X-ray Fluorescence Spectroscopy
Definition and meaning of X-ray Fluorescence Spectroscopy in chemistry.
X-ray fluorescence spectroscopy is an analytical technique that uses high-energy X-rays to excite inner shell electrons in atoms, causing them to emit characteristic X-rays whose energies identify the elemental composition of a sample.
In more detail
When an X-ray photon strikes an atom, it ejects an inner shell electron, creating a vacancy. An electron from a higher shell drops to fill this vacancy, emitting a characteristic X-ray photon. Each element produces X-rays at distinct energies determined by its atomic number. By detecting and measuring these energies, scientists identify and quantify elements present. The technique is non-destructive, enabling simultaneous analysis of multiple elements.
Key facts
| Abbreviation | XRF |
|---|---|
| Field | Analytical Chemistry |
| Principle | Detection of characteristic X-rays from electron shell transitions |
| Applications | Non-destructive elemental composition analysis of minerals, alloys, and artifacts |
An archaeologist uses XRF spectroscopy to determine whether a bronze artifact contains copper and tin in ratios consistent with ancient metalwork, without damaging the piece.
Frequently asked questions
Is XRF destructive to samples?
No. XRF is non-destructive and causes no permanent sample damage, making it ideal for analyzing archaeological artifacts and museum pieces.
What elements can XRF detect?
XRF can detect elements from sodium (Na) through uranium (U), with detection sensitivity varying by instrument configuration and sample matrix.