Question
Give the selection rules and the schematic diagram of the vibration-rotation
Raman spectrum of a diatomic gas.
Answer :
Word Count : 367
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In Raman spectroscopy, the vibration-rotation Raman spectrum of a diatomic gas involves transitions between different rotational and vibrational energy levels. The selection rules for vibration-rotation Raman transitions in a diatomic molecule are as follows:
1. Rigid Rotor Approximation:
- The molecule is treated as a rigid rotor, meaning that the bond length remains constant during the vibration.
- Changes in vibrational and rotational quantum numbers (Δv and ΔJ) are limited to specific values.
2. Raman Selection Rules:
- For a pure rotational
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