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Abstract

THE PRESENT WORK DEALS WITH THE MEASUREMENT OF ABSOLUTE DENSITIES AND VELOCITY DISTRIBUTIONS OF ATOMIC HYDROGEN, DEUTERIUM AND CARBON IN THE GROUND STATE BY MEANS OF LASER INDUCED FLUORESCENCE IN THE VACUUM ULTRAVIOLET. THIS HAS ON THE ONE SIDE PROMOTED THE DEVELOPMENT OF A RELIABLE LASER SOURCE APT TO EXCITE THE L(ALPHA)-LINE OF HYDROGEN AND TWO MA RESONANCE LINES OF CARBON. ON THE OTHER SIDE, THIS SOURCE HAS PROVED SUCCESSFUL IN THE DETECTION OF THE AFORESAID NEUTRAL SPECIES IN GAS DISCHARGES AND IN VARIOUS SPUTTERING EXPERIMENTS. THE PRIMARY RESULT IS EFFICIENT FREQUENCY TRIPLING OF AN EXCITED-PUMPED PULSED DYE LASER IN NO GAS MIXTURES WHOSE RATHER EASY HANDLING CONTRIBUTES TO THE OVERALL FLEXIBILITY OF THE LASER SYSTEM. THE USEFULNESS OF THIS LIGHT SOURCE WAS THEN DEMONSTRATED IN SEVERAL SPUTTERING EXPERIMENTS - THROUGH THE DETECTION OF HYDROGEN AND CARBON BY LASER INDUCED FLUORESCENCE IN THE VACUUM UV. THE APPLICATION OF THE METHOD TO MATERIAL EVALUATION IN LABORATORY EXPERIMENTS OR AS IN SITU PLASMA DIAGNOSTIC IS PROMISING. IT COULD POSSIBLY BE APPLIED TO FUSION MACHINES IF THE BACKGROUND LIGHT CAN BE REDUCED TO A REASONABLE LEVEL.

Additional information

Authors: MERTENS P H KFA, JUELICH, D, KFA, JUELICH, D
Bibliographic Reference: REPORT JUL-2154, 1987, AVAILABILITY: KFA, JUELICH, D
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