He(2(3)S) Penning ionization of HCl and HBr leading to HCl+(A) and HBr+(A) has been studied optically by using a crossed-beam apparatus. The ratios of the vibrational population, P-nu/P-0 (nu' = 2 and 3) of HCl+(A) and P-1/P-0 of HBr+(A), increase with the collision energy in the region of 120-200 meV. The rotational distributions of HCI+(A, nu'= 0) and HBr+(A, nu'= 0) can be represented by a double-Boltzmann distribution; the temperatures are 200 +/- 50 and 700 +/- 80 K for HCI+(A, nu'= 0) and 250 +/- 50 and 1200 +/- 200 K for HBrl(A) and are nearly independent of the collision energy. The bimodal rotational distributions suggest that at least two processes contribute to formation of these ions. The model potential surface calculated for He*(Li) + HCl as the entrance channel is nearly isotropic and shows a shallow well of about 20 meV, whereas the surface for He + HCI+(A) as the exit channel is anisotropic and shows a deep minimum of 250 meV in the He-H-Cl collinear direction. Dynamical effects of the anisotropic attractive structure in the exit surface are proposed to account for the observed results.