Abstract
Fluorescence of the S 1→S 0 transition of naphthalene vapour after laser excitation at 266 nm was studied in a heated cell. Experiments were carried out for temperature in the range 350–900 K, at pressure between 0.1 and 3.0 MPa and for oxygen molar fraction from 0 to 21%. The absorption cross section of naphthalene showed a non-monotonic dependence upon temperature, which may be attributed to the spectral structures present in the absorption spectrum of naphthalene. Under nitrogen atmosphere, naphthalene fluorescence bi-exponentially decreased by an order of magnitude as temperature increased, whereas it increased by about 10% with pressure. Strong influence of quenching by O2 on naphthalene fluorescence was observed and Stern–Volmer plots were found to be linear for temperatures between 450 and 750 K. The dependence of naphthalene fluorescence on oxygen concentration suggests one to use this molecule for fuel-concentration measurements in turbulent flows.
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Orain, M., Baranger, P., Rossow, B. et al. Fluorescence spectroscopy of naphthalene at high temperatures and pressures: implications for fuel-concentration measurements. Appl. Phys. B 102, 163–172 (2011). https://doi.org/10.1007/s00340-010-4353-7
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DOI: https://doi.org/10.1007/s00340-010-4353-7