Probing the switching state of a surface-mounted azobenzene derivative using femtosecond XUV photoemission
2012
Photoemission spectroscopy using femtosecond XUV light pulses is applied to probe the isomerization state of the
molecular switch 3-(4-(4-hexyl-phenylazo)-phenoxy)-propane-1-thiol deposited by liquid phase self-assembly on
Au(111). Spectral shifts of valence-electronic signatures that we associate with the carbon C2s orbital enable us to
distinguish the trans and the cis isomerization state of the adsorbed molecules. These preliminary results envision the
potential to probe reversible switching processes of surface-mounted molecules in real time by tracking the temporal
evolution of the electronic and nuclear degrees of freedom in a femtosecond XUV photoemission experiment.
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