Optical properties of laser-produced plasmas from Cd and layered crystalline CdAl2Se4 targets |
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Authors: | A K Shuaibov L L Shimon M P Chuchman |
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Institution: | (1) Uzhgorod State University, Uzhgorod, 88000, Ukraine |
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Abstract: | An experimental investigation into emission by plasmas from Cd and crystalline CdAl2Se4 targets irradiated with a pulse-periodic YAG: Nd3+ laser is presented. The laser operates at a pulse width of 20 ns and provides 1?2×109 W/cm2 at the focus. The spectral and time characteristics of the emission are examined. The main findings are as follows: (1) The strongest lines correspond to the transitions from the 63 S 1 and 53 D 2 levels of Cd I. (2) With the Cd target, the recombination bottlenecks are 52 D 5/2 of Cd II (E up=20.11 eV) and 83 D 1, 3 of Cd I (E up=8.60–8.65 eV). (3) The average electron temperature outside the core of the plume is 0.64 eV. (4) For the 508.6-nm line of Cd I, the high filling rate of the 63 S 1 upper energy level may be related to the rapid recombination of cadmium ions with electrons via the intermediate levels of Cd? at 6.82 and 7.24 eV. |
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