Anisotropic structure analysis for Mo oxides on TiO2(110) single crystal surface by polarization-dependent total-reflection fluorescence EXAFS

We have carried out the three-dimensional structure analysis for Mo oxides on TiO2(110) using total-reflection fluorescence EXAFS (extended X-ray absorption fine structure) in three different directions of the polarized vector of the incident X-rays parallel to the [11̄0], [001] and [110] directions of the TiO2(110) plane. It is concluded that the Mo dimer species are selectively formed on the surface, with the Mo–Mo bond (0.335 nm) parallel to the [11̄0] direction and also with Mo–Ti (0.296 nm) and Mo–O (0.220 nm) interfacial bonds.