Answer the following problems.
problem 1) Describe briefly the origin of of molecular spectra.
problem 2) describe the allowed transitions in the rotational energy levels of molecules.
problem 3) Give the account of isotopic effect in rotational spectra.
problem 4) describe the spectra of rigid and non rigid rotor systems.
problem 5) What are the sources of radiation and detectors used in recording the NMR and ESR spectra of molecules.
problem 6) Give the account of microwave spectra of linear molecules.
problem 7) Describe the origin of electronic spectra of molecules.
problem 8) Give the account of vibrational energy levels and transitions of a diatomic molecule.