Cross Sections for Excited-State Mixing in Cesium-Noble-Gas Collisions fromD2Optical Pumping

1967 ◽  
Vol 163 (1) ◽  
pp. 45-53 ◽  
Author(s):  
J. Fricke ◽  
J. Haas ◽  
E. Lüscher ◽  
F. A. Franz
Keyword(s):  
Excited State ◽  
Cross Sections ◽  
Noble Gas ◽  
State Mixing

scholarly journals Change In Total Angular Momentum Within The Z3F0 Titanium Excited State Induced By Collisions With Hydrogen And Nitrogen Molecules

1989 ◽  
Vol 10 (2) ◽  
pp. 93-107 ◽  
Author(s):  
V. Quichaud ◽  
D. Dézert ◽  
J. Aubreton ◽  
D. Degout ◽  
A. Catherinot
Keyword(s):  
Angular Momentum ◽  
Excited State ◽  
Cross Sections ◽  
Total Angular Momentum ◽  
Diatomic Molecules ◽  
Noble Gas ◽  
Excited Level ◽  
Time Resolved ◽  
Time Resolved Spectroscopy

Collisions that produce a change in the total angular-momentum and quenching processes involving the triplet Z3F0 titanium excited level and diatomic molecules have been studied by laser perturbation and time-resolved spectroscopy. The thermally averaged total angular-momentum changing cross sections (z3Fi0→z3Fj0) in units of 10−16cm2 are: σ¯42=3.2±1, 1.4±0.5; σ¯43=13.3±2, 6.8±1; σ¯32 =19.0±2, 7.2±1 , respectively, for nitrogen and hydrogen colliding partners.Large quenching cross sections are obtained, as σ−QN2=53±7, and σ−QH2=38±4 in units of 10-16 cm2. These results are discussed in relation with previous measurements dealing with titanium-noble-gas collisions, and with available published results.

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.

scholarly journals Neutron-inducedγ-ray production cross sections for the first excited-state transitions in20Ne and22Ne

2012 ◽  
Vol 86 (6) ◽  
Author(s):  
S. MacMullin ◽  
M. Boswell ◽  
M. Devlin ◽  
S. R. Elliott ◽  
N. Fotiades ◽  
...  
Keyword(s):  
Excited State ◽  
Cross Sections ◽  
Production Cross ◽  
State Transitions ◽  
First Excited State

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.

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.

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