The Experts below are selected from a list of 57 Experts worldwide ranked by ideXlab platform
Leonid Khriachtchev - One of the best experts on this subject based on the ideXlab platform.
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Noble Gas Chemistry
ChemInform, 2011Co-Authors: Wojciech Grochala, Leonid Khriachtchev, Markku RasanenAbstract:Noble-Gas Chemistry was started in 1962 with the discovery of xenon hexafluoroplatinate followed with a number of compounds binding xenon or krypton. We highlight the classical and more exotic Noble-Gas compounds and discuss the nature of their bonding starting with strongly bound systems and progressing to weak interactions. Noble-Gas hydrides with the common formula HNgY were found in 1995, which led later to the identification of the first argon compound HArF. The formation mechanism of Noble-Gas hydrides at low temperatures is described in detail followed with a model of bonding. The interactions of the NobleGas hydrides with their surroundings and with complexing molecules are discussed. The chapter ends with known and potential applications of Noble Gases and with challenges encountered.
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Physics and Chemistry at Low Temperatures - Physics and Chemistry at low temperatures
2011Co-Authors: Leonid KhriachtchevAbstract:Photoexcitation of Free Radicals and Molecular Ions Trapped in Rare-Gas Solids, M. E. Jacox Metal Atom Reactions to Form Novel Small Molecules, L. Andrews Conformational Changes in Cryogenic Matrices, R. Fausto et al. Photodynamics at Low Temperatures, in Time Domain, V. A. Apkarian and M. Pettersson Matrix Isolation of H and D atoms: Physics and Chemistry from 1.5 to 0.05 K, V. V. Khmelenko et al. Matrix Isolation Spectroscopy in Solid Parahydrogen: A Primer, M. E. Fajardo Matrix Isolation Spectroscopy in Helium Droplets, K. Kuyanov-Prozument et al. Cryogenic Solutions as a Tool to Characterize Red- and Blue-Shifting C-H...X Hydrogen Bonding, W. A. Herrebout and B. J. van der Veken Low-Temperature Infrared Spectroscopy of Surface Species, A. A. Tsyganenko Photolysis and Radiolysis of Water Ice, R. E. Johnson Cool Interstellar Physics and Chemistry, A. G. G. M. Tielens and L. J. Allamandola High-Resolution Single-Molecule Spectroscopy in Condensed Matter, M. Orrit and W. E. Moerner Noble-Gas Chemistry, W. Grochala et al. Modeling Structures and Spectra of Trapped Species in Low-Temperature Matrices, A. Nemukhin and B. Grigorenko Spectroscopy of Biological Molecules at Very Low Temperatures: Theoretical Studies, R. B. Gerber and J. Sebek
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Noble Gas hydrides new Chemistry at low temperatures
Accounts of Chemical Research, 2009Co-Authors: Leonid Khriachtchev, Markku Rasanen, Benny R GerberAbstract:Noble-Gas Chemistry has been undergoing a renaissance in recent years, due in large part to Noble-Gas hydrides, HNgY, where Ng = Noble-Gas atom and Y = electronegative fragment. These molecules are exceptional because of their relatively weak bonding and large dipole moments, which lead to strongly enhanced effects of the environment, complexation, and reactions. In this Account, we discuss the matrix-isolation synthesis of Noble-Gas hydrides, their spectroscopic and structural properties, and their stabilities. This family of species was discovered in 1995 and now has 23 members that are prepared in Noble-Gas matrices (HXeBr, HKrCl, HXeH, HXeOH, HXeO, etc.). The preparations of the first neutral argon molecule, HArF, and halogen-free organic Noble-Gas molecules (HXeCCH, HXeCC, HKrCCH, etc.) are important highlights of the field. These molecules are formed by the neutral H + Ng + Y channel. The first addition reaction involving HNgY molecules was HXeCC + Xe + H → HXeCCXeH, and this led to the first hydrid...
A. Muro - One of the best experts on this subject based on the ideXlab platform.
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Paroxysmal eruptions tracked by variations of helium isotopes: inferences from Piton de la Fournaise (La Réunion island)
Scientific Reports, 2020Co-Authors: G. Boudoire, A. L. Rizzo, I. Arienzo, A. MuroAbstract:Helium (He) with its isotopes (^3He, ^4He) is a key tracer enabling the Earth’s mantle and dynamics to be characterized. Enrichment in primordial helium (^3He) has been detected in volcanic Gases of numerous magmatic systems in different geodynamic settings. Despite past use to monitor volcano-tectonic unrest, temporal ^3He/^4He variability in volcanic emissions is still poorly constrained. Here, we investigate Noble Gas Chemistry of Piton de la Fournaise hotspot volcano, where temporal fluctuations of ^3He/^4He in response to the eruptive activity have never been studied. We compare the ^3He/^4He signature of volcanic Gases and fluid inclusions and we highlight analogous evolution of the ^3He/^4He signature in both during the last decades of eruptive activity (1990–2017), even during the same eruption. We show that the maximum enrichment in ^3He is found in magmatic fluids that fed the most voluminous eruptions which culminated in caldera collapse events. We argue that this enrichment in ^3He mostly reflects a greater contribution of magmatic fluids from a primitive component of the mantle plume. These results emphasize that He isotopes may provide warnings of increases in deep magmatic contributions that potentially herald paroxysmal eruptions, as documented here at Piton de la Fournaise (2007) and also at Kilauea (2018).
