Atom absorption spectroscopy method generates at least one first beam of monochromatic radiation at a certain wavelength. Radiation is separated into a test beam and a reference beam, and only the test beam is led through a test area. Subsequently, both beams pass through a slot system into a monochromator, and after their spectral breakdown, reach a detector system. In order to improve such atom absorption spectroscopy method in a way that allows the test beam and the reference beam as well as their spectra to be guided close to, or adjacent to one other onto the detector system, and, at the same time enables a simple and easy adaptation of the spectrometer's effective spectral range to a monochromator's characteristics, the test beam and the reference beam thus pass through different slots in the slot system and are projected onto essentially spatially separate areas of the detector system, with their spectra's broken-down.
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