What is the Difference Between Atomic Absorption and Atomic Emission?Ītomic absorption is the absorption of electromagnetic radiation by atoms while atomic emission is the emission of electromagnetic radiation from atoms. Log absorption value or the transmission value is also used for the y-axis in some occasions. Sometimes instead of wavelength, frequency or wave number can also be used in the x-axis. An absorption spectrum is a plot drawn between absorbance and wavelength. Since this energy difference is discrete and constant, the same kind of atoms will always absorb the same wavelengths from the given radiation. The energy difference between the two levels is supplied by the photons in the electromagnetic radiation. The absorbed energy helps to excite ground electrons to upper levels in the atom. When a beam of electromagnetic radiation passes through a sample containing gaseous atoms, the atoms absorb only some wavelengths. Likewise, atoms or molecules also absorb certain wavelengths from the electromagnetic radiation (these wavelengths are not necessarily in the visible range). Thus, purple is the complementary colour of green. For example, we see an object as green because it absorbs purple light from the visible range. In fact, it absorbs the complementary colour of the colour we see. Side by Side Comparison – Atomic Absorption vs Atomic Emission in Tabular FormĪ coloured compound is visible to our eyes in that particular colour because it absorbs light from the visible range. Therefore, atomic absorption and atomic emission are complementary to each other. When absorption and emission spectra of a species are put together, they form a continuous spectrum. The key difference between atomic absorption and atomic emission is that atomic absorption describes how atoms absorb certain wavelengths from the electromagnetic radiation whereas atomic emission describes how atoms emit certain wavelengths.Ībsorption and emission of an atom help to identify atoms and provide many details about them.
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