Practical expression for an effective ion-neutral collision frequency in flowing plasmas of some noble gases

2013 ◽  
Vol 79 (6) ◽  
pp. 1123-1124 ◽  
Author(s):  
SERGEY A. KHRAPAK
Keyword(s):  
Drag Force ◽  
Noble Gases ◽  
Collision Frequency ◽  
Dusty Plasmas ◽  
Simple Expression ◽  
Particle Charging ◽  
Weakly Ionized ◽  
Helium Neon

AbstractA simple expression for the effective ion-neutral collision frequency in weakly ionized drifting plasmas of helium, neon, and argon is suggested. This expression can be useful for practical estimations related to the problems of particle charging and ion drag force in complex (dusty) plasmas.

Effective coffision frequency and electron temperature in a weakly ionized argon plasma

1980 ◽  
Vol 23 (2) ◽  
pp. 271-282
Author(s):  
C. P. Schneider
Keyword(s):  
Electron Temperature ◽  
High Frequency ◽  
Collision Frequency ◽  
Argon Plasma ◽  
Angular Frequency ◽  
Weak Electric Field ◽  
Hard Sphere Model ◽  
Plasma Conductivity ◽  
Gas Plasma ◽  
Weakly Ionized

Herein is described a calculation of the effective coffision frequency νeffof a low- density, shock-heated argon plasma under the influence of a weak electric field which oscillates harmonically with angular frequency ω. It is shown that, for the high frequency case ω >whereis the collision frequency in a Maxwellian gas plasma, one has νeff⋍ 2, provided that the imaginary part of the argon plasma conductivity is negligibly small in comparison to the real part. The influence of the theoretical model used to calculate νeffon the values of the electron temperatureTederived from measurements is compared with the results obtained in a data reduction for which the hard-sphere model for particle encounters was utilized.

Temperature-dependent instabilities in weakly ionized dusty plasmas

2019 ◽  
Vol 26 (6) ◽  
pp. 062107 ◽  
Author(s):  
P. Fahimi ◽  
M. M. Hatami
Keyword(s):  
Dusty Plasmas ◽  
Temperature Dependent ◽  
Weakly Ionized

Atomic Gold Ions Clustered with Noble Gases: Helium, Neon, Argon, Krypton, and Xenon

2019 ◽  
Vol 123 (44) ◽  
pp. 9505-9513 ◽  
Author(s):  
Paul Martini ◽  
Lorenz Kranabetter ◽  
Marcelo Goulart ◽  
Bilal Rasul ◽  
Michael Gatchell ◽  
...  
Keyword(s):  
Noble Gases ◽  
Helium Neon

Properties of ion-particle interaction and the ion drag force in complex (dusty) plasmas

2009 ◽  
Author(s):  
Sergey A. Khrapak ◽  
Bengt Eliasson ◽  
Padma K. Shukla
Keyword(s):  
Drag Force ◽  
Particle Interaction ◽  
Dusty Plasmas

Ion drag force on a dust grain in a weakly ionized collisional plasma

2013 ◽  
Vol 20 (1) ◽  
pp. 013701 ◽  
Author(s):  
I. L. Semenov ◽  
A. G. Zagorodny ◽  
I. V. Krivtsun
Keyword(s):  
Drag Force ◽  
Collisional Plasma ◽  
Weakly Ionized ◽  
Dust Grain

On Noble Gas Anomalies in the Great Namaqualand Troilite

1968 ◽  
Vol 23 (9) ◽  
pp. 1266-1271 ◽  
Author(s):  
E. C. Alexander ◽  
J. H. Bennett ◽  
O. K. Manuel
Keyword(s):  
Neutron Activation ◽  
Isotopic Composition ◽  
Neutron Capture ◽  
Noble Gases ◽  
Noble Gas ◽  
Helium Neon

The abundances and isotopic composition of the stable noble gases were measured in a troilite nodule from the Great Namaqualand fine octahedrite. Helium, neon and argon show a significant spallation component. The major anomalies in krypton and xenon are from neutron capture on selenium and tellurium and from the decay of extinct I129. The abundances of tellurium, iodine and uranium in the troilite were determined by neutron activation analyses and compared with the xenon anomalies. The results indicate that part of the excess Xe129 is from neutron capture on tellurium and the remainder is due to the retention of radiogenic Xe129 from the decay of extinct I129, about 200 million years after an initial I129/I127 = 3 × 10-3.

Noble Gases: A Record of Earth's Evolution and Mantle Dynamics

2019 ◽  
Vol 47 (1) ◽  
pp. 389-419 ◽  
Author(s):  
Sujoy Mukhopadhyay ◽  
Rita Parai
Keyword(s):  
Noble Gases ◽  
Noble Gas ◽  
Isotopic Ratios ◽  
Mantle Structure ◽  
Mantle Dynamics ◽  
Mid Ocean Ridge ◽  
Giant Impacts ◽  
Ocean Ridge ◽  
Helium Neon

Noble gases have played a key role in our understanding of the origin of Earth's volatiles, mantle structure, and long-term degassing of the mantle. Here we synthesize new insights into these topics gained from high-precision noble gas data. Our analysis reveals new constraints on the origin of the terrestrial atmosphere, the presence of nebular neon but chondritic krypton and xenon in the mantle, and a memory of multiple giant impacts during accretion. Furthermore, the reservoir supplying primordial noble gases to plumes appears to be distinct from the mid-ocean ridge basalt (MORB) reservoir since at least 4.45 Ga. While differences between the MORB mantle and plume mantle cannot be explained solely by recycling of atmospheric volatiles, injection and incorporation of atmospheric-derived noble gases into both mantle reservoirs occurred over Earth history. In the MORB mantle, the atmospheric-derived noble gases are observed to be heterogeneously distributed, reflecting inefficient mixing even within the vigorously convecting MORB mantle. ▪ Primordial noble gases in the atmosphere were largely derived from planetesimals delivered after the Moon-forming giant impact. ▪ Heterogeneities dating back to Earth's accretion are preserved in the present-day mantle. ▪ Mid-ocean ridge basalts and plume xenon isotopic ratios cannot be related by differential degassing or differential incorporation of recycled atmospheric volatiles. ▪ Differences in mid-ocean ridge basalts and plume radiogenic helium, neon, and argon ratios can be explained through the lens of differential long-term degassing.

Sign in / Sign up

Export Citation Format

Share Document