Noble gases dissolved in natural waters are useful tracers for quantifying physical processes. Here, we describe a field-deployable gas equilibration mass spectrometer (GEMS) that provides continuous, real-time measurements of Ne, Ar, Kr, and Xe mole ratios in natural waters. Gas is equilibrated with a membrane contactor cartridge and measured with a quadrupole mass spectrometer, after in-line ...

• MOF-11 breaks the trade-off between uptake and selectivity for Xe/Kr separation. has highest Xe of 4.05 mmol/g at 0.2 bar 298 K. high Henry IAST 13.6 16.1 separation is achieved by synergy optimal pore size OMSs. Efficient Xenon (Xe) krypton (Kr) important in gas industries but remains challenging. Adsorptive affords an energy-efficient method to isolate two noble gases, yet developing select...

The origin of the terrestrial atmosphere is one of the most puzzling enigmas in the planetary sciences. It is suggested here that two sources contributed to its formation, fractionated nebular gases and accreted cometary volatiles. During terrestrial growth, a transient gas envelope was fractionated from nebular composition. This transient atmosphere was mixed with cometary material. The fracti...

Results on nakhlite Martian meteorites and on ALHA84001 have led to a debate on the noble gas components contributing to the inventory of these meteorites and the ways to introduce them [1-7]. In a diagram Xe/Xe vs. Kr/Xe they fall off the mixing line Martian interior – Martian atmosphere tending towards lower Kr/Xe-ratios. This was discussed already in 1988 by [8], who suggested incorporation ...

The properties of noble gas systems can be greatly extended by heterogeneous mixtures of elements. The geometrical structures and energies of mixed Ar-Kr-Xe clusters were investigated using ternary Lennard-Jones (TLJ) potential. For the Ar19Kr n Xe19, Ar19Kr19Xe n , and Ar n Kr19Xe19 (n = 0-17) clusters investigated, the results show that only two minimum energy configurations exist, i.e., poly...

To understand the tribological properties of Ne and Kr on Pb(111), the potential energy surfaces for sliding motion of Ne, Kr, and Xe monolayers on the Pb(111) surface are examined through density functional calculations, using either local density or self-consistent nonlocal van der Waals functionals. The calculated adsorption energy for Xe/Pb(111) agrees well with experiment, validating the p...

Krypton-81m and Xe-133 ventilation scintigrams, and particulate per fusion scintigrams with Tc-99m, were obtained on the same day in 41 pa tients. Of 14 studies demonstrating pulmonary embolism, Kr-81m corn plernented the perfusion study better than Xe-133 in seven and was judged essential for that diagnosis in two. Xenon-133 was better in none. On the other hand, in 29 studies with obstructive...

Emission lines from transitions between high-energy states of noble-gas atoms (Ne, Ar, Kr, and Xe) and ions (Ar(+), Kr(+), and Xe(+)) formed and excited during single-bubble cavitation in sulfuric acid are reported. The excited states responsible for these emission lines range 8.3 eV (for Xe) to 37.1 eV (for Ar(+)) above the respective ground states. Observation of emission lines allows for ide...

This study collects information from absorption and luminescence excitation spectra recorded for Mn atoms isolated in the solid rare gases Ar, Kr, and Xe and presents an analysis of the site occupancy, based on the polarizabilities of the rare gases and the observed spectral shifts. Two thermally stable sites of isolation exist for atomic Mn in solid Ar and Kr, while a single thermally stable s...

We have developed an atom trap trace analysis (ATTA) system to measure Kr in Xe at the part per trillion (ppt) level, a prerequisite for the sensitivity achievable with liquid xenon dark matter detectors beyond the current generation. Since Ar and Kr have similar laser cooling wavelengths, the apparatus has been tested with Ar to avoid contamination prior to measuring Xe samples. A radio-freque...