Discovered Infrared Radiation by spliiting light with a

• Discovered Infrared Radiation by spliiting light with a prism and measuring the temperature change for different wavelengths (1800) • Wavelength is 700 nm – 300 mm • Near Infrared: 0. 7 – 2. 5 mm • Mid Infrared: 2. 5 mm – 25 mm tps: //en. wikipedia. org/wiki/William_Hersche • Far Infrared: 25 mm – 300 mm • First IR Spectrometer 1835 l • First IR Spectrometer with resolutio of 2 cm-1 in 1969 Theophile Theophanides, Introduction to Infrared Spectroscopy, in Radiation Chemisty and Biospectroscopy

Not listed: contact angle measurements, profilometry, zeta potential measurements, BET surface anlysis, cyclic voltammetry, over 100 other techniques for surface analysis

Source: Evans Analytical Group

Overview of FTIR • IR spectra result from quantized vibrational energy states For a harmonic potential Vibrational Energy Fundamental frequency Fourier Transform Infrared Spectroscopy, 2 nd Ed. PR Griffiths and JA de Haseth. Wiley: 2007

Overview of FTIR • IR spectra result from quantized vibrational energy states https: //chem. libretexts. org/Libre. Texts/University_of_California_Davis/UCD_Chem_002 CH/UNIT _IV%3 A_MOLECULAR_SPECTROSCOPY/20. 2%3 A_Vibrations_and_Rotations_of_Molecules%3 A_I nfrared_and_Microwave_Spectroscopy

Overview of FTIR • IR spectra result from quantized vibrational energy states • Some materials are IR-inactive. These are nonpolar or symmetric molecules https: //chem. libretexts. org/Libre. Texts/University_of_California_Davis/UCD_Chem_002 CH/UNIT _IV%3 A_MOLECULAR_SPECTROSCOPY/20. 2%3 A_Vibrations_and_Rotations_of_Molecules%3 A_I nfrared_and_Microwave_Spectroscopy

Overview of FTIR • IR spectra result from quantized vibrational energy states Fourier Transform Infrared Spectroscopy, 2 nd Ed. PR Griffiths and JA de Haseth. Wiley: 2007

Overview of FTIR • IR spectra result from quantized vibrational energy states https: //chem. libretexts. org/Libre. Texts/University_of_California_Davis/UCD_Chem_002 CH/UNIT _IV%3 A_MOLECULAR_SPECTROSCOPY/20. 2%3 A_Vibrations_and_Rotations_of_Molecules%3 A_I nfrared_and_Microwave_Spectroscopy

Overview of FTIR • IR spectra result from quantized vibrational energy states Need to measure the distribution of frequencies or wavelengths https: //chem. libretexts. org/Libre. Texts/University_of_California_Davis/UCD_Chem_002 CH/UNIT _IV%3 A_MOLECULAR_SPECTROSCOPY/20. 2%3 A_Vibrations_and_Rotations_of_Molecules%3 A_I nfrared_and_Microwave_Spectroscopy

Analysis of transmitted beam • FTIR measurement will measure the absorbance (transmittance) of a beam as a function of wavelength (wavenumber) • This is done by Interferometry Fourier Transform Infrared Spectroscopy, 2 nd Ed. PR Griffiths and JA de Haseth. Wiley: 2007

Analysis of transmitted beam Fourier Transform Infrared Spectroscopy, 2 nd Ed. PR Griffiths and JA de Haseth. Wiley: 2007

Interferometry resolution Fourier Transform Infrared Spectroscopy, 2 nd Ed. PR Griffiths and JA de Haseth. Wiley: 2007

Overview of FTIR • Example IR Spectra https: //chem. libretexts. org/Libre. Texts/University_of_California_Davis/UCD_Chem_002 CH/UNIT _IV%3 A_MOLECULAR_SPECTROSCOPY/20. 2%3 A_Vibrations_and_Rotations_of_Molecules%3 A_I nfrared_and_Microwave_Spectroscopy

Stretching and Bending bends in FTIR Theophile Theophanides, Introduction to Infrared Spectroscopy, in Radiation Chemisty and Biospectroscopy

Spectral Database for Organic Compounds • Contains NMR and FTIR data for various organic compounds: • https: //sdbs. db. aist. go. jp/sdbs/cgibin/cre_index. cgi

Example problems for IR spectra identification • https: //www 2. chemistry. msu. edu/faculty/reu sch/virttxtjml/spectrpy/infrared. htm • Scroll down and match the funcitonal groups to the spectra