50 keV/u Ne^(8+)与CO转移电离反应中分子轴取向效应测量

Orientation Effect in Transfer Ionization Processes of 50 keV/u Ne^(8+) Impact on CO

利用反应显微成像谱仪,研究了50 keV/u Ne^(8+)碰撞CO转移电离反应中生成的CO^(2+)碎裂过程。通过重构分子离子爆炸碎片C^+和O^+的三维动量,获得了质心系中CO^(2+)碎裂过程中释放的动能(KER)。在KER谱中发现了来自亚稳态~1Σ^+,~1Π,~3Π解离的峰、~3Σ^+态解离的峰和~1Σ^+(II)态解离的峰,同时发现了排斥态~3Σ^-的贡献。在~3Σ^-态解离的分子轴取向分布中,首次观测到CO^(2+)解离的分子轴取向效应。

The fragmentations of CO2＋ are studied in transfer ionization processes of 50 ke V/u Ne8＋ impact on CO with reaction microscopes. The 3D momenta of C＋ and O＋ were measured, and the kinetic energy release（KER） of dissociative（CO2＋） was obtained accordingly. The peaks resulted from the metastable states of 1Σ~＋,~1Π and 3Π, of 3Σ~＋, and of 1Σ~＋（II）are identified in KER spectrum. Meanwhile, the repulsive state of 3Σ^- was also observed, which forms a broad peak lying between the peaks of ~3Σ~＋ and 1Σ~＋（II）. In the CO2＋ dissociations from 3Σ^- state, the orientation effect of CO molecular axis was observed for the first time.