Polyatomic Vibrations Flashcards
1
Q
Number of vibrations for linear molecules
A
3N-5
2
Q
Number of vibrations for non-linear molecules
A
3N-6
3
Q
Internal rotation
A
Rotation of one part of the molecule with respect to the rest of it
4
Q
Where are local modes used
A
Spectroscopic assignments
5
Q
Normal mode
A
All nuclei undergo simple harmonic motion with same frequency and in phase but different amplitudes
6
Q
What happens to centre of mass in a vibration
A
Stays fixed
7
Q
Bending modes are
A
Degenerate
