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用高分辨电子能量损失谱 ( HREEL S) ,研究了 Rh( 10 0 ) c( 2× 2 ) Mn表面合金的氧化及 CO在清洁和氧化表面合金上的吸附 .结果表明 ,在 Rh( 10 0 ) c( 2× 2 ) Mn氧化过程中 ,发生 Mn的偏析 ,Mn被氧化生成 Mn O薄层 .Mn- O- Rh间的强相互作用 ,使部分锰氧化物在 12 0 0 K下存在于 Rh( 10 0 )表面 .若这种表面在 70 0～ 80 0 K继续被氧化 ,可得到 Mn O1 + x/ Rh( 10 0 ) ;Mn O1 + x/ Rh( 10 0 )在 5 0 0～ 60 0 K还原后生成 Mn O/ Rh( 10 0 ) . CO吸附于Rh ( 10 0 ) c( 2× 2 ) Mn中 Rh原子的顶位 ,C- O键级比清洁 Rh( 10 0 )顶位吸附的 CO键级略低 . Mn O/ Rh( 10 0 )和Mn O1 + x/ Rh( 10 0 )上 CO吸附于经还原的、未被锰氧化物覆盖的 Rh( 10 0 )区域 ,CO与锰氧化物间可发生相互作用 .
The oxidation of CO (2 × 2) Mn and the adsorption of CO onto the cleaned and oxidized surface alloy were investigated by high resolution electron energy loss spectroscopy (HREEL S) ) During the oxidation of c (2 × 2) Mn, the segregation of Mn occurs and the Mn is oxidized to form a thin layer of Mn O. The strong interaction between Mn and O-Rh allows some of the manganese oxide to be present at 1200 K Rh (10 0). If the surface is continuously oxidized at 70 0 ~ 80 0 K, Mn O 1 + x / Rh (10 0) The formation of Mn O / Rh (10 0) after reduction at 60 0 K adsorbed on the top of the Rh atom in Rh (10 0) c (2 × 2) Mn, CO bond was slightly lower at the site of adsorption.The CO adsorbed on the MnO / Rh (10 0) and Mn O1 + x / Rh (10 0) was adsorbed on the reduced Rh (10 0) region not covered by manganese oxide, Interaction between CO and manganese oxide may occur.