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Self-Absorption Effect on the Spectral Properties of 2-Methylnaphthalene in Different Solvent | ||
| Al-Mustansiriyah Journal of Science | ||
| Article 1, Volume 22, Issue 5, 2011, Pages 295-308 | ||
| Author | ||
| Abdulla Ahmed Rasheed | ||
| Abstract | ||
| The fluorescence spectra for 2-Methylnaphthalene solution which dissolved in hexane, ethanol and paraffin as a function of concentration at excitation wavelength (λex= 270nm) was measured andinvestigated the quantum efficiency (qFM),theradiative fluorescence lifetime(τFM), rate parameter of radiative (KFM) and non-radiative (KIM) processes were calculated.Where the quantum efficiency is equal to (qFM=0.20) and(qFM=0.15) for 2-methylnaphthalene solution dissolved in hexane and ethanol at concentration [10-4M], respectively. But the quantum efficiency of 2-methylnaphthalene in paraffin is equal to (qFM=0.24) at same concentration. This different in the values of quantum efficiency refers to different in polar solvent and viscosity of solutions. It's found that the increase in molar concentration led to decrease the intensity of spectrum, quantum efficiency and rate parameter of radiative process (KFM)because of the effect of self-absorption phenomena. In additional, the quantum efficiency measurement was calculated relative to standard compound of naphthalene with quantum efficiency (qFM=0.14) at same excitation wavelength. All measurement were carried at room-temperature. | ||
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