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By tuning the laser photon energy in the non-linear two-photons photoemission at a single-layer graphene/Cu(111) interface, it is possible to observe a strong resonance at hυ=3.5eV along with a weaker one at hυ=3.85eV. The main resonance photon energy is consistent with a direct optical transition between the occupied Cu(111) Shockley surface state and the n=1 image potential state, located in the...
A UV-Vis and Raman spectroscopy study of three aminochromes generated through Mn 3+ oxidation of the dopamine, l-dopa and adrenaline molecules at physiological pH was performed. The UV-Vis spectra of the catecholamines oxidized using Mn 3+ in buffer solution at pH 7.2 show a band at ca. 300 nm, formed by two transitions at 280 nm and 300 nm assigned to an L a and L b ...
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