Swarm parameter measurement in hydrogen, considering secondary photonic electron emission

Abstract

Discharges in hydrogen at pressures above $1$kPa and a reduced electric field of $E/N=100-200$Td show a characteristic current oscillation in Pulsed Townsend experiments. This is explained by secondary emission of electrons from the photo-cathode: some hundreds of nano-seconds after the laser-pulse that released the initial $10^4-10^6$ primary electrons, secondary electrons are emitted from the cathode. Mechanisms discussed in literature are UV-emission from neutral molecules, emission by positive ions reaching the cathode, and back-scattering of excited neutrals. For a measurement up to $500$Td and pressures up to $2$kPa we model different sources, and agree with previous findings that the observed secondary emission is purely due to ultra-violet light below $200$Td: the simulation fits with the complicated form of the oscillating waveform. Obtained swarm parameters agree well with the literature. Our findings suggest a very high efficiency of the photo-cathode for UV light of energies above $8$eV.