Chapter 43555P43.20The emission energies are the same as the absorption energies, but the final state must be belowvJ==10,bg. The transition must satisfy ∆J=±1, so it must end with J=1. To be lower in energy, itmust be 01,. The emitted photon energy is thereforehfEEhfhfhfvvJJphotonvibrotvibrotvibvibrotrotphotonvibrot=+−+=−−−=−= =1 0eje jThus, fffphotonvibrotHzHzHz=−=×−×=×6 42 10115 106 41 10131113....P43.21The moment of inertia about the molecular axis isImrmx=+=×−252545200 1022152. m.The moment of inertia about a perpendicular axis isRmRmy=FHGIKJ+FHGIKJ=×−2102m.The allowed rotational energies are EIrot=FHGIKJ+=221af, so the energy of the first excited state isEI12==. The ratio is thereforeEEIIIImmxyxyyx1122102152529124558106 25 10,,...=×××−−==mm.Section 43.3Bonding in SolidsP43.22Consider a cubical salt crystal of edge length 0.1 mm.The number of atoms is101049317−−×FHGIKJm0.261 10 m~.This number of salt crystals would have volume
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