The ethylene (C2H4) adsorbed on Ru(10 (1) over bar 10) surface has been stu
died by X-ray photoelectron spectroscopy (XPS), thermal desorption spectros
copy (TDS) and ultraviolet photoelectron spectroscopy (UPS). The results sh
ow that ethylene absorbs in molecular state on Ru(10 (1) over bar 0) surfac
e stably below 200 K. The dehydrogenation of ethylene occurs at 200 K. The
main product of the dehydrogenation of the absorbed ethylene is the acetyle
ne (C2H2). After the dehydrogenation of the absorbed ethylene,the Cls shift
s 0.3 eV to low binding energy lever,and the binding energies of sigma(CC)
and sigma(CH) bond have an increase of 0.5eV and 1.1eV respectively.