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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. ÌØ±ðÊǵÚ3Ìõ£¬ÆäÖÐ2-fold symmetricÊÇʲôÒâË¼ÄØ£¿foldÔÚÕâÀïÓÐÊ²Ã´ÌØ¶¨µÄÒâÒ壿лл£¡ |
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