Lecture 34 Rotational spectroscopy: intensities. Rotational spectroscopy. In the previous lecture, we have considered the rotational energy levels. In this lecture, we will focus more on selection rules and intensities. Selection rules and intensities (review). Transition dipole moment
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Oscillating electric field (microwave)
No electronic / vibrational transition
How could astrochemists know H2O exist in interstellar medium?
x2 + y2 + z2~ Y0,0
xy, etc. are essentially Y0,0, Y2,0, Y2,±1, Y2,±2
Linear rotors: ΔJ = 0, ±2
Spherical rotors: inactive (rotation cannot change the polarizability)
Nuclear (proton) spins
With respect to interchange (180° molecular rotation)