Question

What are kind transitions does UV-Vis measure? (i.e. purely vibrational, rotational, etc.)?

Answer 1

UV-Vis deals with the transitions which are resulted from induced dipole moment in the molecule.

As the energy of UV-Vis electromagnetic wave is very high it doesn't need to operate on permanent dipole or change in dipole, unlike the other spectroscopic methods.

The fundamental of UV-Vis spectroscopy is based upon the absorption of photons of a UV-Vis range which has the ability to excite the electrons to a higher energy state.

In total 4 types of transitions are allowed. i.e