Abstract
Using polarized nature of synchrotron radiation, core electron absorption spectra of thin films of polyethylene terephthalate (PET) and polyethylene naphthalate (PEN) were investigated. Aromatic rings in these films tend to lie in the film plane when the films are drawn uniaxially or, in particular, biaxially; previous interpretation of their core electron spectra based on their nature above was reinforced by recently observed spectra in higher resolution.
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