Electrochemical switching of positronium triplet quenching

Philipp Emanuel Brunner*, Eva-Maria Steyskal, Roland Würschum

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Switching of positronium triplet quenching could successfully be demonstrated by electrochemical means in an aqueous K3[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 τm could be observed upon electrochemical switching between the oxidation states Fe(CN)63- and Fe(CN)64-, arising from oxidation of positronium by Fe(CN)63-. Dynamic in situ measurements in dependence of potential exhibit a hysteresis like behavior of τm which perfectly correlates with the shift between the reduction and oxidation peaks simultaneously monitored by cyclic voltametry.

Original languageEnglish
Pages (from-to)25278-25283
Number of pages6
JournalPhysical Chemistry, Chemical Physics
Issue number44
Publication statusPublished - 28 Nov 2021

ASJC Scopus subject areas

  • General Physics and Astronomy
  • Electrochemistry

Fields of Expertise

  • Advanced Materials Science


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