UV–visible and infrared spectroscopic studies of Li3+ and C5+ irradiated PADC polymer

125 μm Thick PADC polymer samples were irradiated by 50 MeV Li3+ ions and 250 μm thick PADC polymer samples were irradiated by 70 MeV C5+ ions. The optical absorption edge shifted towards the visible region of the spectrum with the increase of ion fluence signifying the decrease in the band gap energy in both cases. There was larger decrease in the band gap energy value in carbon ions irradiated samples as compared to lithium ions irradiated samples. Increase in number of carbon hexagon rings per cluster was verified by modified Robertson equation. The Urbach’s energy calculations showed the thermal fluctuations in the band gap energy values. The FTIR spectrum showed the reduction in absorbance (higher percentage transmittance) of typical bands at higher fluences in case of lithium ion irradiation. The carbon ion irradiation showed little modification in chemical studies.