Peak positions and areas of O1s before and after adsorption by IP and PI.
| Peak position (eV) | Group | Peak area percentage (%) | |
|---|---|---|---|
| IP | 530.1 | Lattice-O2− | 65.62 |
| 531.4 | –OHlat | 34.38 | |
| IP–TC | 530.1 | Lattice-O2− | 62.22 |
| 531.4 | –OHlat/–OH from TC | 27.52 | |
| 532.8 | C–O from TC | 10.26 | |
| IP–LEV | 530.0 | Lattice-O2− | 67.55 |
| 531.3 | –OHlat/–OH from LEV | 26.62 | |
| 533.0 | O C–O/C–O from LEV | 5.830 | |
| PI | 530.1 | Lattice-O2− | 6.442 |
| 531.1 | –OHlat | 7.372 | |
| 532.3 | –OHads | 58.65 | |
| 533.6 | H2O | 27.54 | |
| PI–TC | 530.2 | Lattice-O2− | 8.755 |
| 531.6 | –OHlat/–OH from TC | 18.00 | |
| 532.3 | –OHads | 43.41 | |
| 533.5 | H2O | 29.84 | |
| PI–LEV | 530.0 | Lattice-O2− | 9.012 |
| 531.2 | –OHlat/–OH from LEV | 18.94 | |
| 532.2 | –OHads | 44.69 | |
| 533.5 | H2O | 27.36 |