2. 3. XANES and FTIR
XANES and FTIR measurements were performed at
beamline ID21 of the European Synchrotron Radiation
Facility (ESRF), Grenoble, France. XANES spectra were
collected in fluorescence mode on selected points of the
sample with the beam size of 0.2 µm x 0.8 µm. Measurements
were made using X-rays with tuneable energy in the range
from 3.32 to 3.47 keV, with a 0.225 eV energy step and 0.1 s
dwell time.
FTIR spectra were collected in transmission mode, with
a resolution of 4 cm-1. The beam size was 6 µm x 6 µm,
imprinting on specimens deposited on 0.2 mm thickness BaF2
windows. Specimens were scanned with steps of 4 µm in both
directions. For each spectrum, 64 scans were accumulated
from 4000 to 500 cm-1 and averaged. Background spectra
were collected every 30 minutes.