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Marc Fleurant, Philip Pattison
peak wavelength'. It is shown that a series of absorption spectra recorded on a brominated RNA faithfully monitor the extent of cleavage. The continuous spectral changes during irradiation preserve an
isosbestic point', each spectrum being a linear combination of zero' and
infinite' dose spectra. This easily yields a good estimate of the partial occupancy of bromine at any intermediate dose. The considerable effect on the near-edge features in the spectra of the crystal orientation versus the beam polarization has also been examined and found to be in good agreement with a previous study. Any significant influence of the (C-Br bond/beam polarization) angle on the cleavage kinetics of bromine was also searched for, but was not detected. These results will be useful for standard SAD/MAD experiments and for the emerging radiation-damage-induced phasing' method exploiting both the anomalous signal of an anomalous scatterer and the
isomorphous' signal resulting from its cleavage., ,
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