{ "items" : [
    { "id" : "http://dbpedia.org/resource/Koopmans'_theorem"
      "properties" : {
        "http://www.w3.org/2000/01/rdf-schema#comment" : [ "Koopmans' theorem states that in closed-shell Hartree–Fock theory, the first ionization energy of a molecular system is equal to the negative of the orbital energy of the highest occupied molecular orbital (HOMO)."] } } }
