the corresponding numerical simulations.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00692940
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  • 3
    Digitale Medien
    Digitale Medien
    Carbon-13 separation by IRMPD of trifluoromethane-d0 and -d1 (1985)
    Springer
    Applied physics 36 (1985), S. 111-113 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 82.50
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Carbon-13 isotope selectivities and specific decomposition yields in the infrared multiple-photon decomposition of CHF3 and CDF3 were examined as a function of wave number using a CO2 TEA laser. The observed maximum selectivities were 30 for CHF3 and 55 for CDF3. The specific decomposition yields in CDF3 were considerably larger than those in CHF3.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00694697
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  • 4
    Digitale Medien
    Digitale Medien
    Observation of OH angular momentum polarization produced by H+O2 at 2.6 eV collision energy (1985)
    Springer
    Applied physics 36 (1985), S. 203-206 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 82.30 ; 82.50
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The OH rotational polarization produced by the reaction of fast H atoms from the polarized 193 nm photolysis of HBr with O2 (2.6 eV collision energy) has been measured by laser-induced fluorescence using polarized analysis light. A strong rotational polarization parallel to the electric vector of the dissociation laser and perpendicular to the flight direction of the H atoms is observed. Implications for the H+O2 reaction dynamics at high collision energies are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00704575
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  • 5
    Digitale Medien
    Digitale Medien
    Laser enrichment of carbon-14 (1985)
    Springer
    Applied physics 37 (1985), S. 79-86 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 82.50
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract An experimental study has been performed of the carbon-14 enrichment achievable in the ultraviolet laser dissociation of mixtures of14CH2O and12CH2O. The14C:12C enrichment factor in the CO product has been measured at 352.2 nm as a function of laser linewidth, formaldehyde temperature and pressure, and degree of carbon-14 depletion. The enrichment decreases with an increase in each of these parameters; the highest enrichment, 1190, was measured at 0.02 cm−1, 303 K, 1 Torr and a14C depletion of 10%. The results are assessed in terms of their application to radiocarbon dating, in particular for groundwater dating required for nuclear waste disposal, and to the enrichment of14C operating wastes extracted from nuclear reactors to a level suitable for commercial sale.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00692553
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  • 6
    Digitale Medien
    Digitale Medien
    Lead films produced by laser vapor deposition (1985)
    Springer
    Applied physics 37 (1985), S. 63-65 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 82.65 ; 82.50
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The deposition of lead film on quartz substrates by photolysing tetraethyl lead vapor with a laser is reported. The dependence of the deposition rate on the pressure of tetraethyl lead, on the light intensity and on the pressure of the buffer gas is measured. Deposition phenomena at low light intensity are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00691694
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  • 7
    Digitale Medien
    Digitale Medien
    Effect of flashlamp diameter on luminescent coolants for a solid-state laser (1985)
    Springer
    Applied physics 37 (1985), S. 31-34 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 78.60 ; 61.8 ; 82.50
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Reducing the diameter of the flashlamp was found to increase the percent improvement in output of a solid-state laser caused by using luminescent coolants. However, this change in diameter also reduced the effectiveness of the flashlamp in producing long (150 μs) laser pulses so that an overall decrease in laser output was observed. In the formation of short (40 μs) laser pulses, on the other hand, larger absolute values were obtained using the smaller diameter flashlamp.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00691689
    Standort Signatur Erwartet Verfügbarkeit
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  • 8
    Digitale Medien
    Digitale Medien
    Highly selective and efficient multiphoton dissociation of polyatomic molecules in multiple-frequency IR-laser fields (1985)
    Springer
    Applied physics 36 (1985), S. 93-103 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 82.50 ; 33
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract An ir multiphoton dissociation (MPD) process in multiple-frequency ir-laser fields has been experimentally realized. A selectivity ofS=104 was obtained in separating13C/12C isotopes upon multiple-frequency ir multiphoton dissociation (MFMPD) of the CF2HCl molecule, the dissociation yield13β for the13CF2HCl molecule amounting to around 1%. A yield of13β was reached at a selectivity ofS=102, and the total laser fluence required for the process was reduced. A new mechanism—“sticking” of molecules on the lower discrete vibrational levels—responsible for the low MPD yields observed for some molecules is discussed and a technique to eliminate it and thus maximize the dissociation yields is proposed. Ways to improve the selectivity by MFMPD are analyzed and a simple method for obtaining from a single TEA CO2 laser a multiple-frequency radiation suitable for experimental realization of MFMPD is suggested.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00694695
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  • 9
    Digitale Medien
    Digitale Medien
    Laser-induced reactions of NO2 in the visible region (1985)
    Springer
    Applied physics 38 (1985), S. 219-224 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 82.30 ; 82.50
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The reaction of NO2 with isobutane, induced by 488 nm laser radiation, to form 2-nitro-2-methylpropane has been investigated and the results computer-modeled according to two possible reaction mechanisms. The first scheme involves the direct abstraction of H from isobutane by vibronically excited NO2 (NO 2 *Δ ), and the second, abstraction by an intermediate NO3 radial produced by NO 2 *Δ +NO2. The modeling results strongly support the NO 2 *Δ scheme as the dominant reaction mechanism.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00818047
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  • 10
    Digitale Medien
    Digitale Medien
    Laser isotope separation of tritium using CF3CTBrF/CF3CHBrF (1985)
    Springer
    Applied physics 37 (1985), S. 67-72 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 82.50 ; 82.40 ; 42.60
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract A new working molecule 2-bromo-1,1,1,2-tetrafluoroethane is reported for laser isotope separation of tritium. The multiphoton dissociation rate of CF3CTBrF is studied as a function of irradiation wavenumber, using a CO2 or NH3 laser. In a tightly focused irradiation geometry where the dissociation saturates both for CF3CTBrF and CF3CHBrF, their threshold fluences of dissociation and the geometrically biased selectivity are measured near the maximum of the dissociation rate of CF3CTBrF. When the irradiation geometry is optimized, a high selectivity exceeding 2700 is obtained.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00692551
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