Unusual hydrogen atom display in solid acids

Abstract

Studying crystal structures of superprotonic phases of alkali metal hydrogen sulfates and selenates, a very unusual phenomenon has been revealed. Dynamically disordered hydrogen atoms with low position occupancies are clearly seen in corresponding electron density maps. To explain this effect, an idea about a new type of twinning, dynamic twinning, was proposed and discussed.

3 pages, 2 figures. March 30, 2009 - accepted in Acta Cryst. B. May 11, 2009 - declined by C.P. Brock, the Section Editor