Some of the modifications induced in poly(ether-ether-ketone) (PEEK) film irradiated with energetic heavy ions (Ar, Kr or Pb) are determined by gravimetry, SEC and ESR measurements. First etching experiments done on irradiated PEEK film show a preferential ion track etching.
Daubresse, C., Ferain, E., & Legras, R. (1997). Energetic heavy ion tracks in PEEK film. Nuclear Instruments & Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms, 122(1), 89-92. https://doi.org/10.1016/S0168-583X(96)00722-7 (Original work published 1997)