Intermolecular Potentials. I. Carbon Tetrafluoride and Sulfur Hexafluoride. II. Carbon Dioxide

1951 ◽  
Vol 19 (7) ◽  
pp. 849-855 ◽  
Author(s):  
K. E. MacCormack ◽  
W. G. Schneider
Keyword(s):  
Carbon Dioxide ◽  
Sulfur Hexafluoride ◽  
Intermolecular Potentials ◽  
Carbon Tetrafluoride

Sulfur hexafluoride F6S + CO2 Carbon dioxide

2006 ◽  
pp. 1-1
Author(s):  
C. J. Wormald ◽  
J.-P. E. Grolier ◽  
J.-C. Fontaine ◽  
K. Sosnkowska-Kehiaian ◽  
H. V. Kehiaian
Keyword(s):  
Carbon Dioxide ◽  
Sulfur Hexafluoride

Ultraviolet Spectral Analysis and Quantitative Detection of Heptafluoroisobutyronitrile (C4F7N) in a C4F7N–Carbon Dioxide (CO2) Gas Mixture

2019 ◽  
Vol 73 (8) ◽  
pp. 917-926 ◽  
Author(s):  
Yin Zhang ◽  
Xiaoxing Zhang ◽  
Chang Liu ◽  
Yi Li ◽  
Zhaolun Cui ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Absorption Spectroscopy ◽  
Density Functional ◽  
Sulfur Hexafluoride ◽  
Detection System ◽  
Spectral Characteristics ◽  
Uv Absorption ◽  
Quantitative Detection ◽  
Gas Mixture ◽  
Uv Absorption Spectroscopy

As an alternative to sulfur hexafluoride (SF6) with great potential for application, heptafluoroisobutyronitrile–carbon dioxide (C4F7N–CO2) gas mixture has been applied in various gas-insulated equipment. The insulation performance of the gas mixture is closely related to the mixing ratio. Therefore, accurate quantification of C4F7N in the C4F7N–CO2 gas mixture has very important engineering significance. At present, there are few reports on the rapid quantitative detection of the concentration of C4F7N in the gas mixture. In this paper, a rapid analytical method for C4F7N concentration based on ultraviolet (UV) absorption spectroscopy is constructed. The UV spectral characteristics of C4F7N molecules are calculated by density functional theory. The appropriate bands that can be detected are determined by analyzing the calculated results. A concentration detection system of C4F7N based on UV absorption spectroscopy is built. Through analysis of the calculated results and experimental results, a quantitative detection method of C4F7N in the C4F7N/CO2 gas mixture is determined. The method can achieve accurate detection of the concentration of the gas mixture in the conventional application range (including 4–10% C4F7N). The coefficient of the determination R2 of the concentration inversion curve reaches 0.999 and the inversion error ratio does not exceed 5%. The related research results provide an important reference for the engineering application of the gas mixture.

The Concentration Dependence at 1 atm Pressure and 300 °K of the Binary Diffusion Coefficients of the Systems Helium – Carbon Dioxide, Helium – Nitrous Oxide, and Helium – Sulfur Hexafluoride

1972 ◽  
Vol 50 (12) ◽  
pp. 1874-1876 ◽  
Author(s):  
Kenneth R. Harris ◽  
T. N. Bell ◽  
Peter J. Dunlop
Keyword(s):  
Carbon Dioxide ◽  
Nitrous Oxide ◽  
Diffusion Coefficient ◽  
Concentration Dependence ◽  
Mole Fraction ◽  
Diffusion Coefficients ◽  
Sulfur Hexafluoride ◽  
Enskog Theory ◽  
Binary Diffusion ◽  
Binary Diffusion Coefficients

Binary diffusion coefficients are reported for the systems He–CO2, He–N2O, and He–SF6. In agreement with the Chapman–Enskog theory the concentration dependence of the diffusion coefficient of each system increases with the mole fraction of the heavier component.

Age of Air in the Stratosphere from Observations

2020 ◽  
Author(s):  
Marianna Linz ◽  
Benjamin Birner ◽  
Alan Plumb ◽  
Edwin Gerber ◽  
Florian Haenel ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Nitrous Oxide ◽  
Sulfur Hexafluoride ◽  
Trace Gases ◽  
Trace Gas ◽  
Calculation Methods ◽  
Stratospheric Circulation ◽  
Tracer Age ◽  
Compact Relationship

<p>Age of air is an idealized tracer often used as a measure of the stratospheric circulation. We will show how to quantitatively relate age to the diabatic circulation and the adiabatic mixing. As it is an idealized tracer, age cannot be measured itself and must be inferred from other tracers. Typically, the two primary trace gases used are sulfur hexafluoride and carbon dioxide. Other tracers have a compact relationship with age, however, and can also be used to calculate age. We will discuss a range of tracer measurements from both satellites and in situ, including sulfur hexafluoride, carbon dioxide, nitrous oxide, methane, and the ratio of argon to nitrogen. We will compare the age derived from these different species, including different calculation methods and caveats, and compare with modeled ideal age and trace gas concentrations. We conclude by showing the strength of the diabatic circulation and the adiabatic mixing calculated from these trace gas calculations.</p>

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