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  • Articles  (10)
  • 82.50  (9)
  • Fisheries
  • Inorganic Chemistry
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  • Springer  (10)
  • 1995-1999
  • 1990-1994  (10)
  • 1950-1954
  • 1990  (10)
  • Physics  (10)
  • 1
    Electronic Resource
    Electronic Resource
    13C-selective IRMPD of CBr2F2/Cl2 and CCl2F2/Br2 systems (1990)
    Springer
    Applied physics 51 (1990), S. 103-107 
    Details
    ISSN: 1432-0649
    Keywords: 82.50 ; 33
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The CO2 TEA laser irradiation of CBr2F2 in the presence of Cl2 yielded 13C-enriched CBrClF2 and 13C-enriched CCl2F2 under selected experimental conditions. As the photolysis proceeded, the 13C concentration of CBrClF2 decreased gradually and that of CCl2F2 increased up to 90% or higher. These results can be explained by the mechanism involving the secondary 13C-selective IRMPD of the primary product CBrClF2. On the other hand, the carbon-containing product for a CCl2F2/Br2 system was only CBrClF2; the further IRMPD of which probably regenerated CBrClF2 in the presence of Br2. The decomposition probabilities of 12C- and 13C-containing molecules in both systems were measured as functions of laser line, laser fluence, and reactant pressures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00326008
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  • 2
    Electronic Resource
    Electronic Resource
    XeCl laser ablation of polyetheretherketone (1990)
    Springer
    Applied physics 51 (1990), S. 314-316 
    Details
    ISSN: 1432-0649
    Keywords: 82.50 ; 42.60
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Ablation of polyetheretherketone (PEEK), a high temperature thermoplastic, by XeCl laser radiation occurs at fluences in excess of 0.07±0.01 J cm−2. The volatile products of ablation are CO and C2H2 with smaller quantities of CH4, C4H2, C6H6 and other C3 and C4 hydrocarbons. At fluences close to the threshold ablation produces involatile material of relatively high molecular weight but at high fluences extensive disruption of the PEEK structure occurs with conversion of all of the oxygen in the polymer to carbon monoxide.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00348965
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  • 3
    Electronic Resource
    Electronic Resource
    UV desorption and photochemistry of dimethylgold hexafluoroacetylacetonate adsorbed on a quartz substrate (1990)
    Springer
    Applied physics 51 (1990), S. 443-450 
    Details
    ISSN: 1432-0649
    Keywords: 82.50 ; 82.65NZ
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The photodesorption and photodecomposition pathways of dimethylgold hexafluoroacetylacetonate, DMG (hfac), adsorbed on a cooled quartz substrate is reported for 222-nm KrCl excimer laser radiation. The time-of-flight (TOF) of neutral photoproducts, desorbed from the surface of the gold film formed during the experiment, were analyzed under collisionless conditions by a differentially-pumped mass spectrometer. Extensive dissociation of adsorbed DMG (hfac) into DMG and the hfac ligand was observed. The ligand was found to recombine with a CH3 radical on the surface. Translational energy distributions for the detected species were obtained by deconvoluting the TOF curves into a self-consistent set of Maxwell-Boltzmann distributions for the desorbed parent molecule, laser-induced decomposition products, and surface recombination reaction products. The implications of these results for the mechanistic details of the low-pressure, laser-assisted organometallic deposition of DMG(hfac) are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00329109
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  • 4
    Electronic Resource
    Electronic Resource
    18O-selective IR MPD of perfluorodimethyl ether (1990)
    Springer
    Applied physics 51 (1990), S. 454-457 
    Details
    ISSN: 1432-0649
    Keywords: 82.50 ; 33.00 ; 35.00
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The 18O-selective IR MPD of perfluorodimethyl ether (CF3)2O has been studied. The dissociation yields of (CF3)2 18O (β18) and (CF3)2 16O (β16) and the isotope selectivity α(18/16) have been measured as functions of TEA CO2-laser frequency, laser fluence and ether parent pressure. The (CF3)2O molecule has been found to provide highly efficient 18O separation. The MPD yield of the desired isotope 18O varies in the range 3–13%; the selectivity α(18/16) achieves a value of 95 at the laser line 10P22, at moderate fluence Ø=4 J/cm2 and at P (CF 3)2 O=0.5 Torr.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00329111
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  • 5
    Electronic Resource
    Electronic Resource
    13C-selective two-stage IRMPD of mixtures of CHClF2 and HI (1990)
    Springer
    Applied physics 50 (1990), S. 385-392 
    Details
    ISSN: 1432-0649
    Keywords: 82.50
