Nonsequential double ionization of helium in IR+XUV two-color laser fields II: collision-excitation ionization process
文献类型：期刊论文
| 作者 | Yan,Zong-Chao4; Jin,Facheng2,5; Chen,Jing1; Yang,Yujun6; Liu,Xiaojun3; Wang,Bingbing5 |
| 刊名 | Journal of Physics B: Atomic, Molecular and Optical Physics
 |
| 出版日期 | 2018-01-08 |
| 卷号 | 51期号:3 |
| 关键词 | nonsequential double ionization IR+XUV two-color laser fields helium atom momentum spectrum 42.65.-k 42.50.Hz 32.80.Rm |
| ISSN号 | 0953-4075 |
| DOI | 10.1088/1361-6455/aa9e7f |
| 英文摘要 | Abstract We recently investigated the collision-ionization mechanism of the nonsequential double-ionization (NSDI) process in IR+XUV two-color laser fields [(2016) Phys. Rev. A 93 043417]. Here, we extend this work to study the collision-excitation-ionization (CEI) mechanism of the NSDI processes in the two-color laser fields with different laser conditions. It is found that the CEI mechanism makes a dominant contribution to the NSDI as the extreme ultraviolet (XUV) photon energy is smaller than the ionization threshold of the He+ ion, and the momentum spectrum shows complex interference patterns and symmetrical structures. By channel analysis, we find that, as the energy carried by the recollision electron is not enough to excite the bound electron, the bound electron will absorb XUV photons during their collision; as a result, both forward and backward collisions make a comparable contribution to the NSDI processes. However, it is found that, as the energy carried by the recollision electron is large enough to excite the bound electron, the bound electron does not absorb any XUV photon and it is excited only by sharing the energy carried by the recollision electron, hence the forward collision plays a dominant role in the NSDI processes. Moreover, we find that the interference patterns of the NSDI spectra can be reconstructed by the spectra of two above-threshold ionization (ATI) processes, which may be used to analyze the structure of the two separate ATI spectra by NSDI processes. |
| 语种 | 英语 |
| WOS记录号 | IOP:0953-4075-51-3-AA9E7F |
| 出版者 | IOP Publishing |
| 源URL | [http://ir.wipm.ac.cn/handle/112942/12302]  |
| 专题 | 中国科学院武汉物理与数学研究所 |
| 作者单位 | 1.Institute of Applied Physics and Computational Mathematics, P. O. Box 8009, Beijing 100088, People's Republic of China 2.Faculty of Science, Xi’an Aeronautical University, Xi’an 710077, People's Republic of China 3.State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, People's Republic of China 4.Department of Physics, University of New Brunswick, Fredericton, New Brunswick, E3B 5A3, Canada 5.Laboratory of Optical Physics, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China 6.Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, People's Republic of China |
| 推荐引用方式 GB/T 7714 | Yan,Zong-Chao,Jin,Facheng,Chen,Jing,et al. Nonsequential double ionization of helium in IR+XUV two-color laser fields II: collision-excitation ionization process[J]. Journal of Physics B: Atomic, Molecular and Optical Physics,2018,51(3). |
| APA | Yan,Zong-Chao,Jin,Facheng,Chen,Jing,Yang,Yujun,Liu,Xiaojun,&Wang,Bingbing.(2018).Nonsequential double ionization of helium in IR+XUV two-color laser fields II: collision-excitation ionization process.Journal of Physics B: Atomic, Molecular and Optical Physics,51(3). |
| MLA | Yan,Zong-Chao,et al."Nonsequential double ionization of helium in IR+XUV two-color laser fields II: collision-excitation ionization process".Journal of Physics B: Atomic, Molecular and Optical Physics 51.3(2018). |
入库方式： OAI收割
来源：武汉物理与数学研究所
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