Dear EXAFS community,
Hello, everyone, I come to ask for your kind help.
A few days later I will go to synchrotron radiation XAFS beamline to do my first experiment. My study system is CO adsorbed on Ni, Cu and Ag(they are metal thin layers deposited on SiO2/Si substrate, the thickness is ~300nm), the purpose of my study is to learn the interaction between CO and three different metals, to see the CO structure and geometry differences when adsorbed on three different metals.
Then I designed a series of experiments:
1.For metal M atom
(1) XANES
a.with CO adsorption
b.without CO adsorption
The purpose of this experiment is to see the oxidation state change of M atom(compared with the absent of CO adsorption)
(2) EXAFS
a.with CO adsorption
b.without CO adsorption
The purpose of this experiment is to see (1)if there is any structural changes in the metal clusters with and without CO adsorption and (2）the structure and geometry of adsorbed CO.
2. For C atom：EXAFS：to see nearest C-O and C-M structure.
3. For O atom：EXAFS：mainly to see nearest O-C structure.
4. Control EXAFS experiment without sample, but with CO: actually CO structure is simple and there are already theory calculation and experiment information for its structure, so I am wondering if this experiment is still necessary?

Since it is my first time to do XAFS experiment, I am wondering if the above plan is feasible?

Besides, I still have 3 important questions :
(1)In my experiment plan, what is the edge (K or L edge) I should choose for atom’s energy? I saw some paper usually choose K edge for the heavy element and L edges for the light element, so I am wondering what matters when choosing K edge or L edge? And the signal I will gather is fluorescence signal, is it ok for just choose Kα ray of every element?
(2)for metal M atom, I want to do both EXAFS and XANES experiments, then do I need to do them separately choosing different scanning energy range, or scan the whole range once including both EXAFS and XANES range and then separate in the received data?
(3)for sufficient CO adsorption on three metals, what is the better CO inducing pressure and time?

I hope I can get some help by lucky.
Thank you so much.