The Charge State of Protons with 90 and 100 keV Energies Decelerated in Hydrogen Plasma

Energy loss of protons with 90 and 100 keV energies penetrating through a hydrogen plasma target has been measured, where the electron density is about 1016 cm?3 temperature 1-2 eV. It found that energy in obviously larger than cold gas experimental results based on Bethe model calculations can be demonstrated by variation effective charge plasma. The remains 1 for protons, while value decreases to 0.92. Moreover, two empirical formulae are employed extract charge.