Changes in the Optical Properties of Thermal-Radiation-Modified Polytetrafluoroethylene Exposed to Accelerated Xenon Ions

The interaction characteristics of accelerated 3.2 MeV/nucleon xenon ions with 100 μm-thick thermoradiation-modified polytetrafluoroethylene (TRM-PTFE) films were determined using computer modeling. It was found that, during radiolysis, the initially homogeneous TRM-PTFE sample was transformed into a layered structure including zones of intense and partial radiolysis, as well as a layer of intact polymer. The spatial distribution characteristics of ionization losses and the absorbed dose field in the region of radiation damage around the latent track of a xenon ion were calculated. The optical properties of 100 μm-thick TRM-PTFE films exposed to 3.2 MeV/nucleon xenon ions to a fluence of 1.08 · 10⁶ cm^–2 were studied. The optical spectra of TRM-PTFE exhibit absorption maxima at 206 and 476 (374, 578) nm, which may be due to isolated double bonds and polyene structures containing 14 conjugated double bonds, respectively. Radiation-induced interference was detected, which may be due to the formation of a 0.34–0.39 μm-thick radiation-damaged layer, which may be located at a distance of up to ~36 μm from the surface of the TRM-PTFE sample. A correlation was concluded between the predicted estimates of radiation-induced changes in the optical properties of TRM-PTFE films and the experimental data obtained.

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