Spectroscopy includes a range of techniques to study the composition, structure, and bonding of elements and compounds. The different methods of spectroscopy use different wavelengths of the electromagnetic spectrum to study atoms, molecules, ions, and the bonding between them. The types of spectroscopy are: Nuclear magnetic resonance spectroscopy (uses radio waves); infrared spectroscopy (uses infrared radiation); atomic absorption spectroscopy, atomic emission spectroscopy, and ultraviolet spectroscopy (use visible and UV radiation); and X-ray spectroscopy (uses X-rays).