Noun
One who, or that which, atomizes; esp., an instrument for reducing a liquid to spray for disinfecting, cooling, or perfuming.
Source: Webster's dictionaryIn short, the electrons of the atoms in the atomizer can be promoted to higher orbitals (excited state) for a short period of time (nanoseconds) by absorbing a defined quantity of energy (radiation of a given wavelength ). Source: Internet
The radiation flux without a sample and with a sample in the atomizer is measured using a detector, and the ratio between the two values (the absorbance) is converted to analyte concentration or mass using the Beer-Lambert Law. Source: Internet