Y. Travaly et al., Calculation of C 1s core-level shifts in poly(ethylene terephthalate) and comparison with x-ray photoelectron spectroscopy, PHYS REV B, 61(11), 2000, pp. 7716-7721
Using a first-principle approach, we investigate the C 1s core-level shifts
of poly(ethylene terephthalate). The geometrical structure of the polymer
is first fully relaxed, then the C 1s core-level shifts are obtained using
an approach that includes core-hole relaxation. We compute shifts without g
eometry relaxation of the excited system, as well as with this relaxation,
and find that one of the relative core-level shifts is affected by as much
as 0.7 eV by this choice. We compare our ab initio core-level shifts with e
xperimental x-ray photoelectron spectroscopy measurements.