Difference between revisions of "Rotational Transitions"
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Latest revision as of 10:02, 20 August 2021
Short Topical Videos
- Rotational Vibrational Coupling (Wikipedia)
- Rovibrational Spectroscopy (UC Davis)
- Rotational Vibrational Spectroscopy (Wikipedia)
Need to Review?
1 Order of Magnitude Energies
Molecules can rotate, and have rotational energies that depend on their angular momentum. If is the quantum angular momentum number,
For small ,
So the electronic, vibrational, and rotational energy states have contributions that scale with the electron-to-nucleus mass ratio:
Rotational energies can be described using the angular momentum number :
where , is the moment of inertia, and for diatomic molecules, we can use the reduced mass :