Figure 2. Theoretically DFT-LDA calculated dispersion relations for LT tetracene along the principal symmetry directions and some other points in BZ along the path described in Figure 2. The intermolecular modes in (a) and (b) are at ambient pressure and under hydrostatic pressure of 280MPa, respectively. The intermolecular and low-laying intramolecular modes in (c) and (d) are at ambient pressure and under hydrostatic pressure of 280MPa, respectively. The high symmetry points of the BZ are labelled relative to the cell vectors according to reference [37].
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