Atomic Absorption Spectroscopy (AAS) Quiz
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Questions and Answers

Atomic absorption spectroscopy AAS is a spectroanalytical technique for the quantitative determination of chemical elements employing the absorption of light by ______ atoms in the gaseous state.

free

In analytical chemistry, this technique is used for determining the concentration of a particular element in a sample to be analyzed by ______ the light.

absorbing

What happened when atoms ______ the light.

absorb

Atoms undergo only ______ transition, no vibrational or rotational transitions.

<p>electronic</p> Signup and view all the answers

The linewidth of an atomic line is defined as its width in wavelength units when measure at one half the maximum ______.

<p>signal</p> Signup and view all the answers

Explain the principle behind atomic absorption spectroscopy.

<p>Atomic absorption spectroscopy is based on the principle that atoms in the gaseous state absorb light at specific wavelengths, resulting in the reduction of light intensity.</p> Signup and view all the answers

What causes the sharp absorption peaks in sodium vapor at 589.0 and 589.6nm?

<p>The sharp absorption peaks in sodium vapor at 589.0 and 589.6nm are caused by the excitation of 3s electrons to two 3p states.</p> Signup and view all the answers

What is the nature of broadening observed in atomic absorption spectroscopy?

<p>The broadening observed in atomic absorption spectroscopy can be attributed to two factors: uncertainty effect (lifetime of excited states) and collisional broadening (collisions with other atoms/ions in the heated medium).</p> Signup and view all the answers

What is the definition of linewidth in atomic absorption spectroscopy?

<p>Linewidth in atomic absorption spectroscopy is defined as the width of an atomic line in wavelength units when measured at one half the maximum signal.</p> Signup and view all the answers

Which types of transitions do atoms undergo when they absorb light in atomic absorption spectroscopy?

<p>In atomic absorption spectroscopy, atoms undergo only electronic transitions, with no vibrational or rotational transitions.</p> Signup and view all the answers

Study Notes

Atomic Absorption Spectroscopy (AAS)

  • AAS is a spectroanalytical technique used for the quantitative determination of chemical elements.
  • It involves the absorption of light by free atoms in the gaseous state.

Principle of AAS

  • Atoms absorb light and undergo electronic transitions, but not vibrational or rotational transitions.
  • When atoms absorb light, they exhibit characteristic absorption peaks.

Example: Sodium Vapor

  • Sodium vapor exhibits two sharp absorption peaks at 589.0 and 589.6 nm due to excitation of 3s electrons to two 3p states.

Linewidth

  • The linewidth of an atomic line is defined as its width in wavelength units when measured at one half the maximum signal.
  • There are two types of broadening that affect the linewidth: Natural Broadening and Collisional Broadening.

Natural Broadening (Uncertainty Effect)

  • The lifetime of the excited states leads to uncertainty.
  • A lifetime of 10^(-8) seconds leads to a width of 10^(-5) nm.

Collisional Broadening (Pressure Effect)

  • Collisional broadening occurs due to the collision of the emitting/absorbing species with other atoms/ions in the heated medium.

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Test your knowledge of Atomic Absorption Spectroscopy (AAS) with this quiz! Learn about how atoms absorb light and explore the application of AAS in determining the concentration of sodium in a sample.

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