Dynamic crystallography. Redefining the structure of liquid

In the last 100 years the field of crystallography made enormous contributions to condensed matter physics and materials science through determining the atomic structure of crystalline and non-crystalline materials including liquids by diffraction measurement. However, in modern times as the attention shifts from the static structure to dynamic structure crystallography should respond to this change. In particular, because liquid is intrinsically dynamic the definition of its structure ought to include dynamics. In this article I discuss how the crystallographic approach can be widened to include dynamics, focusing on liquids and related soft-matter. (author)