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IR-Spectroscopy & Physical Tables IR-Window Material Infrared Tables Near Infrared Table Sources Detectors Beamsplitters Conversion Table of Energy and Wavelength Units for Far and Mid Infrared Conversion Table of Energy and Wavelength Units for Near Infrared, Visible and UV Conversion Table of Transmittance and Absorbance Units SI Unit System ...
The following table lists infrared spectroscopy absorptions by frequency regions.
By interpreting the frequencies of infrared light absorbed by a molecule, one can identify bond-stretching motions and therefore gain structural information such as what type of functional groups and chemical bonds are present.
Table of Characteristic IR Absorptions. You can download this chart as a printable acrobat pdf file.
Table 1. Characteristic IR Absorption Peaks of Functional Groups* * Abbreviations: s = strong; m = medium; w = weak; br = broad; sat. = saturated; conj. = conjugated ** Alcohols, Esters, Carboxylic Acids, and Anhydrides also absorb in the fingerprint region due to the C-O stretch (1300 – 1000, s). Table 2.
Units used in IR spectroscopy The wavelength of light in the IR region varies from about 2.5 to 40 μ where 1 μ= 10-4 cm. Since λ cmν sec-1 = c and E = h ν, then ν= c/ λ; νis proportional to 1/ λ, the general convention in IR is to list frequencies proportional to energy. Frequencies in IR are generally expressed in 1/ λunits; ie cm-1 ...
IR spectra are acquired on a special instrument, called an IR spectrometer. IR is used to gather information about compound's structure, assess its purity, and sometimes to identify it. Infrared radiation is that part of the electromagnetic spectrum between the visible and microwave regions.
