Carbon and oxygen K-edge photoionization of the CO molecule

High-resolution, high-intensity photoionization studies were performed near the carbon and oxygen K-edges of gas-phase CO. At least 37 absorption lines were resolved at the carbon K-edge, and new information was obtained about the π*, Rydberg, and double-excitation resonances, including Rydberg states up to n=7 and vibrational transitions up to v′ = 3. Vibrational structure in oxygen is 1s−1π* and Rydberg states was resolved for the first time. The derived molecular structure parameters are consistent with the Z+1 approximation. High-resolution, high-intensity core-level photoabsorption promises new opportunities in vibrational state-to-state chemistry and surface science.