Rotation-Vibration-Electronic Energy Levels and Standard Notation

1 Rotation-Vibration-Electronic Energy Levels and Standard Notation 

Energy in diatomic molecules is distributed among three kinds of internal excitations rotational, vibrational, and electronic. The rotational energy is described empirically by a truncated (denoted by. .. ) series in J( J + 1), 

Re is the equilibrium internuclear distance. The Bv and Dv constants are weakly u-dependent, but strongly dependent on electronic state. 

The vibrational energy is described empirically by a truncated power series in v + 1/2, 

Vibrational-rotational molecular constants, and structural quantities (harmonic force constant, k, and equilibrium internuclear distance, Re) derived from these constants are listed in Table 1.1 for the electronic ground states of three 

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