Unprecedented stability enhancement of multiply charged anions through decoration with negative electron affinity noble gases

2020 ◽  
Vol 22 (24) ◽  
pp. 13368-13372 ◽  
Author(s):  
Meenakshi Joshi ◽  
Tapan K. Ghanty
Keyword(s):  
Gas Phase ◽  
Electron Affinity ◽  
Noble Gases ◽  
Noble Gas ◽  
Negative Electron Affinity ◽  
Multiply Charged ◽  
Stability Enhancement

Noble gas inserted highly symmetric icosahedral B12Ng12F122− (Ng = Kr–Xe) dianions with exceptional electronic stability in the gas phase are predicted using DFT, MP2 and DLPNO-CCSD(T) based methods.

scholarly journals Super-electrophiles of Tri- and Tetra-Anions Stabilized by Selected Terminal Groups and Their Role in Binding Noble Gas atoms

2021 ◽  
Author(s):  
MingMin Zhong ◽  
Hong Fang ◽  
Deepika Deepika ◽  
Purusottam Jena
Keyword(s):  
Gas Phase ◽  
Noble Gas ◽  
Atomic Clusters ◽  
Weakly Coordinating Anions ◽  
Multiply Charged ◽  
Potential Applications ◽  
Weakly Coordinating

Stabilization of multiply-charged atomic clusters in the gas phase has been a topic of great interest not only because of their potential applications as weakly-coordinating anions, but also for their...

scholarly journals Adsorptive transport of noble gas tracers in porous media

2018 ◽  
Vol 48 ◽  
pp. 1860124 ◽  
Author(s):  
Matthew J. Paul ◽  
Steven R. Biegalski ◽  
Derek A. Haas ◽  
Justin D. Lowrey
Keyword(s):  
Porous Media ◽  
Gas Phase ◽  
Sulfur Hexafluoride ◽  
Noble Gases ◽  
Gas Adsorption ◽  
Noble Gas ◽  
Field Tests ◽  
Effective Diffusivity ◽  
Silica Sand ◽  
Adsorbed Phase

The transport of noble gas radionuclides in porous media is relevant to the detection of underground nuclear detonations as well as the sequestration of reprocessing off-gases. However, in field tests releasing radioxenon underground, the quantity of radioxenon observed at the surface has fallen well below expectations.[Formula: see text] This study examined the diffusivity of noble gases (Kr and Xe) and the inert molecular gas sulfur hexafluoride (SF[Formula: see text] in porous media to observe any unexpected behavior. To replicate the transport of radiogenic noble gases in underground media, a two-bulb gaseous diffusion apparatus was constructed. The two bulbs were connected with a column of 10–30 Ottawa sand and ordinary atmosphere filled both the bulbs and pore spaces. The tracer gases were diluted in an isolated bulb to approximately 1000 ppm. Once released, the gases were allowed to diffuse through the column. Aliquots were withdrawn at regular time intervals from both bulbs and concentrations were quantified using a Shimadzu QP2010 SE gas chromatograph-mass spectrometer. The effective diffusivity was then calculated using a maximum likelihood estimate on the quasi-steady state model. The effective diffusivity of Xe in the silica sand was observed to be 135.2% that of SF[Formula: see text] whereas the effective diffusivity of Kr was observed to be 161.4% that of sulfur hexafluoride. These findings are consistent with the binary diffusivities in N[Formula: see text]: 132.6% and 161.7%, respectively. However, the apparent volume of the system was inconsistent amongst the species, with Xe converging at slightly lower gas-phase concentrations than Kr or SF[Formula: see text]. This apparent reduction in gas-phase concentration occurred within the first few measurements and is consistent with transient accumulation of an adsorbed phase. As the effective diffusivities in the silica sand were shown to be consistent with the binary diffusivities in N[Formula: see text], a porosity-tortuosity model appears to be sufficient when considering similar geological materials. However, with the observation of significant gas adsorption, consideration of adsorbed-phase accumulation is necessary when scaling to larger geological systems.

Multiply charged ions produced in noble gases with a 1-ps laser pulse at 1053 nm

1993 ◽  
Author(s):  
Louis A. Lompre ◽  
T. Auguste ◽  
P. Monot ◽  
Gerard L. Mainfray ◽  
Claude Manus
Keyword(s):  
Laser Pulse ◽  
Noble Gases ◽  
Multiply Charged Ions ◽  
Multiply Charged ◽  
Charged Ions

scholarly journals The degradation of quantum efficiency in negative electron affinity GaAs photocathodes under gas exposure

2014 ◽  
Vol 47 (5) ◽  
pp. 055110 ◽  
Author(s):  
N Chanlek ◽  
J D Herbert ◽  
R M Jones ◽  
L B Jones ◽  
K J Middleman ◽  
...  
Keyword(s):  
Quantum Efficiency ◽  
Electron Affinity ◽  
Negative Electron Affinity ◽  
Gas Exposure
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