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Freeze Fracture Transmission Electron Microscopy (FFTEM) study of thenanoscale structure of the so-called "twist-bend" nematic (NX) phase of thecyanobiphenyl (CB) dimer molecule CB(CH2)7CB reveals a stripe texture of fluidlayers periodically arrayed with a bulk spacing of d ~ 8.3 nm. Fluidity and arigorously maintained spacing produce long-range-ordered fluid layered focalconic domains. Absence of a lamellar x-ray reflection at wavevector q ~2{\pi}/8 nm-1 or its harmonics in synchrotron-based scattering experimentsindicates that this periodic structure is achieved with no detectableassociated modulation of the electron density, and thus has nematic molecularordering. A search for periodic ordering with d ~ 8nm in CB(CH2)7CB usingatomistic molecular dynamic computer simulation yielded equilibration of aconical twist-bend helixed nematic ground state, of the sort first proposed byMeyer, and envisioned in systems of bent molecules by Dozov and Memmer, Weidentify {\theta} ~ 33 degree as the cone angle, and p ~ 8nm as the full pitchof the helix, the shortest ever found in a nematic fluid.

A Twist-Bend Chiral Helix of 8nm Pitch in a Nematic Liquid Crystal of Achiral Molecular Dimers