Homework Solutions for Chem 422Chapter 151. In a fluorescence emission spectrum, the excitation wavelength is held constant and theemission intensity is measured as a function of the emission wavelength. In an excitationspectrum, the emission is measured at one wavelength while the excitation wavelengthsare scanned. The excitation spectrum closely resembles an absorption spectrum since theemission intensity is usually proportional to the absorbance of the molecule. 2.a)Fluorescenceis the electronic de-excitation by emission of photons involving atransition from a higher energy singlet state to a lower energy singlet state.b)Phosphorescenceis the electronic de-excitation by emission of photons involving atransition from a higher energy triplet state to a lower energy singlet state.
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