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

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.

Collision Broadening and Shift of the 535.0 nm Tl Line Accompanying the Photodissociation of Thallium Iodide Perturbed by Noble Gases Part II: Effects due to He, Ne and Ar

1981 ◽  
Vol 36 (8) ◽  
pp. 807-812 ◽  
Author(s):  
E. Lisicki ◽  
A. Bielski ◽  
J. Szudy
Keyword(s):  
Noble Gases ◽  
Van Der Waals ◽  
Half Width ◽  
Line Profiles ◽  
Gas Density ◽  
Lennard Jones ◽  
Fabry Perot ◽  
Collision Broadening ◽  
Helium Neon

Abstract The broadening and shift of the 535.0 nm thallium line resulting from the photodissociation of thallium iodide perturbed by helium, neon and argon were investigated at low densities using a photoelectric Fabry-Perot interferometer. The Doppler and collision broadening components of the line profiles have been determined. Linear variations of both the Lorentzian half-width and the shift of the line with the perturbing gas density were found and interpreted in terms of Van der Waals and Lennard-Jones potentials.

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.

Solar noble gases in the Earth: The systematics of helium-neon isotopes in mantle derived samples

Lithos ◽  
1993 ◽  
Vol 30 (3-4) ◽  
pp. 257-265 ◽  
Author(s):  
Masahiko Honda ◽  
Ian McDougall ◽  
Desmond Patterson
Keyword(s):  
Noble Gases ◽  
The Earth ◽  
Helium Neon

Die Diffusion der Uredelgase Helium, Neon und Argon im Meteoriten Fayetteville

1968 ◽  
Vol 23 (2) ◽  
pp. 222-228
Author(s):  
R. H. Bieri ◽  
H. Fechtig
Keyword(s):  
Single Crystals ◽  
Noble Gases ◽  
Dark Phase ◽  
Average Ratio ◽  
Spallation Reactions ◽  
Diffusion Rates ◽  
Helium Neon

The diffusion of the primordial noble gases helium, neon and argon in several samples of the dark phase of the meteorite Fayetteville was investigated. It is found that the diffusion rates of the primordial noble gases are aparently 3 to 5 orders of magnitude higher than the diffusion rates of the gases which derive from spallation reactions. These differences however are explained by the location of the primordial noble gases in layers close to the surface of the single crystals. The average ratio between the crystal diameters and the thickness of the layers is calculated. The results are in agreement with the idea that the primordial gases were incorporated in the meteoritic material after solidification.

scholarly journals Neutral bremsstrahlung and excimer electroluminescence in noble gases and its relevance to two-phase dark matter detectors

2021 ◽  
Vol 81 (12) ◽  
Author(s):  
E. Borisova ◽  
A. Buzulutskov
Keyword(s):  
Dark Matter ◽  
Liquid Phase ◽  
Gas Phase ◽  
Theoretical Approach ◽  
Noble Gases ◽  
Particle Scattering ◽  
Excimer Emission ◽  
Two Phase ◽  
Ionization Signal ◽  
Helium Neon

AbstractProportional electroluminescence (EL) is the physical effect used in two-phase detectors for dark matter searches, to optically record (in the gas phase) the ionization signal produced by particle scattering in the liquid phase. In our previous work the presence of a new EL mechanism, namely that of neutral bremsstrahlung (NBrS), was demonstrated in two-phase argon detectors both theoretically and experimentally, in addition to the ordinary EL mechanism due to excimer emission. In this work the similar theoretical approach is applied to all noble gases, i.e. overall to helium, neon, argon, krypton and xenon, to calculate the EL yields and spectra both for NBrS and excimer EL. The relevance of the results obtained to the development of two-phase dark matter detectors is discussed.

scholarly journals Neuroprotection of dopamine neurons by xenon against low-level excitotoxic insults is not reproduced by other noble gases

2019 ◽  
Vol 127 (1) ◽  
pp. 27-34 ◽  
Author(s):  
Déborah Le Nogue ◽  
Jérémie Lavaur ◽  
Aude Milet ◽  
Juan Fernando Ramirez-Gil ◽  
Ira Katz ◽  
...  
Keyword(s):  
Cell Culture ◽  
Noble Gases ◽  
Glutamate Uptake ◽  
Noble Gas ◽  
Gas Diffusion ◽  
Dopamine Neurons ◽  
Low Level ◽  
Therapeutic Value ◽  
Nmda Glutamate Receptors ◽  
Helium Neon

AbstractUsing midbrain cultures, we previously demonstrated that the noble gas xenon is robustly protective for dopamine (DA) neurons exposed to l-trans-pyrrolidine-2,4-dicarboxylate (PDC), an inhibitor of glutamate uptake used to generate sustained, low-level excitotoxic insults. DA cell rescue was observed in conditions where the control atmosphere for cell culture was substituted with a gas mix, comprising the same amount of oxygen (20%) and carbon dioxide (5%) but 75% of xenon instead of nitrogen. In the present study, we first aimed to determine whether DA cell rescue against PDC remains detectable when concentrations of xenon are progressively reduced in the cell culture atmosphere. Besides, we also sought to compare the effect of xenon to that of other noble gases, including helium, neon and krypton. Our results show that the protective effect of xenon for DA neurons was concentration-dependent with an IC50 estimated at about 44%. We also established that none of the other noble gases tested in this study protected DA neurons from PDC-mediated insults. Xenon’s effectiveness was most probably due to its unique capacity to block NMDA glutamate receptors. Besides, mathematical modeling of gas diffusion in the culture medium revealed that the concentration reached by xenon at the cell layer level is the highest of all noble gases when neurodegeneration is underway. Altogether, our data suggest that xenon may be of potential therapeutic value in Parkinson disease, a chronic neurodegenerative condition where DA neurons appear vulnerable to slow excitotoxicity.

scholarly journals Electron Swarm Transport Through Low Pressure Noble Gases

1992 ◽  
Vol 45 (2) ◽  
pp. 185 ◽  
Author(s):  
G Dall’Armi ◽  
KL Brown ◽  
PH Purdie ◽  
J Fletcher
Keyword(s):  
Diffusion Coefficient ◽  
Drift Velocity ◽  
Noble Gases ◽  
Electron Drift Velocity ◽  
Current Work ◽  
Electron Drift ◽  
Longitudinal Diffusion ◽  
Transient Technique ◽  
Voltage Transient ◽  
Helium Neon

The electron drift velocity, the longitudinal diffusion coefficient and the electron ionisation coefficient have been measured in helium, neon, argon and krypton using the integrated voltage transient technique. Whilst the present data agree substantially with previous determinations at those values of E / N at which they overlap, the current work represents a marked extension of the range of E/N covered for We and NDL in most of the gases investigated.

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