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![[Figure 4]](co5014fig4mag.jpg)
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Figure 4
XPS spectra for the C 1s region from calcite crystal surfaces treated differently. The red line belongs to the dosed in situ ethanol monolayer, the black to the surface radiated for 8 h and the green line to the surface non-exposed to X-rays. The peak at 285.5 eV represents the energy of the core electrons from C involved in C—H and C—C bonds, indicating the presence of ethanol molecules and also adventitious carbon. The peak at 287.1 eV (red) represents CH2—OH bonds from the dosed ethanol and the peak at 287.5 eV (black) is for any C—O (e.g. C—OH or C—O—O). The differences in the C—O peak from the radiated area (black) compared with the two other spectra indicate that there is more OH bonding than in a standard calcite–ethanol interface, i.e. from ethanol or ethanol residue, and that it is attached via stronger bonds. |
![[Figure 4]](co5014fig4.jpg)
 | JOURNAL OF SYNCHROTRON RADIATION |
ISSN: 1600-5775
