Atomic absorption refers to the absorption phenomenon of a gaseous atom in a characteristic line radiated by a homogeneous atom.
When the radiation is projected onto the atomic vapor, if the energy corresponding to the wavelength of the radiation is equal to the energy required for the atom to transition from the ground state to the excited state, it will cause the atom to absorb the radiation and produce an absorption spectrum. The ground state atom absorbs energy, and the outermost electrons make a transition, transitioning from a low energy state to an excited state.
Atomic absorption spectroscopy determines the amount of compound in the sample according to Lange-Beer's law. The absorption spectrum and molar absorbance of the desired sample elements are known, and each element will preferentially absorb light of a particular wavelength because each element needs to consume a certain amount of energy to change it from a ground state to an excited state. During the detection process, the ground state atom absorbs the characteristic radiation, and the content of the element to be tested is measured by measuring the degree of absorption of the characteristic radiation by the ground state atom.
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