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Figure 1
Photoreduction of the ferric haem of AXCP crystals by excitation with a 405 nm laser. (a, b) No photoreduction is observed at low laser power densities from 1.6 to 4.0 mW mm−2 at the start of (blue spectra) and after (red spectra) the kinetic series. (c) Higher laser density powers (>4.0 mW mm−2) result in clear photoreduction of the Fe, as shown by the split of the ν4 marker at 1368 cm−1 and interconversion into the 1351 cm−1 peak, which is evidence for the ferrous state of the haem Fe. (d) This interconversion and the presence of only the 1351 cm−1 band are strong evidence of complete reduction and occur more rapidly at higher power densities such as 9.8 mW mm−2. The blue spectrum represents the first spectrum of the first kinetic series and the red spectrum represents the last spectrum of the last kinetic series.

IUCrJ
Volume 4| Part 3| May 2017| Pages 263-270
ISSN: 2052-2525
https://doi.org/10.1107/S2052252517002159