Rovibrational coupling is a coupled rotational and vibrational excitation of a molecule. It is different from rovibronic coupling, which involves a change in all of electronic, vibrational, and rotational states simultaneously.
Read more about Rotational-vibrational Spectroscopy: Rotational-Vibrational Spectroscopy
Other articles related to "spectroscopy":
... In spectroscopy, the transitions where are referred to as the P-branch ... Rotational-vibrational spectra will also show some fine structure due to the presence of different isotopes in the spectrum ...