BALMER-ALPHA EMISSION IN PROTON-HYDROGEN COLLISIONS

Cross sections for excitation and capture processes into the n = 1, 2, and 3 states (including Balmer-alpha) and ionization have been calcul ated at intermediate proton collision energies with atomic hydrogen. I n addition, the alignment, A(20), and polarization fraction, Pi(E), pa rameters have been calculated. A multi-state close-coupling approach u sing a triple-centre basis set together with selective perturbative me thods are used to make predictions on Balmer-alpha emission. These res ults are compared with the available experimental data and various the oretical investigations for fast protons colliding with atomic hydroge n.