Graph of basic experimental setup. One typical image of the backlighter is shown at the top right. Besides the uniform backlighting area in the circled center, a ring of weak x-ray emission also exists, indicating the expansion of the plasma. A typical spatial and temporal image of the backlighter and the Planckian radiation is also shown at the down left.
Film recorded absorption spectra at three delay times of (a) 1.0 ns, (b) 1.5 ns, and (c) 2.0 ns. (a) and (b) were measured when the PET crystal was aligned along the central line of the backlighter and the sample, and (c) was measured for the sample plasmas centered around the position at away from the central line. (d) is the time-integrated self-emission spectra of the sample plasma. Emission lines from the fluorinlike and heliumlike silicon ions dominate the whole spectra.
Comparisons between the measured absorption spectra of plasmas at the sample central region (dashed lines) and the calculation results (solid lines) at delay times of 1.0, 1.5, and 2.0 ns, respectively.
Contributions of Li-like and O-like silicon ions to the whole absorption spectra at delay time of 1.5 ns. The dashed line is the absorption spectra of B-like silicon ions having electronic configurations with the maximum principal quantum number . Its intensity was increased by 0.1 manually for the clearness aim. The dotted line is the measured absorption spectra of plasmas in the central sample region.
The temporally and spatially resolved characteristics of silicon dioxide aerogel plasmas. (a) The electron temperature (squares and circles are for time delay of 1.0 and 1.5 ns, respectively; up-triangles and down-triangles are for different groups of LTE plasmas at 2.0 ns) and the electron density (solid squares and solid circles are for delays of 1.0 and 1.5 ns, respectively; solid up-triangles and down-triangles are for different groups of LTE plasmas at the time delay of 2.0 ns). (b) The areal density (solid squares, solid circles, and solid up-triangles are for delays of 1.0, 1.5, and 2.0 ns, respectively) and the volume density (squares and circles are for delays of 1.0 and 1.5 ns, respectively; up-triangles and down-triangles are for different groups of LTE plasmas at the time delay of 2.0 ns).
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