infrared spectroscopy

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in·fra·red spec·tros·co·py

the study of the specific absorption in the infrared region of the electromagnetic spectrum; used in the study of the chemical bonds within molecules.
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IR spectra were obtained on Frontier spectrometer (Perkin Elmer[R]) Brand Fourier Transform, and DRIFTS accessory for diffuse reflectance.
IR spectra (KBr) ([.sup.v], [cm.sup.-1]): 3336 (NH), 3450 (N[H.sub.2]), 1645 (C=O); [.sup.1]HNMR (DMSO-[d.sub.6]): 8 = 2.75 (brs, 2H, N[H.sub.2]), 4.53 (s, 2H, C[H.sub.2]), 7.30 (d, 2H, J = 5.5 Hz, Ar-H), 8.20 (d, 2H, J = 5.5 Hz, Ar-H), 8.33 (brs, 1H, NH); MS m/z (%) 212 (M+H)+.
They are available in 2x, 3x and 5x magnifications with a choice of enhanced aluminium, bare gold, or protected aluminium coating options for UV, visible and IR spectra.
Figure 1 shows the IR spectra of Y, SBA-15, Y/SBA-15 and Cerium (IV) modified Y/SBA-15 materials.
The IR spectra of the PE-BIO films without exposure to C[O.sub.2] laser radiation show an IR absorption band at 1740 [cm.sup.-1] and stretching vibration of carbonyl group (C=O), whereas the IR spectrum of the LDPE films shows this band after being exposed to C[O.sub.2] laser radiation.
The IR spectra were measured on different spots in the XY position with a Perkin Elmer Spectrum 100 FT-IR spectrometer supplied with a Universal ATR Sampling Accessory.
In IR spectra, the specific vibration of amino group (-N[H.sub.2], double peak) at 3255-3258 [cm.sup.-1] disappeared while the sharpness peak of N-H bonds still appeared around 3200 [cm.sup.-1]; the stretching bands of the C=N bonds were recognized at 1555-1582 [cm.sup.-1].