What is the typical wavelength range used in atomic absorption spectroscopy?

In atomic absorption spectroscopy (AAS), the typical wavelength range utilized falls within 200 to 400 nm. This range is significant due to the electronic transitions that occur when atoms absorb light. In this spectral region, many elements exhibit specific absorption lines, whereby they absorb light at characteristic wavelengths corresponding to the energy differences between their electronic states.

In terms of practicality for AAS, this wavelength region includes a variety of elements, allowing for efficient analysis and detection of metals and other substances in various samples. The sensitivity of measurements, combined with the ability to measure different elements, generally makes the 200-400 nm range the most effective for atomic absorption techniques.

While the other ranges presented encompass various parts of the ultraviolet (UV) and visible spectrum, they do not align with the typical operational wavelengths of atomic absorption spectroscopy. For instance, wavelengths below 200 nm might not be suitable due to the limitations of available light sources and detectors in that spectral region. The visible range (400-800 nm) and the near-infrared range (800-1000 nm) are also less effective for the specific atomic transitions AAS relies on for its measurements.