Transcription of Ultraviolet - Visible Spectroscopy (UV)
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Ultraviolet - Visible Spectroscopy (UV)
UV Ultraviolet - Visible Spectroscopy (UV) UVIntroduction to Ultraviolet - Visible Spectroscopy1 (UV) Background TheoryAbsorption of Ultraviolet and Visible radiationAbsorption of Visible and Ultraviolet (UV) radiation is associated with excitation of electrons, in both atoms and molecules, from lower to higher energy levels. Since the energy levels of matter are quantized, only light with the precise amount of energy can cause transitions from one level to another will be absorbed. The possible electronic transitions that light might cause are2: In each possible case, an electron is excited from a full (low energy, ground state) orbital into an empty (higher energy, excited state) anti-bonding Each wavelength of light has a particular energy associated with it.
Molecules that contain conjugated systems, i.e. alternating single and double bonds, will have their electrons delocalised due to overlap of the p orbitals in the double bonds. This is …
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