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homework solutions10 - Homework Solutions for Chem 422...

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Homework Solutions for Chem 422 Chapter 15 1. In a fluorescence emission spectrum, the excitation wavelength is held constant and the emission intensity is measured as a function of the emission wavelength. In an excitation spectrum, the emission is measured at one wavelength while the excitation wavelengths are scanned. The excitation spectrum closely resembles an absorption spectrum since the emission intensity is usually proportional to the absorbance of the molecule. 2. a) Fluorescence is the electronic de-excitation by emission of photons involving a transition from a higher energy singlet state to a lower energy singlet state. b) Phosphorescence is the electronic de-excitation by emission of photons involving a transition from a higher energy triplet state to a lower energy singlet state.
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