Isotope separation is an important field of scientific research. Many methods have been used to separate elements and isotopes. The two main processes used at present are diffusion and centrifuging. In the second category, rotating plasmas may be of importance due to the high rotational velocities which can be obtained. This thesis describes an experimental study of isotopic enrichment in a rotating neon plasma. Some of the theoretical considerations are also presented and a new theory of isotopic separation in rotating plasmas is formulated.