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Attosecond Molecular Angular Streaking with All-Ionic Fragments Detection.

Wei Quan1,2, Vladislav V Serov3, MingZheng Wei1

  • 1State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430071, China.

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Summary
This summary is machine-generated.

This study introduces a new attosecond angular streaking method for molecules, using ionic fragments to measure electron dynamics and revealing a tunneling time under 10 attoseconds in H2.

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Area of Science:

  • Quantum dynamics
  • Strong-field physics
  • Molecular spectroscopy

Background:

  • Attosecond angular streaking (attoclock) probes ultrafast electron dynamics.
  • Current attoclock methods are limited to atomic targets and photoelectron measurements.

Purpose of the Study:

  • To develop a novel attosecond angular streaking scheme for molecular targets.
  • To measure electron tunneling times in molecules using ionic fragments.

Main Methods:

  • