Diffusion in multicomponent gaseous mixtures. Part 3

1967 ◽  
Vol 45 (16) ◽  
pp. 1825-1828 ◽  
Author(s):  
Harry Watts
Keyword(s):  
Kinetic Theory ◽  
Multicomponent Mixture ◽  
Equimolar Mixture ◽  
Rare Gas ◽  
Rare Gases ◽  
Binary Diffusion ◽  
Gaseous Mixtures ◽  
Diffusion Systems ◽  
Theory Equation ◽  
Xenon 133

Diffusion of one rare gas into an equimolar mixture of two other rare gases has been followed using krypton-85 or xenon-133 tracer. The systems behave as pseudo-binary diffusion systems. A kinetic theory equation, valid for diffusion of a trace in a multicomponent mixture, is not a good approximation for diffusion of a major component.

Collision-induced microwave absorption in gaseous mixtures of various rare gases at 2.3 cm−1

1980 ◽  
Vol 58 (5) ◽  
pp. 633-641 ◽  
Author(s):  
I. R. Dagg ◽  
W. D. Leckie ◽  
L. A. A. Read
Keyword(s):  
Microwave Absorption ◽  
Room Temperature ◽  
Infrared Region ◽  
Exponential Model ◽  
Rare Gas ◽  
Rare Gases ◽  
Gaseous Mixtures ◽  
Induced Dipole ◽  
Upper Limits ◽  
Density Ratios

Collision-induced microwave absorption has been observed at 2.3 cm−1 for the rare gas mixtures Ne–Kr, Ar–Kr, Ar–Xe, and Kr–Xe. The absorption coefficient has been measured at room temperature for density products up to 8000 amagat2 and for various density ratios. These results have been used in conjunction with those of the infrared region to determine more accurately the zeroth moment for each of the spectra and hence have allowed improved values for the induced dipole moment parameters for the exponential model. Upper limits to the absorption in He–Xe and He–Ar mixtures in the microwave region have also been established.

Messung der Krypton-85-und Xenon-133-Aktivität der atmosphärischen Luft / A Method for Measurement of the Krypton-85 and Xenon-133-content in the Atmosphere

1977 ◽  
Vol 32 (11) ◽  
pp. 1249-1253 ◽  
Author(s):  
H. Stockburger ◽  
H. Sartorius
Keyword(s):  
Activated Carbon ◽  
Proportional Counter ◽  
Molecular Sieve ◽  
Room Temperature ◽  
Sampling Time ◽  
Rare Gas ◽  
Activity Levels ◽  
Separation And Purification ◽  
Rare Gases ◽  
Xenon 133

AbstractTo measure the 85Kr and 133Xe content in the atmosphere approximately 60 m3 of dried and CO2-removed air are pumped through activated carbon (pressure 300 torr, temperature 77 K) during one week. When sampling time is over, the carbon is heated to 570 K. This gives a gas sample of 41 with more than 90% of the atmospherical krypton and xenon within two hours. With a further step of enrichment, the volume of sample is reduced to 100 ml. The final separation and purification of the rare gases from O2, N2, CO and CO2 is made chromatographically. First the xenon is sepa­rated in a column filled with molecular sieve (5A) at 390 K, after that the krypton is separated in a column with activated charcoal at room temperature with methane as a "carrier gas" and is simultaneously transported to a proportional counter (230 ml). In the first half-year of 1977 the activity levels of 85Kr and 133Xe ran to 17.7 respectively 0.19 pCi/m3 air. The variations of the rare gas-activities are indeed rather high. The xenon-activities are not correlated with the krypton-activities. In a preliminary discussion we try to find reasons for these variations.

Ozone yields from the Febetron radiolysis of oxygen – rare gas mixtures

1977 ◽  
Vol 55 (2) ◽  
pp. 203-209 ◽  
Author(s):  
A. W. Boyd ◽  
O. A. Miller ◽  
E. B. Selkirk
Keyword(s):  
Excited State ◽  
Gas Mixtures ◽  
Rare Gas ◽  
Rare Gases

Ozone yields have been measured from the Febetron irradiation of mixtures containing 1–50 mol% oxygen and each of the five rare gases. The maximum values of G(O3) calculated using the energy absorbed only in the rare gas are obtained with the addition of less than 10% oxygen and are for: He, 16; Ne, 14; Ar, 11; Kr, 10; Xe, 12; each with an uncertainty of less than ±10%. On the addition of 0.2 mol% SF6 these yields are reduced to 6,5,1,2, and 2.5 respectively.These values are compared with those derived from ion and excited state yields and the contributions of subexcitation electrons.

