Dr. Comes’ collaborative paper with Stony Brook University and the University of Virginia focusing on V1-xNbxO2 thin films has been published in Physical Review B. In this paper we look at the effect of alloy composition in these materials and show that niobium ions donate an electron to vanadium, reducing conductivity in films near x = 0.5. Using ultrafast THz spectroscopy and temperature-dependent transport we confirm this for thin films. At Auburn, we used our ion accelerator to perform Rutherford back scattering measurements that confirm the composition of these materials. Thanks to Tami Isaacs-Smith for performing the RBS measurements!