Negative Ion Formation in H + H Collisions at Low- to High- Energies

Abstract

Abstract: For various branches of science, it is essential to determine all possible reactions and collisional cross-sections. Despite extensive large-scale studies conducted over the past decades to provide such data, many fundamental atomic and molecular cross-section values remain unknown, and the accuracy of the available data still requires verification. In this paper, we present cross-section calculations for negative ion formation (ion-pair formation) in hydrogen-hydrogen atom collisions based on the classical trajectory and quasi-classical trajectory Monte Carlo models. By comparing our results with available experimental data and theoretical predictions, we find that the QCTMC calculations align well with previous studies. However, the negative ion formation cross-sections obtained using the CTMC model underestimate all previously reported theoretical and experimental values. Nonetheless, the CTMC results show good agreement with the Q-, P-series approximation in the energy range of 1–10 keV. We present negative ion formation cross-sections for impact energies ranging from 1 keV to 100 keV, which are relevant to applications in astronomy, atmospheric sciences, plasma laboratories, and fusion research.