Rayleigh scattering by sodium vapour in flames |
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Authors: | M. J. Jongerius J. J. van der Bij Tj. Hollander C. Th. J. Alkemade |
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Affiliation: | Fysisch Laboratorium, Rijksuniversiteit, Utrecht, The Netherlands |
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Abstract: | In this paper we report on Rayleigh scattering measurements of sodium on the Na D-doublet in several premixed, laminar, shielded H2/O2/N2, H2/O2/Ar and C2H2/O2/N2 flames at one atm. We performed the measurements under non-saturation conditions. The tunable CW dye-laser used produced linearly polarized light. The laser frequency was tuned well outside the absorption-line width of the sodium D-doublet lines. We have compared the ratio of Rayleigh scattering to collison-induced resonance-fluorescence (measured at fixed detunings of the laser) with theoretical predictions. In some flames, we also measured Rayleigh scattering and its polarization, as a function of detuning of the laser in the 4–40 Å region, for the red Na-D1 and the blue Na-D2 wings and found good agreement with theoretical predictions. Polarization of collision-induced fluorescence did not exceed 4% in this wavelength range. |
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