INFRARED SPECTROSCOPY

We use the term infrared spectroscopy in a general sense to include diffuse reflection spectroscopy or transmission spectroscopy in the following wavelength ranges:

 

Visible: 350 to 700 nm (28,571 to 14,286 cm-1)
Near-infrared: 700 to 2,500 nm (14,286 to 4,000 cm-1).
Mid-infrared: 2,500 nm to 25,000 nm (4,000 to 400 cm-1)

 

We also include attenuated total reflectance (ATR), which is a reflection technique that is increasingly being used as a substitute for mid-infrared transmission spectroscopy.