SCIENCE|natural and applied sciences|physical sciences|chemistry
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- Atomabsorption | AA
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- Definition Absorption optischer Strahlung durch freie Atome im Gaszustand Reference DIN 51401-1:2001: Atomabsorptionsspektrometrie (AAS) – Teil 1: Begriffe, S. 2
- atomic absorption
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- Definition the phenomenon during which the electrons of the atoms can be promoted to higher orbitals for a short amount of time by absorbing a set quantity of energy (i.e. light of a given wavelength). This amount of energy (or wavelength) is specific to a particular electron transition in a particular element, and in general, each wavelength corresponds to only one element. Reference Wikipedia http://en.wikipedia.org/wiki/Atomic_absorption_spectroscopy [21.10.2009]
- Comment As the quantity of energy (the power) put into the flame is known, and the quantity remaining at the other side (at the detector) can be measured, it is possible, from Beer-Lambert law, to calculate how many of these transitions took place, and thus get a signal that is proportional to the concentration of the element being measured.