Title: Atomic and Ionic Fluorescence Dip Spectroscopy as a Tool for Flame and Plasma Diagnostics
Authors: TURK GregoryWINEFORDNER James
Citation: Spectrochimica Acta B vol. 42 p. 807-817
Publication Year: 1987
JRC N°: JRC5064
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC5064
Type: Articles in periodicals and books
Abstract: 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
JRC Directorate:Joint Research Centre Historical Collection

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