A colloidal solution of Au 25 (SG) 18 -protected metal gold clusters was electrosprayed. [Au 25 (SG) 18 -6H] 7− was selected, stored in a quadrupole ion trap, and irradiated with a UV−vis tunable laser. The excess charges are due to the deprotonation of six COOH moieties and a net charge of −1 on the Au core. Photoexcitation of this species results in electron detachment. The action spectrum obtained by recording the electron detachment yield as a function of the laser wavelength displays a strong decrease as the photon energy decreases and the onset of a band at around 650 nm. This spectrum is compared with the absorption spectrum recorded for Au 25 (SG) 18 in solution. We also show that electron detachment is a one-photon process and likely involves, at low photon energy, ionization by tunneling through a repulsive coulomb barrier.
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Hamouda et al. (2010) studied this question.
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