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  • 1
    Electronic Resource
    Electronic Resource
    The absorption of pulsed CO2-laser radiation by tetrafluorosilane at various wavenumbers, fluences, pulse durations, temperatures, optical path lengths and pressures of absorbing and non-absorbing gases (1996)
    Springer
    Applied physics 62 (1996), S. 183-189 
    Details
    ISSN: 1432-0649
    Keywords: 33.80 ; 42.60
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The absorption of three linesP(30) (1037.4 cm−1),P(36) (1031.5 cm−1) andP(40) (1027.4cm−1) of the pulsed CO2 laser (0001–0200 transition) by SiF4 was examined at various pulse energies, pulse durations, temperatures, optical path lengths and pressures of this compound and several non-absorbing gases. In addition, the low-intensity infrared absorption spectrum of tetrafluorosilane was compared with high-intensity absorption data for all lines of the laser. The experimental dependences demonstrate nonlinear features of the absorption phenomena originating from the high power of the incident radiation and collisions of absorbing molecules with surroundings. These effects are included in the analytical formula, being an extended form of the Lambert-Beer law. which reasonably approximates all experimental data. The importance of the results obtained for understanding general features of multiphoton absorption and for revealing potential applications of SiF4 as a sensitizer for the infrared region is presented in brief.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01081123
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Theoretical and Experimental Investigations of The Decomposition of 10-methylacridinium Halides (2000)
    Springer
    Journal of thermal analysis and calorimetry 60 (2000), S. 35-43 
    Details
    ISSN: 1572-8943
    Keywords: kinetics ; 10-methylacridinium halides ; thermodynamics ; thermogravimetric investigations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract 10-Methylacridinium chloride, bromide and iodide were prepared in crystalline forms (the first two salts as monohydrates) and subjected to thermogravimetric investigations. Decomposition of the compounds is initially accompanied by the liberation of water (in case of monohydrates), halomethanes and acridine molecules. As decomposition proceeds, side reactions occur which are reflected in a complex pattern of thermogravimetric curves. TG traces corresponding to the initial decomposition stage were used to determine the kinetic characteristics of the thermal dissociation of the salts. MNDO/d, AM1 and PM3 methods were employed independently to examine reaction pathways and to predict thermodynamic and kinetic barriers for the thermal decomposition of the compounds. These data were subsequently supplemented with theoretically determined crystal lattice energies, which enabled the relevant characteristics for the decomposition of crystalline phases to be predicted. The theoretically predicted characteristics are qualitatively comparable with those originating from thermogravimetric investigations, which allows one to believe that both are valid.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010160132175
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    A Theoretical Approach to the Description of the Thermal Dissociation of N,N,N-Trimethylmethanaminium Halides (1998)
    Springer
    Journal of thermal analysis and calorimetry 54 (1998), S. 189-195 
    Details
    ISSN: 1572-8943
    Keywords: decomposition ; kinetics ; N,N,N-trimethylmethanaminium halides ; theory ; thermodynamics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract MNDO/d and PM3 quantum chemistry methods were used to examine reaction pathways and predict thermodynamic and kinetic barriers for the thermal dissociation of isolated conglomerates of N,N,N-trimethylmethanaminium cations (TMA+) and halide anions (X = Cl−, Br− and I−). Theoretically obtained changes in enthalpy and entropy for the above-mentioned process were subsequently supplemented with theoretically determined crystal lattice energies, that enabled prediction of relevant characteristics for the dissociation of crystalline phases. Data thus obtained compare only qualitatively with those available in literature and resulting predominantly from thermoanalytical investigations, although values of theoretical characteristics generally follow the same trends as experimental ones.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010185422885
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    Paper (German National Licenses)
    Fulltext
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