IGNOU BCHET 147 2026 - With the help of suitable diagrams explain how the IR spectrum is depi

Question

With the help of suitable diagrams explain how the IR spectrum is depicted in the absorption mode and the transmittance mode.

10 Jan 2026

Answer :

Word Count : 243

In IR spectroscopy, the spectrum can be represented in two commonly used modes: absorption mode and transmittance mode. In absorption mode, the y-axis represents absorbance (A), which is directly related to the fraction of IR radiation absorbed by the sample. Peaks in this spectrum correspond to specific vibrational frequencies of bonds in molecules, such as C–H, O–H, or metal–ligand stretches in organometallic complexes. For instance, in a polynuclear hydrocarbon or an organometallic carbonyl complex, the C=O or M–CO stretching vibrations

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