The next group to attempt photoionization microscopy used the excitation of Lithium atoms in the presence of a static electric field. This experiment was the first to reveal evidence of quasibound states. A quasibound state is a "state having a connectedness to true bound state through the variation of some physical parameter". This was done by photoionizing the Lithium atoms in the presence of a ≈1 kV/cm static electric field. This experiment was an important precursor to the imaging of the hydrogen wave function because, contrary to the experiments done with Xenon, Lithium wave function microscopy images are sensitive to the presence of resonances. Therefore, the quasibound states were directly revealed.