Classical radiation spectra of long-lived H+ 3-complexes

Spectral analysis was performed of classical trajectories simulating collisions of H⁺ with H₂ which form long-lived complexes. The dipole moment μ(t) and several geometrical variables are analysed, and their spectra shown and interpreted in terms of known dynamical features of the motion. Correspondence with Einstein's A- and B-coefficients is used to derive estimates for the rates of the spontaneous and induced (laser-assisted) radiative association reaction H⁺ + H₂ → H⁺ ₃ + hv.