Excitation of Atomic Hydrogen to then=2States by 15-200-keV Protons

Abstract

Cross sections for the process ${\mathrm{H}}^{+}$ + H → ${\mathrm{H}}^{+}$ + H* ($n=2\mathrm{}$) are determined from the energy-loss spectra of 15-200-keV protons. After normalization at 200 keV to the Born approximation, the maximum value (1.07 × ${10}^{-16\mathrm{}}$ ${\mathrm{cm}}^2$ at 60 keV) lies below close-coupling calculations and above Glauber-approximation calculations. The agreement with low-energy (5-30-keV) data of others is very good.