Why is it important to do a background scan before running the sample in IR?

Conducting a background scan before running a sample in infrared (IR) spectroscopy is crucial to establish a baseline for the measurement. This baseline helps identify any noise or interference from the solvent, sample holder, or the instrument itself, ensuring that the resulting spectra are accurate and reliable. By subtracting the background from the sample spectrum, researchers can isolate the specific absorption features of the sample, leading to more precise analysis and interpretation of the data.