Ionisation of Atomic Hydrogen Under Heavy Particle Impact

Ionisation of hydrogen atoms in ground and metastable 2s states by impact of protons and antiprotons has been studied at collision energies varying from 10 to 1566keV/amu. Total and double differential cross sections are calculated employing a final continuum state wave function which incorporates distortion due to the Coulomb fields of both the projectile and the target nuclei. The present calculated results are compared with the existing experimental findings as well as other theoretical predictions.