IR spectroscopy. A technique for determining the structure (and sometimes concentration) of molecules by observing how infrared radiation is absorbed by a sample.
a spectroscopic method useful in investigating the bonding in molecules.
Infrared absorption curves are used to identify the chemical functionality of waxes. Petroleum waxes with only hydrocarbon functionality show slight differences based on crystallinity, while vegetable and insect waxes contain hydrocarbons, carboxylic acids, alcohols and esters. The IR curves are typically used in combination with other analytical methods such as DSC or GS/GPC to characterize waxes.
the study of the interaction of infrared radiation with matter.
The infrared absorption spectrum of a substance is sometimes called its molecular fingerprint. Although frequently used to identify materials, infrared spectroscopy also may be used to quantify the number of absorbing molecules. chemistry.allinfoabout.com
An analytical method using infrared absorption for assessing the properties of used oil and certain contaminants suspended therein. See FTIR. This method includes measuring the percentage of peaks in the used oil infrared spectrum which match those in the reference oil. A sudden decrease in this value usually means that the oil was mixed with a different type.
the study of the absorption of infrared light by substances. [Since this corresponds to vibrational (and some rotational) changes, infrared spectroscopy provides valuable information about the structure of a substance. Detailed correlation tables exist relating infrared bands (absorbances) to functional groups.
(IR Spectroscopy)- A type of spectroscopy that uses the infrared portion of the electromagnetic spectrum. The infrared part of the electromagnetic spectrum; electromagnetic wave frequencies below the visible range.
The study of the interaction of substances with infrared electromagnetic radiation in the 3–33-μm spectral region. In this spectral region the infrared (IR) radiation interacts with vibrational–rotational energy levels of the substance under study. IR spectroscopy can be used to determine the concentration of the sample under study or to study the spectral characteristics of the sample. In the former case, the absorption of IR radiation is related to the sample concentration through the Beer–Lambert law. In studying spectral features, one obtains information about functional groups, interatomic distances, bond-force constants, and molecular charge distributions. See tunable laser spectroscopy.
Infrared spectroscopy (IR Spectroscopy) is the subset of spectroscopy that deals with the infrared region of the electromagnetic spectrum. It covers a range of techniques, with the most common type by far being a form of absorption spectroscopy. As with all spectroscopic techniques, it can be used to identify a compound and to investigate the composition of a sample.
