Introduction:Most of the primordial noble gases in meteorites are trapped in a poorly characterized carbonaceous carrier named " phase Q ". Marrocchi et al. [1] reported that the HF/HCl residue of Orgueil (CI) lost the low temperature fractions of heavy noble gases (36 Ar, 84 Kr and 132 Xe) in phase Q upon pyri-dine treatment. As pyridine is known to induce the swelling of the macromolecular ne...

Here we present a new method for the sampling and quantitative extraction of dissolved He, Ne, Ar, Kr, and Xe from lake sediment samples leading to determinations of porewater noble gas concentration profiles and the isotopic ratios 3He/4He, 20Ne/22Ne, and 40Ar/36Ar. Bulk sediment is transferred from a sediment core into standard Cu sample tubes without exposure to the atmosphere or other gas r...

A Geochemical Approach for Monitoring a CO2 Pilot Site: Rousse, France. A Major Gases, CO2-Carbon Isotopes and Noble Gases Combined Approach — This paper presents the geochemical characterization of various gas end-members involved in a depleted gas field CO2 storage pilot (Rousse, France). In this pilot, CO2 is produced by oxycombustion from natural gas transformed into fuel gas at the Lacq pl...

Semiconducting group 14 clathrates are inorganic host-guest materials with a close structural relationship to gas hydrates. Here we utilize this inherent structural relationship to derive a new class of porous semiconductor materials: noble gas filled group 14 clathrates (Ngx[M136], Ng = Ar, Kr, Xe and M = Si, Ge, Sn). We have carried out highlevel quantum chemical studies using periodic Local-...

Introduction: On the basis of several experiments on separates of the EH5 chondrite St. Mark’s, we will argue that the “subsolar” noble gas component is a mixture of solar-like, Qand terrestrial noble gases. The subsolar noble gas component has been found, in particular, in E chondrites [1,2] but also in other meteorite classes (e.g. aubrites, CO or CH chondrites [3-5]). This component is eleme...

This paper describes a technique in which noble gases such as 3He and 129Xe are polarized using optical pumping techniques, and used as a source of signal for magnetic resonance imaging. Techniques for polarizing the gas and a few representative examples of clinical applications are presented. Also emphasized is the connection between noble-gas imaging and the use of polarized gaseous targets i...

We present a detailed theoretical analysis of the noble-gas nuclear spin relaxation due to the anisotropic magnetic-dipole hyperfine interaction between the noble-gas nucleus and alkali-metal valence electron vis à vis the already well-understood (spin-conserving) isotropic magnetic-dipole hyperfine interaction in alkali-metal–noble-gas systems. We find that, for all pairs in which the noblegas...