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  • Articles  (166)
  • Articles: DFG German National Licenses  (166)
  • Latest Papers from Table of Contents or Articles in Press
  • 82.50  (113)
  • 68.55  (59)
  • Springer  (166)
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  • Physics  (166)
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  • Articles  (166)
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  • Articles: DFG German National Licenses  (166)
  • Latest Papers from Table of Contents or Articles in Press
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  • Springer  (166)
  • American Chemical Society (ACS)
  • eLife Sciences Publications
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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
    Stepwise photoionization of complex organic molecules in the gas phase induced by UV laser radiation (1982)
    Springer
    Applied physics 27 (1982), S. 57-61 
    Details
    ISSN: 1432-0649
    Keywords: 33 ; 82.50 ; 42.55
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We measured the photoionization cross-sections of anthracene, 1,2-benzanthracene,p-terphenyl, and 2,5-diphenylfuran molecules excited to the singlet and triplet electronic states intermediate in the stepwise two-photon ionization process at 266 nm (all compounds) and at 355, 391 and 417 nm (anthracene).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00697297
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  • 6
    Electronic Resource
    Electronic Resource
    The characteristics of multiple-photon absorption of SF6 molecules cooled in free jet expansion from a pulsed supersonic nozzle (1982)
    Springer
    Applied physics 28 (1982), S. 367-372 
    Details
    ISSN: 1432-0649
    Keywords: 33 ; 82.50
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The multiple-photon absorption of pulsed TEA CO2 laser radiation by SF6 molecules cooled toT R≃40K andT v≃160K in the free jet expansion from a pulsed supersonic nozzle has been investigated at energy fluences of 0.1 to 3.0 J·cm−2. For practically all laser lines which coincide with the linear absorption spectrum of thev 3 vibrational mode of SF6 [P(12)...P(28), 10,6 m], the dependence of the absorbed energyE ab on the exciting energy fluence was found to be steeper than linearE ab∼Φn, wheren=(1.1 to 1.8). Considerable increases of the absorption cross sections with increasing energy fluence were observed. The fraction of the molecules interacting with the laser radiation is estimated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00686368
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  • 7
    Electronic Resource
    Electronic Resource
    Laser frequency dependent kinetics of cw laser induced reactions (1983)
    Springer
    Applied physics 30 (1983), S. 79-81 
    Details
    ISSN: 1432-0649
    Keywords: 82.50 ; 82.40
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract CF2ClCF2Cl and ethyl acetate have absorption bands of similar width centered at the same frequency. Kinetics of the decompositions of these compounds by a cw CO2 laser have been studied over a range of laser frequencies extending to 25 cm−1 below band center. At constant translational temperature and pressure, the CF2ClCF2Cl rate constant changes by more than 200 with frequency, while the corresponding change for ethyl acetate is at most 3. The effect of laser frequency increases with increasing CF2ClCF2Cl pressure, while the reverse is true in ethyl acetate. Arrhenius plots show activation energies independent of both frequency and pressure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00688480
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  • 8
    Electronic Resource
    Electronic Resource
    Laser photoion projector (1984)
    Springer
    Applied physics 33 (1984), S. 57-61 
    Details
    ISSN: 1432-0649
    Keywords: 33 ; 42.60 ; 82.50
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A laser photodesorption microscope has been applied to obtain 4×103-fold images of rhodamine crystals on a tip with a diameter of 66μm. Peculiarities of the formation of these images have been studied with different values of electric field strength on the tip and laser pulse intensities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00690026
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  • 9
    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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  • 10
    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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