Double ionization of water molecule induced by swift H+

29th International Conference on Photonic, Electronic, and Atomic Collisions

Tavares, A.C.^1 ; Luna, H.^2 ; Wolff, W.^2 ; Montenegro, E.C.^2

Departamento de Física, Pontificia Universidade Católica Do Rio de Janeiro, Rio de Janeiro, RJ

22451-900, Brazil^1

Instituto de Física, Universidade Federal Do Rio de Janeiro, Rio de Janeiro, RJ

21941-972, Brazil^2

关键词: Charge-transfer reactions;    Coincidence techniques;    Collision process;    Collisional contributions;    Direct double ionization;    Electron vacancies;    Fragmentation channels;    Model calculations;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/635/3/032074/pdf
DOI  :  10.1088/1742-6596/635/3/032074

来源: IOP

【 摘 要 】

Experimental cross sections for single and double ionization of H2O by swift H+with energy ranging from 0.5 to 2.0 MeV are reported. In this energy range the ionization is the dominant collision process and charge transfer reactions can be disregarded. A multi-hit coincidence technique was used to measure the H++ OH+and H++ O+fragmentation channels. A model calculation allowed us to separate the post collisional contribution from the direct double ionization process, whenever an electron vacancy occurs in the 2a1 molecular orbital.