Collision-induced absorption in ethane–rare gas mixtures

1983 ◽  
Vol 61 (4) ◽  
pp. 633-640 ◽  
Author(s):  
I. R. Dagg ◽  
L. A. A. Read ◽  
A. Anderson
Keyword(s):  
Fourier Transform ◽  
Temperature Dependence ◽  
Quadrupole Moment ◽  
Gas Mixtures ◽  
Rare Gas ◽  
Fourier Transform Spectrometer ◽  
Rare Gases ◽  
Induced Absorption ◽  
Absolute Value ◽  
The Absolute

The collision-induced spectra of mixtures of ethane and each of the rare gases He, Ar, Kr, and Xe in the 40–360 cm−1 region have been obtained using a Michelson Fourier transform spectrometer. In addition, the temperature dependence of the absorption in ethane and ethane–xenon mixtures is reported. All results have been analyzed according to the theory for quadrupole induced rotation–translation absorption. The absolute value of the quadrupole moment of ethane is estimated to be less than 1.0 B and most likely less than 0.5 B. Various speculations are made concerning the induction mechanisms (other than quadrupolar) for each of the mixtures.

Generation of the organo-rare gas dications HCCRg2+ (Rg = Ar and Kr) in the reaction of acetylene dications with rare gases

2008 ◽  
Vol 10 (47) ◽  
pp. 7121 ◽  
Author(s):  
Daniela Ascenzi ◽  
Paolo Tosi ◽  
Jana Roithová ◽  
Claire L. Ricketts ◽  
Detlef Schröder ◽  
...  
Keyword(s):  
Rare Gas ◽  
Rare Gases

Bonding of Rare-Gas Atoms to Si in Reactions of Rare Gases with SiF3+

2001 ◽  
Vol 105 (49) ◽  
pp. 11073-11079 ◽  
Author(s):  
A. Cunje ◽  
V. I. Baranov ◽  
Y. Ling ◽  
A. C. Hopkinson ◽  
D. K. Bohme
Keyword(s):  
Rare Gas ◽  
Rare Gases ◽  
Rare Gas Atoms

Uredelgase in einigen Steinmeteoriten

1960 ◽  
Vol 15 (7) ◽  
pp. 600-612 ◽  
Author(s):  
J. Zähringer ◽  
W. Gentner
Keyword(s):  
Large Deviations ◽  
Isotopic Composition ◽  
Gas Content ◽  
Rare Gas ◽  
Rare Gases

In the two chondrites Kapoeta and Abee outstanding rare gas content have been found. From the amount and isotopic composition it is concluded that primordial rare gases have been included in these meteorites. Kapoeta contains all rare gases in excess, while Abee has mainly the heavier rare gases as primordial component. The Ne20/Ne22—and A36/A38—ratios show large deviations from atmospheric Neon and Argon. No such large deviations could be found for Krypton and Xenon.

The Influence Of Matter And Black-Body Radiation Photons On The Dipole Polarizabilities A And γ Of Atoms

1996 ◽  
Vol 51 (7) ◽  
pp. 805-808 ◽  
Author(s):  
Uwe Hohm
Keyword(s):  
Reaction Rate ◽  
Black Body ◽  
Black Body Radiation ◽  
Rare Gas ◽  
Dipole Polarizability ◽  
Rare Gases ◽  
Reaction Rate Constants ◽  
Molecule Reaction ◽  
Rare Gas Atoms ◽  
Linear Dipole

Abstract The influence of the surroundings on the linear dipole polarizability α and second hyperpo-larizability γ is discussed in terms of the density ϱM of isotropically distributed matter as well as the density ϱp of thermal black-body radiation photons, α and γ of the rare gas atoms are studied as examples. At standard conditions, both effects are of comparable size for the rare gases. Possible consequences for ion-molecule reaction rate constants in astronomical environments are suggested.

Electron loss cross sections from rare gas atoms to Ar+

1982 ◽  
Vol 60 (7) ◽  
pp. 977-980
Author(s):  
B. Hird ◽  
S. P. Ali
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Energy Region ◽  
Rare Gas ◽  
Electron Loss ◽  
Rare Gases ◽  
Thin Target ◽  
Rare Gas Atoms ◽  
Good Agreement

Measurements of the σ10 cross section for a beam of Ar+ ions of energies between 30 and 120 keV passing through a thin target of the rare gases show good agreement with the few previous measurements in this energy region.

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