A Brief Study of Physical spectroscopy

Spectroscopy which deals with the transition that a molecule undergoes between its energy levels upon absorption of suitable radiations.Rotational-vibrational spectroscopy concerns molecules in the gas phase. There are sequences of quantized rotational levels associated with both the ground and excited vibrational states. The spectra are often resolved into lines due to transitions from one rotational level in the ground vibrational state to one rotational level in the vibrationally excited state. The lines corresponding to a given vibrational transition form a band.