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Timing angular momentum transfer for parity-unfavored transitions in multiphoton ionization

Meng Han1, Hao Liang1, Peipei Ge1, Yiqi Fang1, Zhenning Guo1, Xiaoyang Yu1, Yongkai Deng1, Liang-You Peng1,2,4, Qihuang Gong1,2,4 et al.

Yunquan Liu1,2,3,4,*

  • 1State Key Laboratory for Mesoscopic Physics, Frontiers Science Center for Nano-Optoelectronics, Collaborative Innovation Center of Quantum Matter, School of Physics, Peking University, Beijing 100871, China
  • 2Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, Shanxi 030006, China
  • 3Center for Applied Physics and Technology, HEDPS, Peking University, Beijing 100871, China
  • 4Beijing Academy of Quantum Information Sciences, Beijing 100193, China

  • *Yunquan.liu@pku.edu.cn
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Phys. Rev. A 102, 061101(R) – Published 3 December, 2020

DOI: https://doi.org/10.1103/PhysRevA.102.061101

Abstract

When a bound electron is photoionized from an atom or molecule, the remaining multielectron ion with excess internal energy will relax towards lower-energy states. The subsequent transverse angular momentum transfer between the parent ion and the ejected electron can lead to an electron parity-unfavored transition. Here we perform a self-calibrated timing experiment to measure the time delay of the angular momentum transfer of parity-unfavored transitions during the multiphoton ionization. We use a strong linearly polarized 400-nm light field to trigger a parity-unfavored transition in the channel of the spin-orbit excited ionic state of krypton atoms and then selectively probe the phases of the electron wave functions with different magnetic quantum numbers with a weak parallelly (orthogonally) polarized 800-nm light field. The parallel and orthogonal probes serve as the start and the stop of a stopwatch, respectively. Hence, this allows us to access the characteristic time of such an ultrafast intra-atom multielectron process.

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Phys. Rev. A 102, 061101(R)– Published 3 December, 2020
  • Received 24 June 2020
  • Revised 8 November 2020
  • Accepted 13 November 2020
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