Show that the vibrational energy levels Ev for the Morse potential of the previous probl...

Show that the vibrational energy levels Ev for the Morse potential of the previous problem are given by

Where

and n is the vibrational quantum number, m_r is the reduced mass, and E_v ?? D. Find the three lowest energy levels for KCl where D = 4.42 eV, and a = 7.8 nm^-1.