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Four distinct Pd/O states have been observed on Pd(111) in surface science
experiments:
1. Undissociated O2 adsorption (only much lower than room temperature).
2. Atomic O adsorbed on top of the metal surface.
3. Two states (one metastable) simultaneously formed with the same
desorption characteristics, one 2-fold symmetric, the other 4-fold symmetric.

4. Crystalline PdO.

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