Electronic Spectroscopy Hitachi-HiTec. Electronic Excitation Model A ~ X ~  Excitation (Absorption) Radiationless decay (vibrational relaxation)  Fluorescence.

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Presentation transcript:

Electronic Spectroscopy Hitachi-HiTec

Electronic Excitation Model A ~ X ~  Excitation (Absorption) Radiationless decay (vibrational relaxation)  Fluorescence (Fast radiative decay) Internal conversion (Slowish non-radiative decay)

Electronic Excitation Model A ~ X ~ a ~  Excitation Intersystem crossing Radiationless decay (vibrational relaxation) Phosphorescence (Slow radiative decay)  Intersystem crossing (Slow non-radiative decay)

Franck-Condon Principle The intensities of observed peaks in UV-Vis spectra depend on the overlap between the initial and final vibronic states A ~ X ~ A ~ X ~ Good Overlap-Strong Peaks Eh Overlap-Weak Peaks

Fluorescence Spectra Hitachi-HiTec A Plasma Display Panel Fluorescence Spectrum Excite mostly in the UV

Fluorescence Spectra A neat fluorescence spectrum tool for assorted fluoro-cores:

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