Inelastic cross sections for low-energy Mg + H collisions

16th Russian Youth Conference on Physics and Astronomy

物理学;天文学

Rodionov, D.S.^1 ; Belyaev, A.K.^1 ; Guitou, M.^2 ; Spielfiedel, A.^3 ; Feautrier, N.^3 ; Barklem, P.S.^4

Department of Theoretical Physics, Herzen University, St. Petersburg

191186, Russia^1

Université Paris-Est, Laboratoire Modélisation et Simulation Multi-Echelle, UMR 8208 CNRS, 5 Bd Descartes, Marne-la-Vallée

77454, France^2

LERMA, Observatoire de Paris, Meudon Cedex

92195, France^3

Department of Physics and Astronomy, Uppsala University, Box 516, Uppsala

S-75120, Sweden^4

关键词: Endothermic process;    Excitation process;    Inelastic cross sections;    Inelastic process;    Ion pair formation;    Molecular state;    Non-adiabatic transitions;    Quantum calculation;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/572/1/012010/pdf
DOI  :  10.1088/1742-6596/572/1/012010

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

Quantum calculations of cross sections for the inelastic processes in Mg + H collisions are improved. It is shown that the largest cross section among the endothermic processes with the value of approximately 80 Å2corresponds to the process of the ion-pair formation: Mg(3s4s1S)+H → Mg+ + H-. The mechanism of the process is based on nonadiabatic transitions between the MgH(2Σ+) molecular states, which provide the main mechanism for inelastic processes in Mg + H collisions. On the other hand, nonadiabatic transitions between MgH(2II) states affect some cross sections rather significantly. For example, transitions between the MgH(2II) states increase the cross section for the excitation process Mg(3s3p1P)+H → Mg(3s3d1D)+H almost by an order of magnitude as compared to the cross section obtained within the MgH(2Σ+) symmetry.