What is the reason of the shallow dip below the absorption edge of carbon in C K-edge XANES spectra of boron carbide (B4C) in TEY mode?

Actually I measured C K-edge XANES in Total Electron Yield mode (TEY). In the XANES spectrum I observed a shallow dip, 3 eV bellow from the absorption edge in boron carbide thin film which is...

01 January 2015 2,187 4 View