Transcription of Chapter 4 Ultraviolet and visible Absorption Spectroscopy
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Chapter 4 Ultraviolet and visible Absorption Spectroscopy
Chapter 4 Ultraviolet and visible Absorption Spectroscopy Properties of Electromagnetic Radiation Electromagnetic Radiation energy radiated in the form of a WAVE caused by an electric field interacting with a magnetic field result of the acceleration of a charged particle does not require a material medium and can travel through a vacuum Electromagnetic Radiation Electromagnetic Radiation vi = n li where vi => velocity n => frequency li => wavelength Electromagnetic Spectrum Type of Transition Wavelength Range Frequency Range (Hz) Type of Radiation nuclear <1 pm 1020-1024 gamma-rays inner electron 1 nm-1 pm 1017-1020 X-rays outer electron 400 nm-1 nm 1015-1017 Ultraviolet outer electron 750 nm-400 nm visible outer electron molecular vibrations m-750 nm 1x1014-4x1014 near-infrared molecular vibrations 25 m 1013-1014 infrared molecular rotations, electron spin flips* 1 mm-25 m 3x1011-1013 microwaves nuclear spin flips* >1 mm <3x1011 radio waves Electromagnetic Spectrum Interaction of EMR with Matter Jablonski diagram: Selection Rules
chrysene 360 800 pyrene 370 120 perylene 437 3,700 • The 0-0 band appears at lower wavelengths than would be predicted by the number of fused rings (379 for anthracene and ... “Ultraviolet absorption spectra for 1,2,4,5-tetrazine (a.) …
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