| ATOMIC AND MOLECULAR PHYSICS |
|
|
|
|
Double Ionization Dynamics of Molecular Hydrogen in Ultrashort Intense Laser Fields |
| Yong-Ju Chen1,2, Shao-Gang Yu1,2, Ren-Ping Sun1,2, Cheng Gong1, Lin-Qiang Hua1, Xuan-Yang Lai1, Wei Quan1, Xiao-Jun Liu1** |
1State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071
2University of Chinese Academy of Sciences, Beijing 100049
|
|
| Cite this article: |
|
Yong-Ju Chen, Shao-Gang Yu, Ren-Ping Sun et al 2016 Chin. Phys. Lett. 33 043301 |
|
|
|
|
Abstract We experimentally investigate the double ionization of molecular hydrogen subjected to ultrashort intense laser pulses. The total kinetic energy release of the two coincident H$^{+}$ ions, which provides a diagnosis of different processes to double ionization of H$_{2}$, is measured for two different pulse durations, i.e., 25 and 5 fs, and various laser intensities. It is found that, for the long pulse duration (i.e., 25 fs), the double ionization occurs mainly via two processes, i.e., the charge resonance enhanced ionization and recollision-induced double ionization. Moreover, the contributions from these two processes can be significantly modulated by changing the laser intensity. In contrast, for a few-cycle pulse of 5 fs, only the recollsion-induced double ionization survives, and in particular, this process could be solely induced by the first-return recollision at appropriate laser intensities, providing an efficient way to probe the sub-laser-cycle molecular dynamics.
|
|
|
Received: 22 January 2016
Published: 29 April 2016
|
|
| PACS: |
33.80.Wz
|
(Other multiphoton processes)
|
| |
34.50.Rk
|
(Laser-modified scattering and reactions)
|
| |
42.50.Hz
|
(Strong-field excitation of optical transitions in quantum systems; multiphoton processes; dynamic Stark shift)
|
|
|
|
|
|
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
