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All sourcesNASA NTRSDOE OSTI
DOE OSTI2020

Materials Data on MoPd by Materials Project

PdMo is alpha La-derived structured and crystallizes in the trigonal R-3m space group. The structure is three-dimensional. there are three inequivalent Mo sites. In the first Mo site, Mo is bonded to six equivalent Mo and six equivalent Pd atoms to form MoMo6Pd6 cuboctahedra that share corners with twelve MoMo6Pd6 cuboctahedra, edges with twelve MoMo6Pd6 cuboctahedra, edges with twelve equivalent PdMo6Pd6 cuboctahedra, faces with six equivalent MoMo6Pd6 cuboctahedra, and faces with twelve equivalent PdMo6Pd6 cuboctahedra. All Mo–Mo bond lengths are 2.78 Å. All Mo–Pd bond lengths are 2.82 Å. In the second Mo site, Mo is bonded to six equivalent Mo and six Pd atoms to form MoMo6Pd6 cuboctahedra that share corners with five equivalent PdMo6Pd10 cuboctahedra, corners with twelve MoMo6Pd6 cuboctahedra, edges with ten PdMo6Pd6 cuboctahedra, edges with twelve MoMo6Pd6 cuboctahedra, faces with six equivalent MoMo6Pd6 cuboctahedra, and faces with fifteen PdMo6Pd6 cuboctahedra. All Mo–Mo bond lengths are 2.78 Å. All Mo–Pd bond lengths are 2.82 Å. In the third Mo site, Mo is bonded to six equivalent Mo and six Pd atoms to form MoMo6Pd6 cuboctahedra that share corners with five equivalent PdMo6Pd10 cuboctahedra, corners with twelve MoMo6Pd6 cuboctahedra, edges with ten PdMo6Pd6 cuboctahedra, edges with twelve MoMo6Pd6 cuboctahedra, faces with six equivalent MoMo6Pd6 cuboctahedra, and faces with fifteen PdMo6Pd6 cuboctahedra. All Mo–Mo bond lengths are 2.78 Å. All Mo–Pd bond lengths are 2.82 Å. There are two inequivalent Pd sites. In the first Pd site, Pd is bonded to six Mo and six equivalent Pd atoms to form PdMo6Pd6 cuboctahedra that share corners with twelve PdMo6Pd6 cuboctahedra, edges with twelve MoMo6Pd6 cuboctahedra, edges with twelve PdMo6Pd6 cuboctahedra, faces with six equivalent PdMo6Pd6 cuboctahedra, and faces with twelve MoMo6Pd6 cuboctahedra. All Pd–Pd bond lengths are 2.78 Å. In the second Pd site, Pd is bonded to six Mo and ten equivalent Pd atoms to form PdMo6Pd10 cuboctahedra that share corners with ten MoMo6Pd6 cuboctahedra, corners with twelve PdMo6Pd6 cuboctahedra, edges with eight MoMo6Pd6 cuboctahedra, edges with sixteen PdMo6Pd6 cuboctahedra, faces with sixteen equivalent PdMo6Pd10 cuboctahedra, and faces with eighteen MoMo6Pd6 cuboctahedra. There are a spread of Pd–Pd bond distances ranging from 2.78–5.55 Å.

36 MATERIALS SCIENCE↗
DOE OSTI2020

Materials Data on MoPd by Materials Project

PdMo is Magnesium-derived structured and crystallizes in the hexagonal P-6m2 space group. The structure is three-dimensional. Mo is bonded to six equivalent Mo and six equivalent Pd atoms to form MoMo6Pd6 cuboctahedra that share corners with eighteen equivalent MoMo6Pd6 cuboctahedra, edges with six equivalent MoMo6Pd6 cuboctahedra, edges with twelve equivalent PdMo6Pd6 cuboctahedra, faces with eight equivalent MoMo6Pd6 cuboctahedra, and faces with twelve equivalent PdMo6Pd6 cuboctahedra. All Mo–Mo bond lengths are 2.79 Å. All Mo–Pd bond lengths are 2.80 Å. Pd is bonded to six equivalent Mo and six equivalent Pd atoms to form PdMo6Pd6 cuboctahedra that share corners with eighteen equivalent PdMo6Pd6 cuboctahedra, edges with six equivalent PdMo6Pd6 cuboctahedra, edges with twelve equivalent MoMo6Pd6 cuboctahedra, faces with eight equivalent PdMo6Pd6 cuboctahedra, and faces with twelve equivalent MoMo6Pd6 cuboctahedra. All Pd–Pd bond lengths are 2.79 Å.

36 MATERIALS SCIENCE↗
NASA NTRS1991

Detection of earth-approaching asteroids in near real time

Computer software, called the Moving Object Detection Program (MODP), is described which detects earth-approaching asteroids in near real time. The software runs on a workstation linked to the output of the drift-scanning CCD camera of the Spacewatch Telescope. MOPD recognizes trailed images, detects motion, and accurately determines angular positions and rates of motion for moving objects in the scan images. The results are obtained a few seconds after the image signals are shifted out of the CCD. During 2 months of trial observations with this system, 304 asteroids were detected down to a limiting apparent magnitude for untrailed images of V = 20.5.

Rabinowitz, D. L.↗