Abstract
A passive Q-switched Nd:YAG pulsed laser was used to irradiate 99.99% pure Fe target in vacuum ∼10-3 Torr. The CR-39 specimens were exposed to laser produced plasma ions (40-250 keV) emitted along the normal to the Fe target surface. The flux of Fe ions was varied by varying the number of laser shots in the range 500-1500 with an increment of 250. A comparison of structural and optical properties of CR-39 polymer before and after ion implantation was made. The increase in ion flux leads to the transformation of polymer into rather more disordered amorphous state leading to the broadening of XRD peaks. The crystallite size decreases (3.547 to 1.618nm) and Urbach energy increases (0.232 to 0.291eV) exponentially with the increase in ion flux (0 to 6.07 × 105 ions/cm2). Indirect optical band gap is found to decrease (4.118 to 3.917eV) linearly with the increase in ion flux (3.03×105 to 6.07×105 ions/cm2).
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