section_heading: Dunhamov oscilator
paragraph_text: <math>G(v) = \omega_e \left( v + \frac{1}{2} \right) - \omega_e x_e \left( v + \frac{1}{2} \right) ^2 + \omega_e y_e \left( v + \frac{1}{2} \right) ^3 - \omega_e z_e \left( v + \frac{1}{2} \right) ^4 + ...</math>