Karl O Christe - One of the best experts on this subject based on the ideXlab platform.
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Neil Bartlett (1932–2008)
Nature, 2008Co-Authors: Karl O ChristeAbstract:Founder of Noble-Gas Chemistry.
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a renaissance in Noble Gas Chemistry
Angewandte Chemie, 2001Co-Authors: Karl O ChristeAbstract:Abstract : In spite of the predictions of stable Noble-Gas compounds since at least 1902, unsuccessful attempts at their synthesis gave rise to the widely held opinion that Noble-Gases are not only Noble but also inert . Thus, dogma-like statements to this effect could be found in practically every Chemistry textbook and discouraged or a long time, experimentalists to work in this area. It was not until 1962 that this dogma was shattered when Bartlett in Canada and Hoppe in Germany independently discovered with XePtF6 and XeF2, respectively, the first stable Noble-Gas compounds. These discoveries triggered an explosion of worldwide frenzy in this area and within a short span of time many new xenon, radon and krypton compounds were prepared and characterized. About 30 years and many publications later, new results in this area had slowed down to a trickle and in the minds of most chemists the chapter on Noble-Gas Chemistry had been completed. A recent burst of startling discoveries, however, shows that Noble-Gas Chemistry is still full of surprises and may signal the beginning of a renaissance in this field.
Benny R Gerber - One of the best experts on this subject based on the ideXlab platform.
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Noble Gas hydrides new Chemistry at low temperatures
Accounts of Chemical Research, 2009Co-Authors: Leonid Khriachtchev, Markku Rasanen, Benny R GerberAbstract:Noble-Gas Chemistry has been undergoing a renaissance in recent years, due in large part to Noble-Gas hydrides, HNgY, where Ng = Noble-Gas atom and Y = electronegative fragment. These molecules are exceptional because of their relatively weak bonding and large dipole moments, which lead to strongly enhanced effects of the environment, complexation, and reactions. In this Account, we discuss the matrix-isolation synthesis of Noble-Gas hydrides, their spectroscopic and structural properties, and their stabilities. This family of species was discovered in 1995 and now has 23 members that are prepared in Noble-Gas matrices (HXeBr, HKrCl, HXeH, HXeOH, HXeO, etc.). The preparations of the first neutral argon molecule, HArF, and halogen-free organic Noble-Gas molecules (HXeCCH, HXeCC, HKrCCH, etc.) are important highlights of the field. These molecules are formed by the neutral H + Ng + Y channel. The first addition reaction involving HNgY molecules was HXeCC + Xe + H → HXeCCXeH, and this led to the first hydrid...
Markku Rasanen - One of the best experts on this subject based on the ideXlab platform.
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Noble Gas Chemistry
ChemInform, 2011Co-Authors: Wojciech Grochala, Leonid Khriachtchev, Markku RasanenAbstract:Noble-Gas Chemistry was started in 1962 with the discovery of xenon hexafluoroplatinate followed with a number of compounds binding xenon or krypton. We highlight the classical and more exotic Noble-Gas compounds and discuss the nature of their bonding starting with strongly bound systems and progressing to weak interactions. Noble-Gas hydrides with the common formula HNgY were found in 1995, which led later to the identification of the first argon compound HArF. The formation mechanism of Noble-Gas hydrides at low temperatures is described in detail followed with a model of bonding. The interactions of the NobleGas hydrides with their surroundings and with complexing molecules are discussed. The chapter ends with known and potential applications of Noble Gases and with challenges encountered.
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Noble Gas hydrides new Chemistry at low temperatures
Accounts of Chemical Research, 2009Co-Authors: Leonid Khriachtchev, Markku Rasanen, Benny R GerberAbstract:Noble-Gas Chemistry has been undergoing a renaissance in recent years, due in large part to Noble-Gas hydrides, HNgY, where Ng = Noble-Gas atom and Y = electronegative fragment. These molecules are exceptional because of their relatively weak bonding and large dipole moments, which lead to strongly enhanced effects of the environment, complexation, and reactions. In this Account, we discuss the matrix-isolation synthesis of Noble-Gas hydrides, their spectroscopic and structural properties, and their stabilities. This family of species was discovered in 1995 and now has 23 members that are prepared in Noble-Gas matrices (HXeBr, HKrCl, HXeH, HXeOH, HXeO, etc.). The preparations of the first neutral argon molecule, HArF, and halogen-free organic Noble-Gas molecules (HXeCCH, HXeCC, HKrCCH, etc.) are important highlights of the field. These molecules are formed by the neutral H + Ng + Y channel. The first addition reaction involving HNgY molecules was HXeCC + Xe + H → HXeCCXeH, and this led to the first hydrid...