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  • 1
    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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  • 2
    Electronic Resource
    Electronic Resource
    T/D isotope selectivity in CO2 laser induced multiple-frequency multiphoton dissociation of trifluoromethane-T (1989)
    Springer
    Applied physics 49 (1989), S. 139-143 
    Details
    ISSN: 1432-0649
    Keywords: 82.50 ; 33
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Isotope-selective multiphoton dissociation of CTF3 in the presence of CDF3 by TEA CO2 laser is studied. The highest T/D selectivity of 58 was observed at a sample pressure of 2 Torr in the presence of 20 Torr of argon on excitation by the 9P(24) CO2 laser line. The effect of multiple-frequency irradiation on selectivity is studied in the P and Q branches of the v 2 absorption band of CTF3. No improvement in the selectivity is noticed on going from single- to multiple-frequency irradiation. These results are compared with previous multiple-frequency work on the CTF3/CHF3 system, and explained in terms of strong spectroscopic interference from 13CDF3 in the present case.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00332273
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Selectivity enhancement in tritium isotope separation by multiple frequency multiple photon dissociation of the CTF3/CHF3 System (1989)
    Springer
    Applied physics 49 (1989), S. 571-576 
    Details
    ISSN: 1432-0649
    Keywords: 82.50 ; 33
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Isotope separation of tritium by multiple photon dissociation process in multiple frequency fields of a TEA-CO2 laser is reported for the first time. A ten-fold improvement in the bulk selectivity was obtained in 8.5 Torr CTF3/CHF3 in the presence of buffer gas at room temperature using 9R(8) to 9R(14) CO2 laser lines compared to single frequency excitation. Investigations of various process parameters such as exciting laser frequencies, pulse energy, sample and buffer gas pressure indicate that this is a promising technique for the separation of tritium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00324959
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Infrared laser multiple photon dissociation of thiophene in gas phase (1989)
    Springer
    Applied physics 48 (1989), S. 437-443 
    Details
    ISSN: 1432-0649
    Keywords: 82.50 ; 33
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Infrared laser multiple photon excitation/dissociation of Thiophene (Th) was studied as a function of Th pressure, laser pulse energy, pulse duration and added buffer gas. While the excitation process was probed via optoacoustic technique, the stable reaction products were analyzed by IR spectroscopy and mass spectrometry. Although C2H2 and CH3C≡CH were the major hydrocarbon products under all experimental conditions, the distribution of these, as well as higher hydrocarbons of lower yield, was found to be very much dependent upon the experimental conditions. The laser induced reaction under dielectric breakdown conditions with either high substrate pressure or laser energy produced significant amount of CS2 and unidentified polymer as well. We propose a mechanism involving breakage of the C−S bond in Th to form an unstable 1,5-diradical which further decomposed via different channels. However, at higher substrate pressures, radical-Th reactions complicated the overall chemistry of the system. Evidences for collisional energy-pooling and rotational hole-filling were also obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00694545
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  • 5
    Electronic Resource
    Electronic Resource
    Role of deposition conditions, impurities and structural defects in the epitaxial growth of thin films (1981)
    Springer
    Applied physics 24 (1981), S. 85-88 
    Details
    ISSN: 1432-0630
    Keywords: 68.50 ; 61.70
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract A summary of the theoretical and experimental investigations carried out to understand the problem of epitaxy is given. The effect of deposition conditions and the nature of the substrate-deposit combination on the orientation of the final film is discussed. The importance of the nucleation and growth stages, reorientation and recrystallization effects and the influence of the impurities and defects in the substrate surface on the quality of the films deposited are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00900403
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  • 6
    Electronic Resource
    Electronic Resource
    Topology of wolfgram proteins and 2′, 3′-cyclic nucleotide 3′-phosphodiesterase in CNS myelin: Studies with proteases (1994)
    Springer
    Neurochemical research 19 (1994), S. 1113-1118 
    Details
    ISSN: 1573-6903
    Keywords: CNS myelin ; Wolfgram proteins ; CNPase ; proteases ; topology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The topological disposition of Wolfgram proteins (WP) and their relationship with 2′, 3′-cyclic nucleotide 3′-phosphodiesterase (CNPase) in human, rat, sheep, bovine, guinea pig and chicken CNS myelin was investigated. Controlled digestion of myelin with trypsin gave a 35KDa protein band (WP-t) when electrophoresed on dodecyl sulfate-polyacrylamide gel in all species. Western blot analysis showed that the WP-t was derived from WP. WP-t was also formed when rat myelin was treated with other proteases such as kallikrein, thermolysin and leucine aminopeptidase. Staining for CNPase activity on nitrocellulose blots showed that WP-t is enzymatically active. Much of the CNPase activity remained with the membrane fraction even after treatment with high concentrations of trypsin when WP were completely hydrolysed and no protein bands with M.W〉14KDa were detected on the gels. Therefore protein fragments of WP with M.W〈14KDa may contain CNPase activity. From these results, it is suggested that the topological disposition of all the various WP is such that a 35KDa fragment is embedded in the lipid bilayer and the remaining fragment exposed at the intraperiod line in the myelin structure which may play a role in the initiation of myelinogenesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00965143
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    Paper (German National Licenses)
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