Reading in Levine: Chapter 19
Homework problems
Hand in on Monday, April 13: 19.29, 19.30,19.35, 19.36, 20.3, 20.6
Key Concepts
Simple molecular orbital theory for H2 overestimates ionic contribution to bonding
Simple valence bond theory for H2 underestimates ionic contribution to bonding
Diatomic molecule term symbols summarize angular momentum and symmetry information about the
electronic state:
2S+1L Examples are 1S and 2P
Selection rules for diatomics:
ΔS=0 ΔL=0,±1 for Hund's cases a) and b). Some additional restrictions based on parity.
Beer-Lambert law
Absorption and emission of radiation for a two-state system; Einstein coefficients
Dipole selection rules
Using the harmonic oscillator and rigid-rotor models to interpret the rovibrational spectral of diatomic molecules.
Rovibronic spectra