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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on RePt by Materials Project

PtRe crystallizes in the hexagonal P-6m2 space group. The structure is three-dimensional. Re is bonded to six equivalent Re and six equivalent Pt atoms to form distorted ReRe6Pt6 cuboctahedra that share corners with eighteen equivalent ReRe6Pt6 cuboctahedra, edges with six equivalent ReRe6Pt6 cuboctahedra, edges with twelve equivalent PtRe6Pt6 cuboctahedra, faces with eight equivalent ReRe6Pt6 cuboctahedra, and faces with twelve equivalent PtRe6Pt6 cuboctahedra. All Re–Re bond lengths are 2.79 Å. All Re–Pt bond lengths are 2.77 Å. Pt is bonded to six equivalent Re and six equivalent Pt atoms to form distorted PtRe6Pt6 cuboctahedra that share corners with eighteen equivalent PtRe6Pt6 cuboctahedra, edges with six equivalent PtRe6Pt6 cuboctahedra, edges with twelve equivalent ReRe6Pt6 cuboctahedra, faces with eight equivalent PtRe6Pt6 cuboctahedra, and faces with twelve equivalent ReRe6Pt6 cuboctahedra. All Pt–Pt bond lengths are 2.79 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on RePt(N2Cl3)2 by Materials Project

PtN4ReCl6 is Halite, Rock Salt structured and crystallizes in the orthorhombic Cmce space group. The structure is zero-dimensional and consists of four hexachlororhenium molecules and four tetraaminoplatinum molecules.

36 MATERIALS SCIENCE↗
DOE OSTI2024

The Impact of the 8–10 March 2012 Geomagnetic Storm on Inner Zone Protons as Measured by Van Allen Probes

The Relativistic Electron Proton Telescope (REPT) instrument on the Van Allen Probes observed a double-peaked inner zone proton population throughout the 7 year lifetime of the mission. M. Hudson et al. (2023) showed that a strong SEP event accompanied by a CME-shock in early March 2012 provided the Solar Energetic Proton (SEP) source for the higher L trapped proton population, which then diffused radially inward to be observed by REPT at L = 2. The study followed trajectories of SEP protons launched isotropically from a sphere at 7 Re for 2.5 hr in fields calculated by the LFM-RCM global MHD model, which includes electric fields needed to model the transport and trapping of the protons by the shock, and then a radial diffusion simulation was run for 2 years using the result from the test-particle simulation as the initial condition. The simulation result was compared with REPT measurement in November 2013 and showed reasonable agreement. However, the simulation overestimated the Phase Space Density by a factor of four due to lack of field line curvature scattering during the storm in the model. In this study, a test-particle simulation is performed for 2 days following the injection and trapping of protons in March 2012 using TS05 fields to simulate the field line curvature scattering of the trapped SEP due to the buildup of the ring current during the geomagnetic storm. The resulting sample distribution was then weighted using the flux at the end of the two-hour MHD-test particle simulation. A radial diffusion simulation is then run using the initial profile that included the loss effect, with improved comparison with REPT measurements after 2 years.

79 ASTRONOMY AND ASTROPHYSICS↗