Molecules in unit cells

V = cell volume in A. Z = numi r of molecules in unit cell. 

Equation II) u,.(R) = z (= 1) Polyatomic molecules in unit cell (molecule) r, Librations (Rotations)... 

If the part of the interaction which depends on electronic spins is not taken into account, the molecule energy level in a triplet state is three-fold degenerate with respect to the molecular spin orientation (M = 0, 1). In this case there are a excitonic bands corresponding to each value of M (a being the number of molecules in unit cell), and the respective wavefunctions have the form... 

In a molecular crystal with a > 1 molecules in unit cell the local field E is different for different molecules a = 1,2,... cr. The relation between the amplitudes of the local and macroscopic fields for a given frequency w can be expressed by the relation... 

Molecules in unit cell not reported not reported not reported... 

Here, Hma is the Hamiltonian of the molecule a in the m-th unit cell of the crystal, describes the pairwise interaction between the molecule a in unit cell m with molecule in unit cell n (cf. the fundamental work of Silbey et al. [22]). With two molecules in the unit cell, the indices a and p mn over these two sites, and m and n ran over aU the N unit cells. 

Phase 21 Structure type 4J r—y f — Space group Number of molecules in unit cell Caleium coordination Lattice constants, nm... 

Crystallinity The long-range regular ordering of atoms or molecules in unit cells on a three-dimensional crystalline lattice. 

D-variation of electron density due to molecules in unit cell structure factor... 

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