Spaceresolved Xray spectrum emitted from laserproduced gold plasma and its applications

On the XingguangII laser facility, one dimensional spaceresoved Mband spectra on Au plasmas produced laser irradiation of a plane target were measured by using a PET crystal spectrometer coupled with a slit of 20μm in width. In the experimental spectra, electric quadrupole transition line 3p63d10(1S0)3p53d104d(3/2,5/2)J=1 of Nilike Au was observed, and according to the sensitive characteristic of this line to electron density, diagnostics of the electron density of Au plasmas were discussed. In conclusion, the use of electric quadrupole line as a diagnostic tool of electron density is available in the range of about 1019～ 4.5×1021cm-3.