(a) (10 marks) In a TPD experiment, CO is desorbed from a surface that consists of a single overlayer of Ni (111) on a Ru single crystal. The Ni surface density of atoms is 1.57 x 1019 atoms/m. TPD at a heating rate 2 K/s produces a single peak with a maximum at 550 K that was found to be independent of the initial surface coverage. A pre-exponential factor v= 103 s1 can be assumed. Estimate the desorption energy of Co. (b) (15 marks) A sample that exposes the above surface is under conditions where the partial pressure of CO is 0.01 bar and the temperature is 1000 K. The sticking coefficient Se for Co on the surface the is 0.2. Calculate the equilibrium surface coverage co with respect to surface Ni atoms assuming that under these conditions the saturation coverage is 1. The molar mass of CO is 28 g/mol. (If part a was not answered assume a value for the desorption energy). (a) (10 marks) In a TPD experiment, CO is desorbed from a surface that consists of a single overlayer of Ni (111) on a Ru single crystal. The Ni surface density of atoms is 1.57 x 1019 atoms/m. TPD at a heating rate 2 K/s produces a single peak with a maximum at 550 K that was found to be independent of the initial surface coverage. A pre-exponential factor v= 103 s1 can be assumed. Estimate the desorption energy of Co. (b) (15 marks) A sample that exposes the above surface is under conditions where the partial pressure of CO is 0.01 bar and the temperature is 1000 K. The sticking coefficient Se for Co on the surface the is 0.2. Calculate the equilibrium surface coverage co with respect to surface Ni atoms assuming that under these conditions the saturation coverage is 1. The molar mass of CO is 28 g/mol. (If part a was not answered assume a value for the desorption energy)