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.

Collision-induced absorption in the far infrared region in ethylene – rare gas mixtures

1982 ◽  
Vol 60 (10) ◽  
pp. 1431-1441 ◽  
Author(s):  
I. R. Dagg ◽  
L. A. A. Read ◽  
W. Smith
Keyword(s):  
Fourier Transform ◽  
Far Infrared ◽  
Infrared Region ◽  
Gas Mixtures ◽  
Laser Source ◽  
Rare Gas ◽  
Fourier Transform Spectrometer ◽  
Rare Gases ◽  
Absolute Value ◽  
Far Infrared Laser

The collision-induced spectra of mixtures of ethylene and each of the rare gases He, Ne, Ar, Kr, and Xe in the 40–360 cm−1 region has been obtained using a Michelson Fourier transform spectrometer. In addition, improved results for the collision-induced spectrum of pure ethylene gas are reported using this spectrometer as well as a far infrared laser source. All the results from the pure gas and gas mixtures have been analyzed according to the theory for quadrupolar-induced translation–rotational absorption. From this analysis the following values for the components of the quadrupolar tensor are: Qxx = −3.12, Qvy = 1.55, and Qzz = 1.57 B, which are somewhat lower estimates (in absolute value) than previously reported by us. Evidence for induction by other mechanisms (other than quadrupolar) has been obtained for the He–C2H4 and Ne–C2H4 mixtures.

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 OF COMPRESSED GASES IN THE FAR INFRARED, PART I

1965 ◽  
Vol 43 (5) ◽  
pp. 729-750 ◽  
Author(s):  
D. R. Bosomworth ◽  
H. P. Gush
Keyword(s):  
Fourier Analysis ◽  
Infrared Absorption ◽  
Michelson Interferometer ◽  
Far Infrared ◽  
Gas Mixtures ◽  
Experimental Techniques ◽  
Rare Gas ◽  
Absorption Coefficients ◽  
Induced Absorption ◽  
Separate Paper

A study is being made of the far infrared absorption occurring in compressed rare-gas mixtures, and compressed homonuclear diatomic gases. The region investigated lies between 20 and 400 cm−1. The spectra are obtained from the Fourier analysis of interferograms produced by a dynamic Michelson interferometer. It is possible to obtain accurate absolute absorption coefficients for broad bands using this method provided care is exercised in the analysis of the interferograms. The necessary precautions are discussed in detail. The precision of the method obtained in practice is demonstrated using the far infrared bands of hydrogen and nitrogen as examples. Only the experimental techniques are discussed in this paper; the detailed results follow in a separate paper.

scholarly journals On the Pressure and Temperature Dependence of the Absorption Coefficient of NH3

2011 ◽  
Vol 2011 ◽  
pp. 1-7 ◽  
Author(s):  
F. Aousgi ◽  
S. Hadded ◽  
H. Aroui
Keyword(s):  
Fourier Transform ◽  
High Resolution ◽  
Absorption Coefficient ◽  
Temperature Dependence ◽  
Quadratic Function ◽  
Fourier Transform Spectrometer ◽  
Absorption Coefficients ◽  
Linear Evolution ◽  
Exponential Law ◽  
Quantum Numbers

The effects of pressure and temperature on the absorption coefficient of ammonia (NH3) gas self-perturbed and perturbed by nitrogen (N2) gas have been measured. We varied the gas pressure from 10 to 160 Torr and the temperature from 235 to 296 K in order to study the absorption coefficient at the center and the wings of lines in the ν4 band of NH3. These measurements were made using a high resolution (0.0038 cm-1) Bruker Fourier-transform spectrometer. These spectra have been analyzed using the method of multipressure technique permitting to succeed to an evolution of the absorption coefficient with the pressure and the quantum numbers J and K of the NH3 molecule. The results show that the absorption coefficient varies as a quadratic function of the pressure at the center of a given line. However, it has a linear evolution in the wings of the line. Moreover, the absorption coefficients are inversely proportional to temperature in the wings when NH3 lines are broadened by N2. The retrieved values of these coefficients were used to derive the temperature dependence of N2 broadening NH3 lines. The absorption coefficients were shown to fit closely the well-known exponential law.

Far-infrared collision-induced absorption in rare gas mixtures: Quantum and semi-classical calculations

2014 ◽  
Vol 140 (15) ◽  
pp. 154302 ◽  
Author(s):  
Ilya Buryak ◽  
Lothar Frommhold ◽  
Andrey A. Vigasin
Keyword(s):  
Far Infrared ◽  
Gas Mixtures ◽  
Rare Gas ◽  
Induced Absorption

scholarly journals Refractive Indices of Ge and Si at Temperatures between 4–296 K in the 4–8 THz Region

2021 ◽  
Vol 11 (2) ◽  
pp. 487
Author(s):  
Mira Naftaly ◽  
Steve Chick ◽  
Guy Matmon ◽  
Ben Murdin
Keyword(s):  
Refractive Index ◽  
Fourier Transform ◽  
Temperature Dependence ◽  
Phenomenological Model ◽  
Transmission Mode ◽  
High Resistivity ◽  
Refractive Indices ◽  
Fourier Transform Spectrometer ◽  
Mode A

Refractive indices of high resistivity Si and Ge were measured at temperatures between 4–296 K and at frequencies between 4.2–7.7 THz using a Fourier-transform spectrometer (FTS) in transmission mode. A phenomenological model of the temperature dependence of the refractive index is proposed.

COLLISION-INDUCED ABSORPTION OF COMPRESSED GASES IN THE FAR INFRARED, PART II

1965 ◽  
Vol 43 (5) ◽  
pp. 751-769 ◽  
Author(s):  
D. R. Bosomworth ◽  
H. P. Gush
Keyword(s):  
Infrared Spectra ◽  
Room Temperature ◽  
Broad Band ◽  
Far Infrared ◽  
Gas Mixtures ◽  
Frequency Region ◽  
Rare Gas ◽  
Induced Absorption ◽  
Far Infrared Spectra ◽  
Zero Frequency

The induced spectra of compressed helium–argon and neon–argon mixtures, and of compressed hydrogen, nitrogen, and oxygen have been measured in the frequency region 20 to 400 cm−1. The far-infrared spectra consist of a translational branch and a rotational branch which overlap, except in the rare-gas mixtures where only the translational component exists. The latter is a broad band which extends from zero frequency to about 500 cm−1, with a maximum near 150 cm−1 in the room-temperature gas. In the case of hydrogen the translational branch is readily distinguished from the rotational branch because it lies at a lower frequency than the latter. In the case of oxygen and nitrogen the spacing between the rotational lines is small and the translational and rotational branches overlap completely.

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