Questions and Answers
What does atomic absorption spectroscopy (AAS) quantify?
The absorption of light by ground state metal atoms in the gaseous state
Which type of radiation is involved in atomic absorption and emission spectroscopy?
UV: 180-380 nm, Visible: 380-780 nm
What type of transition occurs in atomic emission spectroscopy?
Electronic: Valence electrons promoted to higher energy levels, followed by decay to intermediate or ground state level
What elements can be analyzed by atomic absorption spectroscopy?
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What process is measured in atomic absorption and emission spectroscopy?
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Study Notes
Atomic Absorption and Emission Spectroscopy
- Atomic absorption spectroscopy (AAS) measures light absorption by ground state metal atoms in the gaseous state
- Atomic emission spectroscopy (AES) measures light emission by excited state metal atoms in the gaseous state
- AAS can analyze atoms and ions of metals for qualitative and quantitative analysis of over 70 elements
- AAS is widely used for metal analysis
- AES can't analyze elements highlighted in white on the periodic table
- UV radiation ranges from 180-380 nm, visible radiation ranges from 380-780 nm
- Interaction of UV-visible radiation with metals causes changes in electron distribution of valence electrons
- AAS measures absorption, AES measures emission, and AFS measures fluorescence
- The type of transition involved is electronic, where valence electrons are promoted to higher energy levels and then decay to intermediate or ground state level (emission)
