WHEN TWO PULSED DYE LASERS ARE TUNED IN SPATIAL AND TEMPORAL COINCIDENCE TO TWO CONNECTED ATOMIC TRANSITIONS IN A FLAME OR PLASMA, THE RESONANCE FLUORESCENCE MONITORED FROM THE FIRST EXCITED LEVEL DECREASES DUE TO THE DEPLETION OF THE POPULATION OF THAT LEVEL INDUCED BY THE SECOND LASER EXCITA- TION STEP. THE MONITORING OF SUCH A DECREASE (FLUORESCENCE DIP) CAN BE SHOWN FROM SIMPLE THEORETICAL CONSIDERATIONS TO BE USEFUL FOR THE EVALUATION OF SOME FUNDAMENTAL PARAMETERS OF THE ATO- MIC TRANSITION INVOLVED IN THE SECOND-EXCITATION STEP. BOTH STEADY STATE AND TRANSIENT BEHAVIOUR ARE DISCUSSED. THE IN- FORMATION CONTENT OF THE FLUORESCENCE DIP IS SIMILAR TO THAT OF THE SATURATED FLUORESCENCE SIGNAL. HOWEVER, SEVERAL DI- STINCT ADVANTAGES ARE OFFERED BY THE NEW TECHNIQUE ESPECIAL- LY WHEN THE LEVEL REACHED BY THE SCOND SCOND EXCITATION STEP IS CLOSE TO THE IONIZATION LIMIT OF THE ATOM
TURK Gregory;
WINEFORDNER James;
1995-03-15
JRC5064
https://publications.jrc.ec.europa.eu/repository/handle/JRC5064,
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