Fluorescence ratio of the two D sodium lines in flames for D1 and D2 excitation |
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Authors: | N Omenetto MS Epstein JD Bradshaw S Bayer JJ Horvath JD Winefordner |
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Institution: | Department of Chemistry, University of Florida, Gainesville, FL 32611, U.S.A. |
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Abstract: | The ratio of the fluorescence intensities from the two lines of the yellow sodium doublet has been investigated in several hydrogen-based and acetylene-based flames and with various types of lasers as excitation sources. The systematic deviation from 2 for the ratio D2/D1 when either D1 or D2 are used as exciting transitions can be simply explained by the relative difference in the values of the collisional mixing constants between the excited P-levels and the collisional quenching constants transferring atoms from both P-levels to the ground S-level. Results obtained in flames characterized by different values of the quantum efficiency follow the behavior predicted by the fluorescence expressions obtained by a simple, steady-state theoretical approach. |
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Keywords: | To whom all correspondence should be addressed |
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