XPS and ESR of SnSe₂-1 % P(CoCp₂)_0.36

We have measured the Co 2p_3/2X-ray photoelectron (XPS) spectrum of SnSe₂-1%P(CoCp₂)_0.36as a function of time and have found that the Co 2p_3/2profile changes with time. This indicates that SnSe₂-1%P(CoCp₂)_0.36undergoes radiation damage as a result of X-ray exposure. Consideration of this damage is important when attempting to use XPS as a measure of the Co²⁺/Co³⁺ratio is this material. Our X-band ESR spectra of SnSe₂-1%P(CoCp₂)_0.36are consistent with the presence of neutral cobaltocene in this material. Quantitative agreement between the XPS and ESR results is achieved when the temporal change in the XPS line shape is modeled using second-order kinetics.