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物理学报 1985
ON THE LINE BROADENING AND SHIFTS OF Al-LASER PRODUCED PLASMA
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Abstract:
We have studied the spatially resolved spectra of Allaser produced plasma. In the range from 2300-4000 ? about thirty emission lines have been observed belonging to the neutral, singly and doubly ionized Al species. Their line widths and shifts vary with the distance between the plasma and the Al-target surface. Five lines from differently ionized species have been examined with the aid of the theoretical formula given by Griem, and the distribution of electron density near the target has been determined semi-empirically. We found that the line broadening of the different species coincided well with each other, and could be used as a measure of electron density in the range from 1·1017 to 5·1018cm-3. But the coincidence between the line shifts seems not so good, especially for the lines of 3587 ? of Al II and 3610 ? of Al III. It remains to be further investigated.
