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  • Articles  (4)
  • thermal conductivity  (2)
  • 82.50  (1)
  • 83,50  (1)
  • Springer  (4)
  • American Chemical Society
  • 1980-1984  (4)
  • 1
    Electronic Resource
    Electronic Resource
    Effect of rotational relaxation on the yield of the multiphoton dissociation of CF3Cl and CF3Br under TEA-CO2 laser pulses (1982)
    Springer
    Applied physics 29 (1982), S. 125-130 
    Details
    ISSN: 1432-0649
    Keywords: 33.80 K ; 82.50
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The yield of the multiphoton dissociation of CF3Cl and CF3Br induced by TEA-CO2 laser pulses has been studied in the pressure range between 0.25 and 8 Torr, the laser wavelength being chosen so as to excite preferentially the minor isotopic components13CF3Cl and13CF3Br. For both compounds the dissociation probability is found either to increase almost linearly or to decrease monotonously with gas pressure, according as the laser beam is focused or unfocused, respectively. This behaviour is explained by rotational relaxation effects, and a value of 22ns·Torr for the rotational self-relaxation time of CF3Cl is obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00692774
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of gas pressure and pulse length on the isotopically selective multiphoton dissociation of CF3Cl under CO2 laser pulses (1981)
    Springer
    Applied physics 25 (1981), S. 275-282 
    Details
    ISSN: 1432-0630
    Keywords: 33.80 K ; 83,50
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The multiphoton dissociation of CF3Cl induced by TEA-CO2 laser pulses has been studied in a focused beam geometry. TheR(10) [00°1–02°0] ( $$\bar v = 1071.9cm^{ - 1} $$ ) laser line was used, so as to dissociate preferentially the minor isotopic component13CF3Cl. The isotopic selectivityS and the dissociation probability per pulse ω were measured in the pressure range between 0.25 and 8 Torr. With short laser pulses (90 ns FWHM),S is found to increase slightly with gas pressure up to 2 Torr, and ω, to increase almost linearly over the whole pressure range studied. A schematic model is proposed which satisfactorily explains these results if the transition rates across the energy level spectrum of the CF3Cl molecules are assumed to increase with gas pressure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00902983
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  • 3
    Electronic Resource
    Electronic Resource
    Thermal conductivity measurement of n-butane over wide temperature and pressure ranges (1983)
    Springer
    International journal of thermophysics 4 (1983), S. 11-33 
    Details
    ISSN: 1572-9567
    Keywords: butane ; corresponding states ; critical region ; thermal conductivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The thermal conductivity of n-butane has been measured by a coaxial-cylinder method over a pressure range from 0.1 MPa up to 70 MPa and a temperature range from room temperature to 600 K, covering all fluid states. The estimated accuracy of the method is about 2%. Special emphasis has been given to the behavior of the thermal conductivity near the critical point, and the critical enhancement has been studied for 3.6 K〈δT〈176 K. The effect of inelastic collisions upon transport properties of the dilute gas has been discussed. The results obtained for the reduced critical enhancement as a function of the reduced critical temperature confirm the universality of the critical exponent, for the n-alkanes, whereas the reduced excess thermal conductivity outside the critical region is a function of the reduced density and of the n-alkane.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00504479
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  • 4
    Electronic Resource
    Electronic Resource
    Thermal conductivity of five hydrocarbons along the saturation line (1983)
    Springer
    International journal of thermophysics 4 (1983), S. 193-208 
    Details
    ISSN: 1572-9567
    Keywords: alkanes ; hydrocarbons ; liquids ; thermal conductivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The paper presents the results of new, absolute measurements of the thermal conductivity of five alkanes as a function of temperature at their saturation vapor pressure. The alkanes studied include the four normal alkanes n-octane, n-nonane, n-undecane, and n-tetradecane as well as the branched alkane, iso-octane. The results, which extend over the temperature range 282–373 K, have an estimated uncertainty limit of 1.5% deriving mainly from a correction for the effects of radiation absorption in the measurement process. The results are employed to generate effective core volumes for the fluids studied which may be employed to predict the density dependence of the thermal conductivity by means of an existing correlation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00502352
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