Collisional Ionization of Excited State Neon in a Gas Discharge Plasma

Abstract

We report the first case where it is possible to clearly identify and quantitatively characterize the dominant physical processes contributing to production of the optogalvanic effect (OGE) signal in a discharge plasma. This work concentrates on the simplest case where only two states are involved in the optical transition. The theoretical model with only four parameters is in excellent agreement with the experimentally obtained time-resolved OGE waveforms. The collisional ionization rate in the upper state is twice as fast as that in the lower state although the two states are only separated by 1.94 eV. We conclude that the optogalvanic effect of the neon 640.22 nm transition is due primarily to the electron collisional ionization of the neon atoms. An alternative interpretation for the lengthening of the final state lifetime is also included (see Appendix)

On the Time‐Resolved Optogalvanic Spectra of Neon and Krypton

“…This work suggested the dominant effects of electron collisional transfer in determining the sign and magnitude of the optogalvanic effect. Meanwhile, a simple theoretical model to understand the physics of the experimentally observed time-resolved OGE waveforms has been developed by Han et al [11]. This model has been proved successful in extracting quantitative information on the dominant physical processes in neon and argon discharges [12,13].…”