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A spectrum is a plot of electromagnetic energy as a function of frequency or wavelength. The recording and studying of spectrum of energy levels in atoms or molecules in the physical sciences is called spectroscopy. A device for recording a spectrum is a spectrometer or spectrophotometer. The latter term is used when an optical spectrum is recorded by the device.

Types of spectroscopy

Other Topics

  • Fourier Transform Spectroscopy - An efficient method for collecting various spectra. Frequently applied to infra-red spectroscopy (FTIR) and Nuclear Magnetic Resonance Spectroscopy.
See also: spectroscopic analysis