Electrochemical switching of positronium triplet quenching

Switching of positronium triplet quenching could successfully be demonstrated by electrochemical means in an aqueous K-3[Fe(CN)(6)] electrolyte. For this purpose a suitable cell was designed to combine positron annihilation with electrochemical measurements. Highly reversible substantial variations of the mean positron lifetime tau(m) could be observed upon electrochemical switching between the oxidation states Fe(CN)(6)(3-) and Fe(CN)(6)(4-), arising from oxidation of positronium by Fe(CN)(6)(3-). Dynamic in situ measurements in dependence of potential exhibit a hysteresis like behavior of tau(m) which perfectly correlates with the shift between the reduction and oxidation peaks simultaneously monitored by cyclic voltametry.

Automated summary

This study successfully demonstrated the switching of positronium triplet quenching through electrochemical means in an aqueous K-3[Fe(CN)(6)] electrolyte. Dynamic in situ measurements showed highly reversible substantial variations of the mean positron lifetime tau(m) during the electrochemical switching between the oxidation states Fe(CN)(6)(3-) and Fe(CN)(6)(4-).