Angular distribution of ions emitted from Nd:YAG laser-produced plasma
L. LáskaInstitute of Physics, ASCR, Na Slovance 2, 182 21 Prague 8, Czech RepublicJ. KrásaInstitute of Physics, ASCR, Na Slovance 2, 182 21 Prague 8, Czech RepublicM. PfeiferInstitute of Physics, ASCR, Na Slovance 2, 182 21 Prague 8, Czech RepublicK. RohlenaInstitute of Physics, ASCR, Na Slovance 2, 182 21 Prague 8, Czech RepublicS. GamminoINFN-Laboratori Nazionali del Sud, Via S. Sofia 44, 95123, Catania, ItalyL. TorrisiINFN-Laboratori Nazionali del Sud, Via S. Sofia 44, 95123, Catania, ItalyL. AndòINFN-Laboratori Nazionali del Sud, Via S. Sofia 44, 95123, Catania, ItalyG. CiavolaINFN-Laboratori Nazionali del Sud, Via S. Sofia 44, 95123, Catania, Italy
2002en
ABI
Annotatsiya
Angular distribution of ion currents emitted from laser-produced plasmas are reported for a Nd:YAG laser with intensities lower than 1×1010 W/cm2. This distributions are strongly peaked along the normal to the target surface for Cu, Sn, Ta, W, Au, and Pb ion streams, independent of the incidence angle of the irradiated target. For Al, Ni, and Nb the main axis tends to decline to about −10°. The comparison of fits of Gaussian function and cosP(α−α0)+y0 to the experimental data verified the formal equivalency of both the functions. Fitted values of the FWHM and of the exponent P are compared for all the elements used. The angular distribution of mean ion velocity 〈v〉 and ion kinetic energy 〈E〉 are presented.
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