Infrared spectroscopy

Infrared Spectroscopy:
Infrared Spectroscopy is the analysis of infrared light interacting with a molecule. This can be analyzed in three ways by measuring absorption, emission and reflection. The main use of this technique is in organic and inorganic chemistry. It is used by chemists to determine functional groups in molecules. IR Spectroscopy measures the vibrations of atoms, and based on this it is possible to determine the functional groups. Generally, stronger bonds and light atoms will vibrate at a high stretching frequency (wavenumber).
The components of an IR machine are the IR source, beam splitter, monochromator, a transducer, an analog to digital converter and a digital machine to quantify the readout.1 The IR light exits the source and becomes split into to beams, one to be directed to the sample the other to a reference. The intensity of the beam is measured by the intensity emitted divided by the intensity observed, also known as the Transmittance. All frequencies are measured in wavenumber, cm-1. To make a sample with a liquid, the liquid is placed between two pure salt sheets of NaCl and for a solid it is pressure pressed with KBr to incorporate both into one sheet. The reason for using salt to suspend the molecule is because the salt structures form a lattice that is strongly ionically bonded and will not absorb IR light because it lacks the vibrational capability. The Background scan or reference tends to be air.
Below 1500 cm-1 the spectra have very high sensitivity and this region is known as the fingerprint region where C-C bond stretching and bending motions overlap, making it difficult to predict functional groups. For more specific bond stretch frequencies see CharacteristicAbsorption Frequencies in IR Spectra.
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International conference:
1.International society of infrared, Millimeter and Terahertz Waves
2.12th Quantitative InfraRed Thermography Conference QIRT 2014
3.QSIP Quantum Structured Infrared Photodetector International Conference
4.The Council For Near-Infrared Spectroscopy
Societies :
1. IEEE Microwave Theory and Techniques Society
2. International Society of Infrared, Millimeter, and Terahertz Waves
3. Japan Far Infrared Rays Association
4. Hong Kong Far Infrared Rays Association
5. Infrared Data Association
6. The Council For Near-Infrared Spectroscopy
Companies:
FLIR,Raytek, KIMO, JENOPTIX, FLUKE, Micro, Epsilon, Keii, Optris,
Sonal,Troteh, Xenix, Ehol, NIT, BAltech, Headwal, Raptar, ZalaAero

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This page was last updated on April 24, 2024