Apparatus to separate at least one isomeric form of a sample from other isomeric forms of the sample, where the sample is comprised of a molecule or a cluster of molecules, comprising:
- an optical excitation system for raising an electron of the sample to a Rydberg state having an orbital diameter sufficient to encompass at least a portion of the sample, and for further raising the electron to an ionization state;
- means for identifying the desired isomeric form of the sample from the energy required to transition from the Rydberg state to the ionization state;
- and
- means, responsive to identifying the desired isomeric form of the sample, for physically segregating the identified sample having the desired isomeric form from other samples having other isomeric forms.