ELFT HÍRADÓ

[Szeminárium koordinátor <sem-admin AT wigner.hun-ren.hu>]

SZFI SeminarJóvári PálHUN-REN Wigner RCP SZFI100 Years of the Pair 
Distribution FunctionTuesday, 21 April 2026, 10:00, KFKI Campus, Bldg. 1, 2nd 
floor, Conference RoomThe intensity of X-rays scattered by randomly oriented 
molecules was given by Debye in 1915. The extension of his results to bulk 
samples (Zernike and Prins, 1926) led to the concept of pair distribution 
function (PDF), a quantity connecting diffraction data with the microscopic 
structure of matter. Though it was rediscovered from time to time PDF never 
played an important role in materials science. The situation changed with the 
appearance of fast 2D x-ray detectors enabling rapid data collection at 
synchrotron sources.In this presentation I will give a brief historical 
overview of the most important PDF-related experimental methods (X-ray and 
neutron diffraction). The inherent experimental and theoretical limitations 
of pair correlation-based description of disordered materials will be 
discussed. The type and depth of structural information provided by PDF will 
also be illustrated by examples. Minden érdeklődőt szívesen látunk! - 
Everyone is welcome to attend.Tamás Pusztaisem-admin AT wigner.hun-ren.hu