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Unformatted text preview: 1 Infrared Spectroscopy Chapters 16- Infrared spectroscopy and theory overview Instrumentation IR sources and detectors FT vs dispersive instruments Spectral regions Vibrational frequency calculations Vibrational modes and coupling Applications Calculating fringe patterns and path lengths DRIFTS ATR-FTIR RAIRS / IRRAS Raman overview Theory Raman depolarization ratios Instrumentation Surface enhanced Raman spectroscopy (SERS) Infrared Instrumentation Source, sample, wavelength analyzer or FT, infrared detector Sources Nernst Glower Globar SiC rod operating at 1100 C Incadenscent Wire Mercury Arc Tunsten Filament lamp Carbon Dioxide Laser source Sample container must be transparent in the infrared Halogen salt plates, zinc selenide, germanium, silicon (partly), Differentiating the wavelength that are absorbed by the sample Dispersive Monochromator Nondispersive Fourier Transform Spectrometer Infrared Detectors Pyroelectric transducer Photoconducting transducer Thermal transducer Thermocouple Bolometer or Thermistor 2 Infrared Spectroscopy Infrared spectrometry includes near - mid - and far - infrared wavelength regions Spectral Range 12,800 cm-1 to 10 cm-1 (0.78 m to 1000 m) Near infrared spectrometry - 12,800 - 4000 cm-1 (0.78 to 2.5 microns)- Quantitative analysis of industrial and agricultural materials - and for process control Mid infrared spectrometry...
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