Infinite‐order sudden calculations of pressure broadening cross sections for noble gas–oxygen binary mixtures

1984 ◽  
Vol 81 (9) ◽  
pp. 3892-3907 ◽  
Author(s):  
Gregory C. Corey ◽  
Frederick R. McCourt
Keyword(s):  
Binary Mixtures ◽  
Cross Sections ◽  
Infinite Order ◽  
Noble Gas ◽  
Pressure Broadening

Pressure-broadening cross sections of multiplet-.SIGMA. molecules: oxygen-noble gas mixtures

1984 ◽  
Vol 88 (10) ◽  
pp. 2031-2036 ◽  
Author(s):  
G. C. Corey ◽  
F. R. McCourt ◽  
W. K. Liu
Keyword(s):  
Cross Sections ◽  
Noble Gas ◽  
Gas Mixtures ◽  
Pressure Broadening

Disorientation of Cs(62P1/2) atoms, induced in collisions with noble gases

1976 ◽  
Vol 54 (7) ◽  
pp. 748-752 ◽  
Author(s):  
B. Niewitecka ◽  
L. Krause
Keyword(s):  
Cross Sections ◽  
Noble Gas ◽  
Zero Magnetic Field ◽  
Zero Field ◽  
Buffer Gas ◽  
Resonance Fluorescence ◽  
Circularly Polarized ◽  
Low Field ◽  
Good Agreement ◽  
Gas Pressures

The disorientation of 62P1/2 cesium atoms, induced in collisions with noble gas atoms in their ground states, was systematically investigated by monitoring the depolarization of cesium resonance fluorescence in relation to noble gas pressures. The Cs atoms, contained together with a buffer gas in a fluorescence cell and located in zero magnetic field, were excited and oriented by irradiation with circularly polarized 8943 Å resonance radiation, and the resonance fluorescence, emitted in an approximately backward direction, was analyzed with respect to circular polarization. The experiments yielded the following disorientation cross sections which have been corrected for the effects of nuclear spin: Cs–He: 4.9 ± 0.7 Å2; Cs–Ne: 2.1 ± 0.3 Å2; Cs–Ar: 5.6 ± 0.8 Å2; Cs–Kr: 5.8 ± 0.9 Å2; Cs–Xe: 6.3 ± 0.9 Å2. The results are in good agreement with most of the available zero-field and low-field data.

Collisional cooling of the NO-He system The pressure broadening cross sections between 4·3 and 1·8 K

1989 ◽  
Vol 67 (2) ◽  
pp. 455-463 ◽  
Author(s):  
Daniel R. Willey ◽  
D.N. Bittner ◽  
Frank C. De Lucia
Keyword(s):  
Cross Sections ◽  
Pressure Broadening ◽  
Collisional Cooling

Experimental and theoretical CO2–Ar pressure-broadening cross sections and their temperature dependence

2001 ◽  
Vol 3 (18) ◽  
pp. 3924-3933 ◽  
Author(s):  
F. Thibault ◽  
B. Calil ◽  
J. Buldyreva ◽  
M. Chrysos ◽  
J.-M. Hartmann ◽  
...  
Keyword(s):  
Temperature Dependence ◽  
Cross Sections ◽  
Pressure Broadening

scholarly journals Charge Exchange Cross Sections for Noble Gas Ions and N2 between 0.2 and 5.0 keV

Atoms ◽  
2019 ◽  
Vol 7 (4) ◽  
pp. 96
Author(s):  
Steven Bromley ◽  
Corey Ahl ◽  
Chad Sosolik ◽  
Joan Marler
Keyword(s):  
Charge Exchange ◽  
Cross Sections ◽  
Neutral Atom ◽  
Mechanical Design ◽  
Noble Gas ◽  
Dominant Role ◽  
Intermediate Energy ◽  
Fundamental Interaction ◽  
Gas Cell ◽  
Astrophysical Plasmas

Charge transfer of an electron from a neutral atom to an ion is a fundamental interaction that plays a dominant role in the energy balance of atmospheric and astrophysical plasmas. The present investigation measured the charge exchange cross sections of noble gas ions (He + , Ne + , Ar + , Kr + ) with N 2 in the intermediate energy range 0.2–5.0 keV. The systems were chosen because there remains a lack of consensus amongst previous measurements and regions where there were no previous measurements. A description of the mechanical design for an electrically floated gas cell is described herein.

