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Chemical BondingThe curve fitting of the mainhydrocarbon line (C x H y ) revealschemical shifts corresponding to• Ether and alcohol groups (C-O at 1.55eV higher BE),• Carbonyl groups (C=O at 2.8 eVhigher),• Ester and acid functional at 4.2 eV• Carbonate groups at 5.2 eV higherBE.Finally, the π- π* satellite at 291.5 eVappears at the extreme left.