JUANA VÁZQUEZ AND JOHN F. STANTON, Institute for Theoretical Chemistry, Department of Chemistry, University of Texas, Austin,Tx 78721.
Vibrational corrections to rotational constants due to second vibration-rotation interaction constants, i.e. ^ ij, are presented under the framework of fourth order Rayleigh-Schödinger perturbation theory. Applications to some asymmetric top molecules are analyzed and compared with corrections resulting from the first vibration-rotation constants, ^ i.