Hydrogen peroxide generated by an atmospheric He-O2-H2O flowing   post-discharge: production mechanisms and absolute quantification
  An atmospheric plasma torch has been supplied with a gaseous mixture of helium, water vapour and/or oxygen to study the production of reactive species within its flowing post-discharge, in particular hydrogen peroxide. The mechanisms responsible for the production of H2O2 have been investigated by correlating measurements of mass spectrometry and absorption photospectrometry. An absolute quantification of H2O2 has also been achieved and indicated that for 5 mmol of water vapour injected in the He-H2O discharge, approximately 9.5 mol of H2O2 were produced in post-discharge. 
Thierry Dufour, N. El-Mourad, Caroline De Vos, F Reniers
physics.plasm-ph physics.chem-ph