ISSN:
1600-5724
Source:
Crystallography Journals Online : IUCR Backfile Archive 1948-2001
Topics:
Chemistry and Pharmacology
,
Geosciences
,
Physics
Notes:
A new two-wavelength Bijvoet-pair method is proposed, which allows unique experimental determination of anomalous phases without absorption correction and scaling of the Bragg intensities, if the resonant atom structure is known. The method consists of measuring Bijvoet ratios at two wavelengths λ1 and λ2, for which the real and imaginary dispersion terms in the anomalous scattering amplitude fulfil the conditions: b′A(λ1) = -b′A(λ2) and b′′A(λ1) = b′′A(λ2). These conditions can be fulfilled with resonant neutron scattering by nuclei like 113Cd, 149Sm or 157Gd, but not with resonant X-ray or Mössbauer γ-ray scattering. A first application of the method to experimental phase determination for a small structure, Cd-histidine, is described.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1107/S0567739478001539
