Figure 3: Photoabsorption spectra depending on the light polarization.
From: Direct observation of spin-forbidden transitions through the use of suitably polarized light
Theoretical photoabsorption spectra obtained from the Fourier transform of the autocorrelation function from a wavepacket propagation for 1 ps (except for x-polarization for which we used diagonalization due to the weakness of the spectrum in comparison to the singlet one (a). A damping function of 300 fs is used to reproduce the experimental linewidth. (a) Full spectrum in the range 3.15–5.5 eV, with the Clements bands resulting from the singlet states (E>3.7 eV). Frames b–d present the spectra of the triplet states (three orders of magnitude lower in intensity) after alignment of the molecules and for x-, y- and z-polarized light, respectively. The theoretical spectrum (blue line) of d is superimposed with the experimental spectrum (red line) of Vandaele et al.4, showing very good agreement.
