Figure 2.

Imaginary part of the relative dielectric function (upper panel), the index of refraction function (center panel, displayed is actually $n-n_{\infty }$ ) and the index of absorption function (lower panel) for different concentrations between 0.01–0.07 mol L⁻¹ (S*²=9801 L/(mol cm²), ${\tilde{v}}_0=$ 1659 cm⁻¹ γ=20 cm⁻¹).