Adsorption geometry of C2H4 andC(2)H on Ni(110) surface

作者：Li B^*; Bao SN; Cao PL

来源：Acta Physica Sinica, 2005, 54(12): 5784-5790.

• ethylene (C2H4) and acetylide (CCH)
• pseudo-potential plane-wave method
• adsorption geometry

The favorite adsorption sites of ethylene (C2H4) and acetylide (CCH) on the Ni (110) surface are investigated by the theoretical calculation of the pseudo- potential plane-wave method. At low coverage the ethylene molecule occupies approximately the midway between the short-bridge and atop sites. The C-C axes of molecules are almost parallel to the ridges of the Ni atoms. The tilt angle of C-C axis relative to the Ni surface is about 12 degrees. The C-C bond length is 0.147 nm. At high coverage (0.5 ML), ethylene molecules form a c (2 x 4) phase. The local adsorption sites of two ethylene molecules in a surface unit mesh are found to be quite similar to that at low coverage, but the C-C bond lengths are shorter than that in the case of the low coverage. The adsorption site of acetylide, decomposed from ethylene, is similar to that of the ethylene molecule on the surface, but there is a small displacement towards the atop site, the C-C bond length is 0.131 nm, and the hydrogen atom bonds with the carbon atom at an atop site, the tilt angle of C-H axis relative to the Ni surface is about 45 degrees.

• 出版日期2005-12
• 单位浙江大学