Atomic Emission Spectroscopy
Definition and meaning of Atomic Emission Spectroscopy in chemistry.
Atomic emission spectroscopy (AES) is an analytical technique that identifies and quantifies elements in a sample by measuring the characteristic wavelengths of light emitted when their atoms are excited to higher energy states and return to ground state. The wavelengths of emitted light are unique to each element, enabling precise elemental identification.
In more detail
In AES, a sample is first atomized and excited using a heat source such as a flame, plasma (typically inductively coupled plasma or ICP), or electrical discharge. As the excited atoms return to their ground state, they emit photons at specific wavelengths characteristic of the element. A spectrometer measures these emitted wavelengths and their intensities, creating a spectrum that identifies which elements are present and in what concentrations. AES is widely used in materials analysis, environmental monitoring, and quality control across various industries.
Key facts
| Field | Analytical Chemistry |
|---|---|
| Principle | Measurement of light emitted by excited atoms |
| Common Source | Inductively coupled plasma (ICP) |
| Key Advantage | Simultaneous multi-element analysis |
Inductively coupled plasma atomic emission spectroscopy (ICP-AES) can analyze a water sample suspected of copper contamination by exciting the sample in an ICP torch and measuring the emission at copper's characteristic wavelength of 324.8 nanometers to determine the concentration present.
Frequently asked questions
How is AES different from absorption spectroscopy?
AES measures light emitted by excited atoms, while absorption spectroscopy measures light absorbed by ground-state atoms. AES can analyze multiple elements simultaneously, making it faster for complex samples.
What detection sensitivity does ICP-AES typically achieve?
ICP-AES typically detects elements at concentrations ranging from sub-parts-per-billion (ppb) to parts-per-million (ppm) levels, depending on the element and instrument used.