Multicolor radiography is used for the characterization of atoms, ions, and molecules of carbon plasma plumes formed by focusing a 200 ps Ti: sapphire laser pulse on a solid graphite target. The radiography of the plume was carried out using a high order harmonic generation based radiation source consisting of the 11th (lambda approximate to 72.7 nm) to 21st (lambda approximate to 38 nm) odd harmonic orders of the Ti: sapphire laser pulse. The density profile of CI, CII, and carbon dimer molecule (C-2) is estimated from the 2D-transmission profile of the harmonics, recorded after passing through the carbon plume. The peak densities of CI, CII, and C-2 at a 50 ns delay are estimated to be 8 x 10(24) m(-3), 4 x 10(24) m(-3), and 3.5 x 10(23) m(-3) at distances of 150 mu m, 170 mu m, and 120 mu m away from the target surface, respectively. The expansion speed of the plasma plume front is estimated to be 2 x 10(4) m/s and the speed of the C-2 molecule to be 4 x 10(3) m/s at a laser intensity of 10(11)Wcm(-2). The present study demonstrates ultrafast multicolor radiography as a simple and versatile tool for a simultaneous estimation of the density profile of neutral atoms, ions, and molecular species of the plasma plume. Published under license by AIP Publishing.
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