scholarly journals Molecular cross-sections for high-resolution spectroscopy of super-Earths, warm Neptunes, and hot Jupiters

2020 ◽  
Vol 495 (1) ◽  
pp. 224-237 ◽  
Author(s):  
Siddharth Gandhi ◽  
Matteo Brogi ◽  
Sergei N Yurchenko ◽  
Jonathan Tennyson ◽  
Phillip A Coles ◽  
...  
Keyword(s):  
High Resolution ◽  
Cross Sections ◽  
Cross Correlation ◽  
High Resolution Spectroscopy ◽  
High Signal ◽  
Pressure Broadening ◽  
Spectral Signatures ◽  
Hot Jupiters ◽  
Wide Range ◽  
Infrared Spectral

ABSTRACT High-resolution spectroscopy (HRS) has been used to detect a number of species in the atmospheres of hot Jupiters. Key to such detections is accurately and precisely modelled spectra for cross-correlation against the R ≳ 20 000 observations. There is a need for the latest generation of opacities which form the basis for high signal-to-noise detections using such spectra. In this study we present and make publicly available cross-sections for six molecular species, H2O, CO, HCN, CH4, NH3, and CO2 using the latest line lists most suitable for low- and high-resolution spectroscopy. We focus on the infrared (0.95–5 μm) and between 500 and 1500 K where these species have strong spectral signatures. We generate these cross-sections on a grid of pressures and temperatures typical for the photospheres of super-Earth, warm Neptunes, and hot Jupiters using the latest H2 and He pressure broadening. We highlight the most prominent infrared spectral features by modelling three representative exoplanets, GJ 1214 b, GJ 3470 b, and HD 189733 b, which encompass a wide range in temperature, mass, and radii. In addition, we verify the line lists for H2O, CO, and HCN with previous high-resolution observations of hot Jupiters. However, we are unable to detect CH4 with our new cross-sections from HRS observations of HD 102195 b. These high-accuracy opacities are critical for atmospheric detections with HRS and will be continually updated as new data become available.

Kinetic Theory for Mixtures of Dilute Gases of Linear Rotating Molecules II. The Senftleben-Beenakker Effect of the Heat Conductivity

1972 ◽  
Vol 27 (10) ◽  
pp. 1383-1393 ◽  
Author(s):  
W. E. Köhler ◽  
H. H. Raum
Keyword(s):  
Magnetic Field ◽  
Cross Sections ◽  
Heat Conductivity ◽  
Noble Gas ◽  
Homogeneous Magnetic Field ◽  
Starting Point ◽  
Order Of Magnitude ◽  
Molecular Distribution Function ◽  
Transport Relaxation ◽  
Kinetic Treatment

Abstract The system of transport relaxation equations obtained from the linearized Waldmann-Snider equation is the starting point for the kinetic treatment of the heat conductivity for mixtures of linear diamagnetic molecules in an external homogeneous magnetic field. The connection of the occurring collision integrals with certain molecular cross sections is discussed and order of magnitude considerations are made for molecules with small nonsphericity of their interaction. With the Kagan polarization as the decisive rotational angular momentum anisotropy term in the molecular distribution function, an expression for the heat conductivity ini the presence of a magnetic field is derived for mixtures with an arbitrary number of components. The mole fraction dependence of the saturation values is studied for binary mixtures of rotating molecules and noble gas atoms for a simplified model. As an example, the system o-D2/He is considered.

Pressure Effects of Foreign Gases on the 535.0 nm Fluorescence Line of Thallium

1985 ◽  
Vol 40 (8) ◽  
pp. 800-809 ◽  
Author(s):  
E. Lisicki ◽  
A. Bielski ◽  
J. Szudy ◽  
J. Wolnikowski
Keyword(s):  
Cross Sections ◽  
Pressure Effects ◽  
Pressure Broadening ◽  
Fluorescence Line ◽  
Series Of Experiments ◽  
The Cross ◽  
The Impact

Results of a series of experiments on pressure effects caused by various foreign gases on the 535.0 nm Tl fluorescence line emitted due to the photodissociation of TlI-molecules are summarized and some aspects of the Doppler and pressure broadening of this line are discussed. The impact broadening- and shift-cross sections are determined for two sets of mean relative velocities ū of the emitter-perturber pair. An attempt is made to analyse the cross-sections for different perturbers by investigating their dependence on the quantity (α/ū)2/5, where α is the polarizability of the perturber.

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