Infrared absorption spectroscopy
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Infrared absorption spectroscopy can be used to analyze both organic and inorganic compounds. It utilizes three infrared regions - near, mid, and far infrared. The document discusses the instrumentation used in infrared spectroscopy, including infrared radiation sources, monochromators, sample cells, and detectors. It also covers sample preparation techniques for solids, liquids, and gases. Infrared spectroscopy has various applications such as quality control, forensic analysis, polymer analysis, and semiconductor analysis.
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Infrared absorption spectroscopy
- 3. Introduction For analyzing both organic and inorganic compound. Non destructive analysis. Simple method.
- 4. Three infrared portions Near infrared region(0.8–2.5 μm wavelength) , Mid infrared region(2.5–25 μm) , Far infrared region(25–1000 μm).
- 6. Instrumentation IR radiation source Monochromators Sample cells and sampling of substance Detectors
- 7. IR radiation source Incandescent lamp Nernst glower Globar source Mercury arc
- 8. Monochromators prism monochromators, 1. Mono pass and 2. Double pass monochromator grating monochromators.
- 12. Sample cells and sampling of substance Sampling of solids, 1. Solids run in solution 2. Solid films 3. Mull technique 4. Pressed pellet technique Sampling of liquids, Sampling of gases.
- 13. Detectors Bolometers Thermocouple Thermistor Golay cell Photoconductivity cell Semiconductor detectors
- 16. Uses and application • It is used in quality control, dynamic measurement, and monitoring applications such as the long- term unattended measurement of CO2 concentrations in greenhouses and growth chambers by infrared gas analyzers. • It is also used in forensic analysis in both criminal and civil cases, for example in identifying polymer degradation. It can be used in detecting how much alcohol is in the blood of a suspected drunk driver measured as 1/10,000 g/mL = 100 μg/mL. • A useful way of analyzing solid samples without the need for cutting samples • With increasing technology in computer filtering and manipulation of the results, samples in solution can now be measured accurately (water produces a broad absorbance across the range of interest, and thus renders the spectra unreadable without this computer treatment). • Some instruments will also automatically tell you what substance is being measured from a store of thousands of reference spectra held in storage. • Infrared spectroscopy is also useful in measuring the degree of polymerization in polymer manufacture. Infrared spectroscopy has also been successfully utilized in the field of semiconductor microelectronics: for example, infrared spectroscopy can be applied to semiconductors like silicon, gallium arsenide, gallium nitride, zinc selenide, amorphous silicon, silicon nitride, etc. • The instruments are now small, and can be transported, even for use in field trials.