Observation of high-energy electrons from a metal target irradiated by protons with a mean energy of 25 keVстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Electrons with abnormally high energies of up to 16 keV are detected from an iron target irradiated by ions (H(+), Fe(+), Fe(2+), Fe(3+)) with energies ranging from 20 to 100 keV from the plasma of a high-power femtosecond laser pulse with an intensity of 10(16) J/(s cm(2)). These electrons indicate that the energy of an incident ion is almost completely transferred to an electron knocked out of the target. In a range of 6-16 keV, the spectrum of electrons knocked out of the K shell of iron atoms by protons with an energy of 22 +/- 2 keV is quasi-exponential with an exponent of 4 keV. For 8-keV electrons, the double differential cross section for ionization by such protons is estimated as 10(-7) b/(eV sr).