Rotational–vibrational spectroscopy
Rotational–vibrational spectroscopy is a branch of molecular spectroscopy that is concerned with infrared and Raman spectra of molecules in the gas phase. Transitions involving changes in both vibrational and rotational states can be abbreviated as rovibrational (or ro-vibrational) transitions.
Source: Wikipedia — Rotational–vibrational spectroscopy (CC BY-SA 4.0)