Fluorine

F 1s binding energy values.
Notes: [1] lists -CH2CHFCH2- (PVF) at 686.94 eV, (-CF2-CF2-)n (PTFE) at 689.67 eV, and OOCCF3 (PVTFA) at 688.16 eV.

Reference:
[1]  G. Beamson, D. Briggs, High Resolution XPS of Organic Polymers - The Scienta ESCA300 Database Wiley Interscience, 1992.