Ground-State Reversal by Matrix Interaction: Electronic States and Vibrational Frequencies of CUO in Solid Argon and Neon This work was supported by the National Science Foundation (CHE 97-00116), the US Department of Energy (DE-FG02-86ER13519), and the Los Alamos National Laboratory, and by grants of computer time from the Ohio Supercomputer Center and the Pacific Northwest National Laboratory.