ქიმიის ტერმინთა განმარტებითი ლექსიკონი

Mesophase of helicoidal supermolecular structure in which blocks of molecules with a local structure of the smectic C type, have their layer normals rotated with respect to each other and are separated by screw dislocations.

Note 1: Two forms of TGBC^* mesophase are possible: in one form the director within the layer is tilted and rotates coherently through the layers in a block as in a chiral smectic C mesophase, while in the other form the director within a block is simply tilted with respect to the layer normal as in a smectic C mesophase.

Note 2: In the case of a short pitch, when P is less than the wavelength λ, the macroscopic extraordinary axis for the refractive index is orthogonal to the director.