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Examples of Ta-plasma soft x-ray emission spectrum (thick gray line) and Si-absorption spectrum (thin black line). Absorption coefficient, , is defined as , where , , and are the photon energy, the emission and the transmission spectra, respectively. Each data consists of 1200 shots.
(a) EXAFS spectrum extracted from the EXAFS region of the absorption spectrum by subtracting the background based on the Victoreen formula and converting the subtracted oscillation to the oscillation as a function of electron wave number; (b) Fourier transformation of the EXAFS spectrum.
Absorption spectra of Si with (thin black line) and without (thick gray line) laser irradiation at various time delays. The insets show the expansion plots near the edge (right) and the edge (left), respectively.
Transient EXAFS spectra at various time delays (thin black line). Unpumped data are also shown for comparison (thick gray line).
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