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| binding energy/eV | fwhm/eV | area/% | compound | |
|---|---|---|---|---|
| C 1s | 284.8 | 1.4 | 48.5 | C–C, C–H |
| 286.2 | 1.9 | 22.7 | C–O | |
| 287.6 | 2.0 | 8.1 | C=O | |
| 289.1 | 1.3 | 20.7 | COO– | |
| O 1s | 531.8 | 1.1 | 10.6 | C=O |
| 532.7 | 2.2 | 75.9 | C–O– | |
| 533.8 | 1.6 | 13.5 | COO– |
