Why is near infrared spectroscopy used?

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Sep 28, 2017

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Because many organic compounds absorb in the infrared.

Explanation:

The length and tightness of a bond determines the frequency at which a certain bond will resonate/vibrate. (Compare this to strings in sound).

Each frequency corresponds to a wavelength (colour) in the electromagnetic spectrum. Many bonds in organic compounds resonate with wavelengths just beyond those of the visible spectrum, i.e. infrared.

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