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(Peer-Reviewed) Hot electron electrochemistry at silver activated by femtosecond laser pulses
Oskar Armbruster ¹ ², Hannes Pöhl ², Wolfgang Kautek ²
¹ University of Natural Resources and Life Sciences, Vienna, Department of Bionanosciences, Muthgasse 11, 1190 Vienna, Austria
² University of Vienna, Department of Physical Chemistry, Währinger Straße 42, 1090 Vienna, Austria
Opto-Electronic Advances, 2023-06-25
https://doi.org/10.29026/oea.2023.220170
https://www.oejournal.org/article/doi/10.29026/oea.2023.220170
Abstract

A silver microelectrode with a diameter of 30 µm in an aqueous K2SO4 electrolyte was irradiated with 55 fs and 213 fs laser pulses. This caused the emission of electrons which transiently charged the electrochemical double layer. The two applied pulse durations were significantly shorter than the electron-phonon relaxation time.

The laser pulse durations had negligible impact on the emitted charge, which is incompatible with multiphoton emission. On the other hand, the observed dependence of emitted charge on laser fluence and electrode potential supports the thermionic emission mechanism.
Hot electron electrochemistry at silver activated by femtosecond laser pulses_1
Hot electron electrochemistry at silver activated by femtosecond laser pulses_2
Hot electron electrochemistry at silver activated by femtosecond laser pulses_3
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