587 08 wk06a IR_only_ch 16- v2a

587 08 wk06a IR_only_ch 16- v2a - 1 Infrared Spectroscopy...

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Unformatted text preview: 1 Infrared Spectroscopy Chapters 16- Infrared spectroscopy and theory overview ¾ Instrumentation IR sources and detectors FT vs dispersive instruments ¾ Spectral regions ¾ Vibrational frequency calculations ¾ Vibrational modes and coupling ¾ Applications ¾ Calculating fringe patterns and path lengths ¾ DRIFTS ¾ ATR-FTIR ¾ RAIRS / IRRAS Raman overview ¾ Theory ¾ Raman depolarization ratios ¾ Instrumentation ¾ 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 µ m to 1000 µ 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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587 08 wk06a IR_only_ch 16- v2a - 1 Infrared Spectroscopy...

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