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Argonne Pixel Tracking Telescope at the Fermilab Test Beam Facility

The Argonne Pixel Tracking Telescope is installed at the Fermilab Test Beam Facility. The telescope consists of six planar n + -in-n silicon sensors with a pixel size of 250 × 50 μm 2 . The instrumentation of the telescope is described including the electrical and mechanical setups. A 120 GeV proton beam is used to evaluate the telescope performance using criteria such as cluster size, pixel tracking efficiency, and spatial resolution. The spatial resolution of the telescope is measured to be 72 μm × 13 μm and is consistent with the resolution determined from the simulation. In conclusion, this telescope will be used to test the performance of the various silicon pixel technology as well as to study the effects and the performance of the detectors after being irradiated.

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND ↗

Coordination Chemistry of Solvated Metal Ions in Soft Donor Solvents

The structures of hexaammine solvated indium(III) and thallium(III) ions in liquid ammonia solution are determined by EXAFS. Both complexes have regular octahedral coordination geometry with mean In-N and Tl-N bond distances of 2.23(1) and 2.29(2) Å, respectively. Ammine solvated thallium(III) in liquid ammonia is characterized with 205Tl NMR measurements. Solvents such as liquid ammonia, N,N-dimethylthioformamide (DMTF), trialkyl and triphenyl phosphite and phosphine are strong electron pair donors and thereby able to form bonds with a large covalent contribution with strong electron pair acceptors. A survey of reported structures of ammine, DMTF, trialkyl and triphenyl phosphite and phosphine solvated metal ions in the solid state and solution is presented. The M-N and M-S bond distances in ammine and DMTF solvated metal ions are compared with the M-O bond distance in the corresponding metal ion hydrates, expected to form mainly electrostatic interactions with metal ions. The d10 metal ions have high ability to form bonds with a high degree of covalency with increasing ability down the group and with decreasing charge of the metal ion. The difference in M-N and M-O bond distances between ammine solvated and hydrated metal ions with the same coordination geometry decreases significantly with the increasing ability of the metal ion to form bonds with a large covalent contribution. This difference correlates well with the covalent bonding index, γM2*r.

Biochemistry & Molecular Biology↗

Materials Data on InN by Materials Project

InN is Wurtzite structured and crystallizes in the hexagonal P6_3mc space group. The structure is three-dimensional. In3+ is bonded to four equivalent N3- atoms to form corner-sharing InN4 tetrahedra. There are three shorter (2.18 Å) and one longer (2.20 Å) In–N bond lengths. N3- is bonded to four equivalent In3+ atoms to form corner-sharing NIn4 tetrahedra.

36 MATERIALS SCIENCE↗

Materials Data on InN by Materials Project

InN is Zincblende, Sphalerite structured and crystallizes in the cubic F-43m space group. The structure is three-dimensional. In3+ is bonded to four equivalent N3- atoms to form corner-sharing InN4 tetrahedra. All In–N bond lengths are 2.19 Å. N3- is bonded to four equivalent In3+ atoms to form corner-sharing NIn4 tetrahedra.

36 MATERIALS SCIENCE↗

Materials Data on InN by Materials Project

InN is Halite, Rock Salt structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. In3+ is bonded to six equivalent N3- atoms to form a mixture of corner and edge-sharing InN6 octahedra. The corner-sharing octahedral tilt angles are 0°. All In–N bond lengths are 2.35 Å. N3- is bonded to six equivalent In3+ atoms to form a mixture of corner and edge-sharing NIn6 octahedra. The corner-sharing octahedral tilt angles are 0°.

36 MATERIALS SCIENCE↗

Materials Data on InN3 by Materials Project

InN3 is Uranium Silicide structured and crystallizes in the orthorhombic Pmm2 space group. The structure is three-dimensional. In3+ is bonded to twelve N1- atoms to form a mixture of face and corner-sharing InN12 cuboctahedra. There are two shorter (2.48 Å) and ten longer (2.49 Å) In–N bond lengths. There are three inequivalent N1- sites. In the first N1- site, N1- is bonded in a distorted rectangular see-saw-like geometry to four equivalent In3+ atoms. In the second N1- site, N1- is bonded in a distorted square co-planar geometry to four equivalent In3+ atoms. In the third N1- site, N1- is bonded in a distorted square co-planar geometry to four equivalent In3+ atoms.

36 MATERIALS SCIENCE↗