Data have been compiled on the cross sections for collisions of electrons and photons with oxygen molecules (O2). For electron collisions, the processes included are: total scattering, elastic scattering, momentum transfer, excitations of rotational, vibrational, and electronic states, dissociation, ionization, and attachment. Ionization and dissociation processes are considered for photon impact. Cross-section data selected are presented graphically. Spectroscopic and other properties of the oxygen molecule are summarized for understanding of the collision processes. The literature was surveyed through August 1987, but some more recent data are included when available to the authors.

Data have been compiled on the cross sections for collisions of electrons and photons with nitrogen molecules (N2). For electron collisions, the processes considered are: total scattering, elastic scattering, momentum transfer, excitations of rotational, vibrational and electronic states, dissociation, and ionization. Ionization and dissociation processes are discussed for photon impact. Cross section data selected are presented graphically. Spectroscopic and other properties of the nitrogen molecule are summarized. The literature was surveyed through the end of 1984, but some more recent data are included when useful.

Capture of negatively charged, heavy particles by hydrogen atoms, i.e., X Ϫ ϩH→X Ϫ pϩe, where X Ϫ ϭp ͑antiproton͒, K Ϫ ͑kaon͒, and Ϫ ͑muon͒, is investigated by carrying out a rigorous full quantum-mechanical ͑QM͒ wave-packet calculation and a semiclassical ͑SC͒ calculation. An empirical law for the capture probabilities, found by the present author ͓Phys. Rev. A 65, 012706 ͑2002͔͒, is examined extensively by using the QM and SC results. The empirical law is useful to obtain reasonably accurate capture cross sections at center-of-mass translational energies less than 10 eV. Furthermore, a local-complex-potential ͑LCP͒ model is employed to discuss a quantum-mechanical effect of the relative motion at very low energies. The LCP calculation shows that a resonance structure is seen in the capture cross section.

Protonium formation in molecular collisions,p + H + 2 (v, j) →pp(n, l) + H(1s), is theoretically investigated. Within the framework of the adiabatic approximation, the four-body (p, p, p, e) problem can be treated as three-body (p, p, H) collisions on a single adiabatic (Born-Oppenheimer) potential energy surface (PES), in the same manner as chemical reaction problems. The adiabatic potential energies of thep + H + 2 system are calculated for various configurations. A classical trajectory Monte Carlo calculation is carried out for the collisions on the adiabatic PES. It is found that the dissociative dynamics plays a critical role in protonium formation, and consequently the molecular target is much more effective in protonium formation than the atomic-hydrogen target.