نتایج جستجو برای: xe and kr
تعداد نتایج: 16829018 فیلتر نتایج به سال:
The many-body-theory approach to positronium-atom interactions developed in [Phys. Rev. Lett. \textbf{120}, 183402 (2018)] is applied the sequence of noble-gas atoms He-Xe. Dyson equation solved separately for an electron and positron moving field atom, with entire system enclosed a hard-wall spherical cavity. two-particle give energies wave functions Ps eigenstates From these, we determine sca...
Laser-induced excitation spectra recorded for the electric-quadrupole 3d(6)4s a6D(J)<--3d(5)4s2a6S(5/2) transitions of atomic Mn, allow assignment of the red emission features, previously observed in Mn/RG (RG=Ar, Kr and Xe) matrices with resonance 3d(5)4s4pz6P(5/2)<--3d(5)4s2 a6S(5/2) excitation, to the metastable a6D(9/2) state. Narrow excitation bands recorded for the red site in the Mn/Kr s...
The structures of metal–organic frameworks (MOFs) can be tuned to reproducibly create adsorption properties that enable the use these materials in fixed-adsorption beds for non-thermal separations. However, with millions possible MOF structures, challenge is find best separate a given mixture. Thus, computational, rather than experimental, screening necessary identify promising merit further ex...
High resolution spectra of (CO2)2-Rg trimers (Rg = Ne, Ar, Kr, and Xe) in the region CO2 ν3 fundamental (≈2350 cm−1) are reported, using a tunable OPO laser source to probe pulsed supersonic slit jet expansion. These transitions tend be hidden among stronger due other species, such as CO2-Rg (CO2)2. Each trimer consists (CO2)2 unit which is similar free carbon dioxide dimer (planar parallel sta...
Spectroscopy of planetary nebulae (PNe) provides the means to investigate s-process enrichments of neutron(n)-capture elements that cannot be detected in asymptotic giant branch (AGB) stars. However, accurate abundance determinations of these elements present a challenge. Corrections for unobserved ions can be large and uncertain, since in many PNe only one ion of a given n-capture element has ...
We report thermal rate coefficients for 12 reactions of rare gas cations (Ne(+), Ar(+), Kr(+), Xe(+)) with halide anions (Cl(-), Br(-), I(-)), comprising both mutual neutralization (MN) and transfer ionization. No rate coefficients have been previously reported for these reactions; however, the development of the Variable Electron and Neutral Density Attachment Mass Spectrometry technique makes...
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