Lecture 27. Spectroscopy

Lecture 27. Spectroscopy - Chapter 18: Absorption...

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Unformatted text preview: Chapter 18: Absorption Spectroscopy Chapter ν λ=c c E = hν = h = hc ν λ Daniel C. Harris, Exploring Chemical Analysis, 2nd ed., W.H. Freeman and Company, New York, 2001. Freeman Spectroscopy Spectroscopy The study of the interactions between The electromagnetic radiation and matter. electromagnetic Spectrometry Use of spectroscopy for quantitative Use measurements. measurements. If the electromagnetic radiation has the right amount of energy (wavelength), it can promote a molecule into an excited state: Absorption. molecule A molecule in an excited state can release molecule energy by emission of electromagnetic radiation: Emission. Emission. Electromagnetic Spectrum Electromagnetic Daniel C. Harris, Exploring Chemical Analysis, 2nd ed., W.H. Freeman and Company, New York, 2001. Freeman Rotational Energy Levels Molecule must have a Molecule permanent dipole to absorb the electromagnetic radiation. radiation. => Makes intuitively => sense considering the electromagnetic nature of the radiation. of J. Michael Hollas, Modern Spectroscopy, J. Modern John Wiley & Sons, New York, 1992. John Rotational Spectra (Example: CO Gas) J. Michael Hollas, Modern Spectroscopy, John Wiley & Sons, New York, 1992. J. Modern Electromagnetic Spectrum Electromagnetic Daniel C. Harris, Exploring Chemical Analysis, 2nd ed., W.H. Freeman and Company, New York, 2001. Freeman Infrared Spectroscopy: Vibrational Modes Infrared Vibrational Spectra (Infrared Spectra) Only one vibrational transition for 1H35Cl and one 1H37Cl Only Cl Cl in this frequency range. in => The fine splitting shows the different rotational => levels. levels. J. Michael Hollas, Modern Spectroscopy, John Wiley & Sons, New York, 1992. J. Modern Pretsch/Buhlmann/Affolter/Badertscher, Structure Determination of Organic Compounds Compounds Pretsch/Buhlmann/Affolter/ Pretsch/Buhlmann/Affolter/ Badertscher, Structure Badertscher, Determination of Organic Compounds Compounds Solvents Solvents Pretsch/Buhlmann/Affolter/Badertscher, Pretsch/Buhlmann/Affolter/Badertscher, Structure Determination of Organic Compounds Compounds Suspension Media Suspension Pretsch/Buhlmann/Affolter/Badertscher, Structure Determination of Organic Compounds Pretsch/Buhlmann/Affolter/Badertscher, Structure FTIR Imaging Spectrometer (FTIR Microscope) FTIR JASCO, Hachioji, Japan Infrared Microspectroscopy: Microspectroscopy: Tissue Imaging Colarussa, P. et al. Colarussa, Appl. Spectroscopy. 1998, 52, 106A. Appl. 1998 52 FTIR Microspectroscopy: Tissue Imaging FTIR Colarussa, P. et al. Appl. Spectroscopy. 1998, 52, 106A. Colarussa, Appl. 1998 52 Other Uses for IR Array Detectors Other Colarussa, P. et al. Appl. Spectroscopy. 1998, 52, 106A. Colarussa, Appl. 1998 52 Atomic Emission from a Flame Atomic Ingle and Crouch, Ingle Spectrochemical Analysis Spectrochemical Absorption and Emission Absorption Daniel C. Harris, Exploring Chemical Analysis, 2nd ed., W.H. Freeman and Company, New York, 2001. Freeman Electronic Configuration of Atoms Electronic Electronic Configuration of Atoms Electronic Al: 1s2 2s2 2p6 3s2 3p1 Electronic Configuration of Atoms Electronic Electronic Absorption Spectra Atomic Orbitals (AO) Combine to give Molecular Orbitals (MO) Gary L. Miessler and Donald A. Tarr, Inorganic Chemistry, Gary Prentice Hall, Englewood Cliffs, NJ, 1991. Prentice Electromagnetic Spectrum Electromagnetic Daniel C. Harris, Exploring Chemical Analysis, 2nd ed., W.H. Freeman and Company, New York, 2001. Freeman Chromophores Chromophores Electronic Transitions: Gary D. Christian, Analytical Chemistry, 6th ed., John Wiley & Sons, Inc., U.S.A., 2004. 2004. Types of Energy a Molecule Can Have Types Etotal = Erotational + Evibrational + Eelectronic Gary D. Christian, Analytical Chemistry, 6th ed., John Wiley & Sons, Inc., U.S.A., 2004. 2004. Shape of the electronic spectrum is determined by vibrational and rotational structure. Ingle and Crouch, Spectrochemical Analysis Ingle Spectrochemical Chromophores Chromophores Electronic Transitions: Gary D. Christian, Analytical Chemistry, 6th ed., John Wiley & Sons, Inc., U.S.A., 2004. 2004. ...
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This note was uploaded on 04/06/2011 for the course CHEM 2011 taught by Professor Buhlman during the Spring '10 term at Minnesota.

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