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UPSC Combined Geo-Scientist

Chemist

  • 3 descriptive papers
  • 200 marks each
  • 3 h per paper

Mains Paper III covers analytical and organic chemistry.

UPSC Combined Geo-Scientist, Mains · 2017 · Mains Paper III

Q2(b). Doppler broadening

Question

Explain Doppler broadening in AAS.

Answer in brief

Thermal motion gives different atoms different velocity components along the light beam, shifting their resonance frequencies and broadening the line.

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The full model answer

As written for the answer booklet: the diagram carries the working, the lines stay short. Read here only; it is not offered as a download.

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CoversDoppler broadeningAtomic line profiles

All parts of Question 2