Sr₃Ir₂O₇ is an unusual manifestation of a bilayer square lattice of spins (as illustrated at top of the Figure) due to the extended exchange inherent to its 5d electron valence states and their large orbital extent, not only within but also between bilayer planes. As a result, this system potentially exists in a unique parameter space where the strength of magnetic exchange coupling between these planes can approach or exceed the strength of the coupling within them.

This activity also required removing about 17 m of the storage ring where it passed through the center of CLEO, then installing bridge supports and finally re-installing the bridging I-beams, holding the accelerator magnets and vacuum system. All of this was accomplished on schedule in three months. The success of the re-installation is underscored by the fact that positron beam was stored with no adjustments to CESR on the very first attempt!

In response to teachers’ requests, the new Next Generation Science Standards that promote engineering design, and as part of Xraise’s growing mobile science program, the Xraise team developed and launched a prototype traveling Tinker Cart during the spring of 2016. The Cart holds supplies for one class of elementary school students to participate in the science and engineering activities.

Feifei Li¹, Erik Farquhar², and co-workers published, “Cobalt Kβ Valence-to-Core X-ray Emission Spectroscopy: A Study of Low-Spin Octahedral Cobalt(III) Complexes” in Dalton Transactions 45, 14191-14202 (2016).

Congressman Tonko represents New York’s 20th Congressional District, and as a member of the Science, Space and Technology Committee, Paul serves on the Subcommittee on Research and Technology, which has jurisdiction over non-defense federal scientific research and development. This alignment, and Tonko’s work toward STEM Education, and engineering education in schools makes him a perfect guest for the Cornell High Energy Synchrotron Source, a National Science Foundation funded laboratory.

However, typical thermal annealing is slow, and polymers may degrade at high annealing temperature. Recently a group at Cornell University devised a scheme for ultrafast heating of polymer films using laser spike annealing [1]. Alan Jacobs from Mike Thompson’s group and Clemens Liedel from Chris Ober’s group, both at the Department of Materials Science and Engineering, brought samples to CHESS D1 station for a detailed analysis of laser annealed traces.

The materials would include donated recyclables already available at the reinvention station at the Sciencenter as well as materials provided by Xraise, including hobby motors, batteries, LED's, electrical tape and other miscellaneous items. Guests would be free to play and build whatever they would like, with the activity being open-ended and entirely creative. In order for such an initiative to be successful, staff at both organizations would need to rely on the oversight of a dedicated set of volunteers.

Because of the self-limiting reactions, atomic layer deposition (ALD) offers high conformality which is greatly desired as the critical features in these nanostructures are approaching atomic dimensions. The structural characterization of these nanoscale structures and thin films require use of synchrotron sources such as CHESS which could provide orders of magnitude higher brilliance leading to faster, high-quality diffraction experiments usually not available at a laboratory setup.

For the past year, Louisa has been working with X-ray fluorescence to scan manuscripts from the Johnson Museum, mining deposits from deep below earth, and other samples to train users on the benefits of using the high energy x-rays at CHESS to peer inside, or through their samples.

The intense push in the subsequent month and a half – involving virtually all of the CHESS technical staff – completed the biggest and most significant upgrade to G-line since 2004.