Figure 4.

(a) Angle-dependence of C K-edge NEXAFS spectra for the aligned PPP chains on Au(887). The spectra were collected with the polarization in the plane defined by the surface normal and the [112̅] direction (perpendicular to the chains) and Θ is defined as the angle between the polarization and the surface normal (see Figure S5). (b) Angular dependence of the π₁^* resonance intensity compared to the calculated behavior for different tilt angles of the phenyl rings. The calculated curves have been normalized to the first experimental value at θ = 30° for better comparison.