Physics · Molecular Spectroscopy

The vibrational energy for a diatomic molecule is given by G(v) = (v + 1/2)νe − (v + 1/2)2νexe, where νe is the fundamental frequency and xe is the anharmonicity constant. The infrared spectrum of BeO molecule in an excited state shows two transitions at 1078.48 cm−1 and 1062.42 cm−1, identified as transitions between vibrational levels 2 → 3 and 3 → 4, respectively. The νe and νexe (in cm−1) for BeO molecule in this state, respectively, are