Effects of 2 mass % Si admixture in a laser-produced Fe plasma

Emission of multiply charged ions and soft x-rays from the plasmas produced by laser pulses focused on (111) surface of Fe and Fe-2 mass % Si single crystals is investigated for wavelengths of 1064 and 248 nm and intensities up to approximate to 1x10(10) W/cm(2). It is demonstrated that the Si admixture in the Fe plasma results in a higher emission of Feq+ ions (1 <= q <= 4) but in a markedly lower x-ray emission. The relation of wavelengths and pulse durations of laser beams used is figured in the fluence dependence of the ion emission