Application of the laser induced fluorescence of metal atoms and ions to the study of glow discharges
The laser induced fluorescence (LIF) of atoms, molecules and ions makes it possible to measure selectively the density of these particles in specific electronic states and in well defined velocity intervals. LIF is used to elucidate the transport and ionisation of sputtered metal atoms in cold cathode glow discharges in argon and helium. The investigations are extended to include the ionised state of the sputtered particles. By measuring the velocity distribution of the ions space resolved, their behaviour in the strong electric field of the cathode fall can be studied. A few selected experimental results on the axial distribution of the density of metal atoms and ions (in the ground state and in metastable states) in front of the cathode of glow discharges are presented, and conclusions on their transport and ionisation are reached. First measurements of ion velocity distributions are also reported, from which other interesting quanitities are derived.
Bibliographic Reference: Article: Proceedings of the Fourth International Symposium on Laser-Aided Plasma Diagnostics (1989) pp. 147-153
Record Number: 199010837 / Last updated on: 1994-12-01
Original language: en
Available languages: en