A New Technique for Ultrafast Velocity Distribution Measurements of Atomic Species by Post-Ionization Laser Induced Fluorescence (PILIF)

F L Tabares

doi:10.1155/lc.12.137

Abstract

A new method for single shot velocity distribution measurement of metallic impurities of relevance for studies involving continuous sources, such as limiter experiments in fusion devises or sputtering experiments, based in the combination of Resonant Enhanced Multiphoton Ionization (REMPI) and Laser Induced Fluorescence (LIF) is proposed. High ionization yield and good time resolution are expected according to the numerical simulation of the experiment that has been run for several atomic species. Other possible applications of REMPI to plasma edge physics and to conventional techniques for velocity distribution measurements are briefly addressed.

Highlights

Velocity distributions, of great relevance in many fields of physics and chemical physics, can be readily measured by Time of Flight (TOF) techniques, provided that free collision conditions exist in the region between the source and the detector
3 In general these measurements require many, reproductible, plasma discharges and new methods based on fast scanning of the dye laser frequency during a single discharge have been developed as alternative.[4]
The most appealing way to carry out the experiment would be by using the same experiment set-up as for Laser Induced Fluorescence (LIF) detection

Summary

A NEW TECHNIQUE FOR ULTRAFAST VELOCITY DISTRIBUTION MEASUREMENTS OF ATOMIC

Association EURA TOM/CIEMA T, 20040 Madrid, Spain (Received 20 September 1991; in finalform 15 October 1991). A new method for single shot velocity distribution measurement of metallic impurities of relevance for studies involving continuous sources, such as limiter experiments in fusion devises or sputtering experiments, based in the combination of Resonant Enhanced Multiphoton Ionization (REMPI) and Laser Induced Fluorescence (LIF) is proposed. High ionization yield and good time resolution are expected according to the numerical simulation of the experiment that has been run for several atomic species. Other possible applications of REMPI to plasma edge physics and to conventional techniques for velocity distribution measurements are briefly addressed

INTRODUCTION

PILIF Experiment

Model Calculation for Extended Sources

EXPERIMENTAL SET-UP

OTHER EXPERIMENTS