Roughly speaking , a molecular energy state , i.e. an eigenstate of the molecular Hamiltonian , is the sum of the electronic , vibrational , rotational , nuclear , and translational components , such that : where is an eigenvalue of the electronic molecular Hamiltonian ( the value of the potential energy surface ) at the equilibrium geometry of the molecule .
Roughly speaking , a molecular energy state , i.e. an eigenstate of the molecular Hamiltonian , is the sum of an electronic , vibrational , rotational , nuclear and translational component , such that : where formula_15 is an eigenvalue of the electronic molecular Hamiltonian ( the value of the potential energy surface ) at the equilibrium geometry of the molecule .