benzene |
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| The chemical structure of benzene is shown at the right. The absorption and fluorescence emission spectra are shown below. The structure, absorption, and fluorescence data were all obtained from the PhotochemCAD package by Jonathan Lindsey. This excellent program allows rapid comparison of spectra and enables one to do a variety of photochemically relevant calculations. |
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Absorption
This is a graph of the molar extinction coefficient of benzene dissolved in cyclohexane. It was measured by R. A. Fuh on summer, 95 [H. Du, R. A. Fuh, J. Li, A. Corkan, J. S. Lindsey, "PhotochemCAD: A computer-aided design and research tool in photochemistry," Photochemistry and Photobiology, 68, 141-142, 1998]. benzene has a molar extinction coefficient of 210 M-1cm-1 at 254.75 nm [I. B. Berlman, Academic Press, 1965]. The fluorescence yield has also been reported to be 0.07 in cyclohexane [I. B. Berlman, Academic Press, 1965]. Also see [F. H. Quina and F. A. Carroll, "Radiative and nonradiative transitions in solution. First excited singlet state of benzene and its methyl derivatives.," J. Am. Chem. Soc., 98, 6-9, 1976]. |
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Fluorescence
This is the fluorescence emission spectrum of benzene dissolved in cyclohexane. The spectrum was taken by R. A. Fuh on summer, 95 using an excitation wavelength of 240 nm [H. Du, R. A. Fuh, J. Li, A. Corkan, J. S. Lindsey, "PhotochemCAD: A computer-aided design and research tool in photochemistry," Photochemistry and Photobiology, 68, 141-142, 1998]. The quantum yield is 0.053 [W. R. Dawson and M. W. Windsor, "Fluorescence yields of aromatic compounds," J. Phys. Chem., 72, 3251-3260, 1968]. |
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