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OFDR signals from spun fibers contain frequency components related to a beating between effective beat length and spin period. Agreement between simulation and measured data allows correct extraction of spin period and effective beat length
The structure of phase IV of methylammonium lead bromide, CH 3 ND 3 PbBr 3 , is shown from Rietveld refinement of neutron powder diffraction data to be centrosymmetric, with space group Pnma: Z=4; a=7.9434(4)A, b=11.8499(5)A, c=8.5918(4)A at 11K; R wp =2.34% R p =1.81%. This corresponds to one of the pure tilt transitions, a - b + a ...
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