Discuss the three basic types of molecular spectroscopy

$1-$ Rotational $($microwave$)$ spectroscopy

$2-$ Vibrational $($infrared$)$ spectroscopy

$3-$ Electronic spectroscopy $($Ultraviolet$-$Visible$)$

Your report should include the following :

$-$Theoretical background in terms of models and principles involved $($e$.$g$.,$ the rigid rotor harmonic oscillator, and Franck$-$Condon principle$),$ the separation of energy levels and the selection rules.

$-$The conditions for each types of spectroscopy and the types of molecules involved with examples.

$-$The information inferred from each types of molecular spectroscopy and structure elucidation and spectra interpretation with examples.

$-$Brief illustrations for spectrophotometers for each types of spectroscopy.

$-$Types of electronic excitations $($e$.$g$.,n{}^{**}$ and ${}^{**}),$ fluorescence and phosphorescence.

$-$General info like spectral range and units.