Abstract
An experimental study of space-resolved x-ray emission from a laser produced magnesium plasma expanding in a helium gas background has been performed at different gas pressures up to 125 mbar. A strong enhancement in MgXI He-α resonance (1s<sup>2</sup> <sup>1</sup>S<sub>o</sub> - 1s2p <sup>1</sup>P<sub>1</sub> at 9.17Å) and intercombination (1s<sup>2</sup> <sup>1</sup>S<sub>o</sub> - 1s2p <sup>3</sup>P<sub>1</sub> at 9.23Å) line emission is observed in the blast wave region extending upto ~6 mm from the target. Results of measurements of pressure dependence of peak x ray line intensity, onset distance, size of the emission region, and intensity ratio of the two lines are described and the role of background gas to explain the observed behavior is discussed. At optimum background pressure of about 40 mbar there is an order of magnitude increase in the x-ray line intensity compared to that for a gas pressure of few mbar. Charge exchange and three body recombination rates have also been analyzed for their relative contribution towards this intensity enhancement.
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