title: Revealing backward rescattering photoelectron interference of molecules in strong infrared laser fields.
abstract: Photoelectrons ionized from atoms and molecules in a strong laser field are either emitted directly or rescattered by the nucleus, both of which can serve as efficiently useful tools for molecular orbital imaging. We measure the photoelectron angular distributions of molecules (N2, O2 and CO2) ionized by infrared laser pulses (1320 nm, 0.2 ~ 1 × 10(14) W/cm(2)) from multiphoton to tunneling regime and observe an enhancement of interference stripes in the tunneling regime. Using a semiclassical rescattering model with implementing the interference effect, we show that the enhancement arises from the sub-laser-cycle holographic interference of the contributions of the back-rescattering and the non-rescattering electron trajectory. It is shown that the low-energy backscattering photoelectron interference patterns have encoded the structural information of the molecular initial orbitals and attosecond time-resolved dynamics of photoelectron, opening new paths in high-resolution imaging of sub-Ångström and sub-femtosecond structural dynamics in molecules.
authors: Department of Physics and State Key Laboratory for Mesoscopic Physics, Peking University, Beijing 100871, People's Republic of China.
authors: Min
authors: M
authors: Li
authors: Department of Physics and State Key Laboratory for Mesoscopic Physics, Peking University, Beijing 100871, People's Republic of China.
authors: Xufei
authors: X
authors: Sun
authors: Department of Physics and State Key Laboratory for Mesoscopic Physics, Peking University, Beijing 100871, People's Republic of China.
authors: Xiguo
authors: X
authors: Xie
authors: Department of Physics and State Key Laboratory for Mesoscopic Physics, Peking University, Beijing 100871, People's Republic of China.
authors: Yun
authors: Y
authors: Shao
authors: Department of Physics and State Key Laboratory for Mesoscopic Physics, Peking University, Beijing 100871, People's Republic of China.
authors: Yongkai
authors: Y
authors: Deng
authors: 1] Department of Physics and State Key Laboratory for Mesoscopic Physics, Peking University, Beijing 100871, People's Republic of China [2] Collaborative Innovation Center of Quantum Matter, Beijing 100871, China.
authors: Chengyin
authors: C
authors: Wu
authors: 1] Department of Physics and State Key Laboratory for Mesoscopic Physics, Peking University, Beijing 100871, People's Republic of China [2] Collaborative Innovation Center of Quantum Matter, Beijing 100871, China.
authors: Qihuang
authors: Q
authors: Gong
authors: 1] Department of Physics and State Key Laboratory for Mesoscopic Physics, Peking University, Beijing 100871, People's Republic of China [2] Collaborative Innovation Center of Quantum Matter, Beijing 100871, China.
authors: Yunquan
authors: Y
authors: Liu