Abstract
We have measured the energy of the directed motion of multiply charged ions produced when solid targets are exposed to low-contrast (10-3- 10-2) femtosecond laser pulses with intensities 10 15-1016 W cm-2. The measurements are based on the recording of spatially resolved X-ray spectra for H-and He-like oxygen ions in the target plane. Analysis of the Heβ and Ly α line profiles has revealed fractions of accelerated ions in plasma with energies from several to several tens of kiloelectronvolts. We show that using a layer of frozen nanometer-size water droplets as the targets leads to an effective absorption of laser pulses and a twofold rise in the energy (to 0.1 MeV) of He-like oxygen ions compared to the use of solid targets.
Original language | English |
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Pages (from-to) | 351-355 |
Number of pages | 5 |
Journal | Journal of Experimental and Theoretical Physics |
Volume | 107 |
Issue number | 3 |
DOIs | |
State | Published - Sep 2008 |