Two different alkali ions were used to study the role of the ion size on the properties of parasexiphenyl after ion implantation. Cesium ions lead to more pronounced degradations, that is the ceiling fluence is reached with fluence as low as 10(14) ions/cm2. Broken C-H bonds would rearrange themselves into a carbon graphite rich materials or even a diamond like carbon. Oxygen and nitrogen are incorporated upon taking the samples to open air.