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  • Articles  (64)
  • Articles: DFG German National Licenses  (64)
  • 82.50  (64)
  • 1985-1989  (64)
  • 1940-1944
  • Physics  (64)
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  • Articles  (64)
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  • Articles: DFG German National Licenses  (64)
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  • 1
    Electronic Resource
    Electronic Resource
    Photophysical properties and laser performance of photostable UV laser dyes (1988)
    Springer
    Applied physics 45 (1988), S. 279-284 
    Details
    ISSN: 1432-0649
    Keywords: 07.65 ; 33 ; 42.55 ; 82.50
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The photophysical properties such as singlet absorption and fluorescence spectra, the fluorescence quantum yield and fluorescence decay time as well as the laser performance data such as the tuning range, the conversion efficiency, and the photochemical stability of 12 sterically hinderedp-quaterphenyls have been measured in ethanol and/or dioxane at room temperature. The sterically hinderedp-quaterphenyls exhibit shorter laser dye emissions in the 330–380 nm range than the parent compoundp-quaterphenyl. The conversion efficiencies of the sterically hinderedp-quaterphenyls range between 1 and 21%. The photochemical stability of the sterically hinderedp-quaterphenyls is by a factor of 10 to 20 better in dioxane than in ethanol. 2-Methyl-5-tert. butyl-p-quaterphenyl and 2,5,2‴,5‴-tetramethyl-p-quaterphenyl are among the most stable UV laser dyes known today.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00687157
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  • 2
    Electronic Resource
    Electronic Resource
    CO2 laser ablative etching of polyethylene terephthalate (1989)
    Springer
    Applied physics 48 (1989), S. 489-493 
    Details
    ISSN: 1432-0649
    Keywords: 82.50 ; 42.60
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Films of polyethylene terephthalate (PET) can be successfully etched with 9 μm radiation from a pulsed TEA CO2 laser. The relationship between etch depth and fluence is broadly similar to that observed for excimer laser etching but with a less well-defined threshold. Time-resolved photoacoustic measurements of stress waves generated in the interaction show that at a fluence of 1.8 J cm−2 ablation occurs 100–200 ns after the start of the laser pulse, a time which is consistent with the rate of thermal decomposition of PET. The volatile products of ablation are carbon monoxide, carbon dioxide, methane, ethyne, ethene, benzene, ethanal, and small quantities of other products. For fluences close to and appreciably above the threshold the ablated material consists predominantly of involatile species of relatively high molecular weight, whereas at higher fluences substantial fragmentation of the polymer to small molecules occurs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00694685
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  • 3
    Electronic Resource
    Electronic Resource
    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
    Keywords: 78,60 ; 61.8 ; 82.50
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00692078
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  • 4
    Electronic Resource
    Electronic Resource
    Experimental study of laser-induced thermal ignition in O2/O3 mixtures (1985)
    Springer
    Applied physics 37 (1985), S. 189-195 
    Details
    ISSN: 1432-0649
    Keywords: 82.50 ; 42.60
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00692940
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  • 5
    Electronic Resource
    Electronic Resource
    Carbon-13 separation by IRMPD of trifluoromethane-d0 and -d1 (1985)
    Springer
    Applied physics 36 (1985), S. 111-113 
    Details
    ISSN: 1432-0649
    Keywords: 82.50
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00694697
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  • 6
    Electronic Resource
    Electronic Resource
    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
    Keywords: 82.30 ; 82.50
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00704575
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  • 7
    Electronic Resource
    Electronic Resource
    Laser enrichment of carbon-14 (1985)
    Springer
    Applied physics 37 (1985), S. 79-86 
    Details
    ISSN: 1432-0649
    Keywords: 82.50
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00692553
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  • 8
    Electronic Resource
    Electronic Resource
    Selective ir laser chemistry of CDF3 in natural fluoroform (1986)
    Springer
    Applied physics 39 (1986), S. 187-190 
    Details
    ISSN: 1432-0649
    Keywords: 82.50 ; 33
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Selective decomposition of CDF3 at natural abundance level (≈150ppm) in fluoroform has been achieved by infra-red multiple-photon excitation at moderate substrate pressure using 100 ns FWHM CO2 laser pulses. Effects of energy fluence, number of laser pulses, buffer gas pressure and substrate pressure on decomposition yield and bulk selectivity are reported and discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00697418
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  • 9
    Electronic Resource
    Electronic Resource
    Isotope selective ionization of tellurium dimers Te2 formed by excimer laser photodissociation of an organometallic compound: CH3TeTeCH3 (1986)
    Springer
    Applied physics 41 (1986), S. 213-215 
    Details
    ISSN: 1432-0649
    Keywords: 82.50 ; 82.80
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Usingone standard commercial dye laser, tellurium dimers Te2 — formed by excimer laser induced photoelimination from CH3TeTeCH3 at room temperature — are ionized isotope selectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00697400
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  • 10
    Electronic Resource
    Electronic Resource
    CO2 laser isotope separation of tritium with (CF3)3CT (1987)
    Springer
    Applied physics 42 (1987), S. 167-172 
    Details
    ISSN: 1432-0649
    Keywords: 82.50 ; 82.40 ; 42.60.Kg
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A new working molecule 1,1,1,3,3,3-hexafluoro-2-(trifluoromethyl)-propane-2-t (CF3)3CT, is reported for the isotope separation of tritium by TEA CO2-laser-induced multiphoton dissociation (MPD). Selective and efficient dissociation of (CF3)3CT was observed by irradiation at about 980 cm−1 where (CF3)3CH was nearly transparent. The critical fluence for dissociation of (CF3)3CT at 10R(28) 980.9 cm−1 was estimated to be as low as 4.6 J/cm2, which is the lowest of the tritiated halocarbons that we have ever reported. A detailed study was made of the pressure dependence of the dissociation rate constants for (CF3)3CT and (CF3)3CH to clarify the collisional effects in their MPD. The hydrogen isotope exchange between (CF3)3CH and HTO was found to be extremely rapid, which is advantageous in the practical laser separation cycle for tritium removal from water.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00693880
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