RECENT EXPERIMENTAL AND THEORETICAL STUDIES OF LASER ENHANCED IONIZATION SPECTROSCOPY IN FLAMES AND PLASMAS
Several recent experiments are described where single step and two step laser excitation in atmospheric pressure flames and plasmas is used to significantly enhance the atomic population of excited levels from which collisional ionization occurs. It is shown that, for short nanosecond laser pulses, single step excitation to levels which are several eV below the ionization potential does not result in a significant ionization yield while with two-step excitation to a Rydberg level the ionization can reach almost 100%. Several non-linear interaction processes are described for strontium atoms in an air - acetylene flame, involving two- photon as well as near resonance absorptions. Finally, a combination of the fluorescence and the ionization techniques, where one laser is used to ionize the atoms and another laser probes the resulting ionic fluorescence, is shown to be a very attractive tool for flame and plasma diagnostics.
Bibliographic Reference: "LASERS 86", ORLANDO, FLORIDA (USA), NOV. 3-7, 1986 WRITE TO CEC LUXEMBOURG, DG XIII/A2, POB 1907 MENTIONING PAPER E 33144 ORA
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Record Number: 1989125025200 / Last updated on: 1987-03-01
Available languages: en