Vibrational Spectroscopy

Question 1

IR

Answer 1

IR-active modes correspond to change in molecular dipole which behaves in same way as p-orbitals

Question 2

Raman

Answer 2

Raman-active corresponds to change in molecular polarizability which behaves in the same way as the d-orbitals

Question 3

Number of vibrational modes (non-linear)

Answer 3

3N-6

Question 4

Translation

Answer 4

X, y, z in character table

Question 5

Rotations

Answer 5

Rx, Ry, Rz in character table