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The 13C-selective infrared multiple-photon decomposition (IRMPD) of mixtures of CHClF2 and HI was examined in collimated and focused beam geometries using a CO2TEA laser. The carbon-containing products were CH2F2 and CHF2I. The former product showed remarkably high 13C atom concentrations beyond 95% under selected experimental conditions, while the latter contained 25% or less. The observed results can be explained satisfactorily in terms of the consecutive two-stage IRMPD process occurring in a single irradiation procedure, where the first-stage IRMPD of natural CHClF2 produces 13C-enriched CHF2I via the insertion of the initial decomposition fragment CF2 into HI, and the second stage is the subsequent 13C-selective IRMPD of the CHF2I to form a CHF2 radical and an I atom. The CHF2 radical reacts with HI to form CH2F2. Decomposition probabilities of 12CHClF2 and 13CHClF2 were measured as a function of laser fluence to optimize enrichment conditions. Furthermore, partial decomposition probabilities or relative production yields were measured as functions of laser line, pressure of HI, and pressure of CHClF2. Both stages showed high 13C selectivities in the irradiation with the laser radiation around 1040 cm−1 and at fluences below 4 J cm−2. This mixture is one of the most promising chemical systems for the production of highly enriched 13C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00325091
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  • 6
    Electronic Resource
    Electronic Resource
    Study of UV laser ablation by optothermal methods (1990)
    Springer
    Applied physics 51 (1990), S. 137-140 
    Details
    ISSN: 1432-0649
    Keywords: 06 ; 81.40 ; 82.50
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Optothermal methods for the study of UV laser ablation are discussed. Pyroelectric and photoacoustic measurements for PMMA and Al irradiated at 193 nm are reported. Ablation thresholds are estimated. The different mechanisms contributing to the signal generation are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00326014
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  • 7
    Electronic Resource
    Electronic Resource
    Laser photolytic deposition of molybdenum and tungsten thin film microstructures (1990)
    Springer
    Applied physics 50 (1990), S. 233-235 
    Details
    ISSN: 1432-0630
    Keywords: 81.15 ; 82.50
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract We have deposited thin metal films of Mo and W with sub-μm lateral resolution using the photodissociation of the carbonyls by the frequency doubled radiation of an Arion laser at cw and ps-pulse operation, respectively. In both regimes similar curves are obtained for the intensity dependence of the deposition rate. No difference was observed for the lateral resolution using cw or ps-pulse irradiation. Measurements of the deposition rate as a function of the spot size indicate that the decomposition occurs in the adsorbed phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00343423
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  • 8
    Electronic Resource
    Electronic Resource
    Synthesis of chromium silicide with laser pulses (1990)
    Springer
    Applied physics 50 (1990), S. 411-415 
    Details
    ISSN: 1432-0630
    Keywords: 68.55 ; 79.20D ; 82.50
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Thin chromium films, 60 nm thick, were deposited onto single-crystal silicon wafers. The samples were irradiated with 30 ns single pulses from a Nd: glass laser at fluences ranging from 0.4 to 2.25 J/cm2. Rutherford backscattering spectrometry, transmission electron microscopy and electron diffraction measurements evidence the formation of CrSi2 layers at the Cr/Si interface. The silicide thickness depends on the laser fluence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00323599
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  • 9
    Electronic Resource
    Electronic Resource
    Influence of electric field on heterogeneous reactions stimulated by laser light (1990)
    Springer
    Applied physics 50 (1990), S. 101-105 
    Details
    ISSN: 1432-0630
    Keywords: 81.60 ; 82.50 ; 82.65
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract We present experimental data for vanadium and copper oxidation by cw CO2 laser light in an external electric field. Direct influence of the external field on the crystallisation process has been demonstrated in both vanadium and copper cases; the oxidation rate and surface morphology depend sensitively on the sign and strength of the external field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00323959
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  • 10
    Electronic Resource
    Electronic Resource
    Studies on organ weights in naproxen treated rats after intermittent exposure to simulated high altitude (1990)
    Springer
    International journal of biometeorology 34 (1990), S. 90-92 
    Details
    ISSN: 1432-1254
    Keywords: Rats ; Naproxen ; Hypoxia ; Organ weight
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography , Physics
    Notes: Abstract Rats were exposed intermittently for 8h per day over 6 days at simulated high altitude of 20 000 feet. One group of altitude-exposed animals was treated with naproxen, a prostaglandin inhibiting drug. Significant reduction in body weight gain was observed in both altitude-exposed and drug-treated altitude-exposed animals compared to the control group. Right and left ventricular weights and weights of the adrenal glands were increased significantly in altitude-exposed and altitude-exposed drug-treated animals. The weight of the spleen was increased significantly in altitude-exposed animals whereas no such increase of splenic weight was observed in drug-treated altitude-exposed group of animals. On the other hand, the weight of the liver was decreased significantly in both cases. In drug-treated altitude-exposed animals, the unaltered splenic weight was thought to be due to inhibition of the erythropoietic activity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01093453
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