کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5425600 | 1395861 | 2006 | 6 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Adsorption site, core level shifts and charge transfer on the Pd(1 1 1)-I(â3 Ã â3) surface Adsorption site, core level shifts and charge transfer on the Pd(1 1 1)-I(â3 Ã â3) surface](/preview/png/5425600.png)
We use core level photoelectron spectroscopy and density functional theory (DFT) to investigate the iodine-induced Pd(1 1 1)-I(â3 Ã â3) structure formed at 1/3 ML coverage. From the calculations we find that iodine adsorbs preferentially in the fcc hollow site. The calculated equilibrium distance is 2.06 à and the adsorption energy is 68 kcal/mol, compared to 2.45 à and 54 kcal/mol in the atop position. The adsorption energy difference between fcc and hcp hollows is 1.7 kcal/mol. Calculated Pd 3d surface core level shift on clean Pd(1 l 1) is 0.30 eV to lower binding energy, in excellent agreement with our experimental findings (0.28-0.29 eV). On the Pd(1 1 1)-I(â3 Ã â3) we find no Pd 3d surface core level shift, neither experimentally nor theoretically. Calculated charge transfer for the fcc site, determined from the Hirshfeld partitioning method, suggests that the iodine atom remains almost neutral upon adsorption.
Journal: Surface Science - Volume 600, Issue 15, 1 August 2006, Pages 3093-3098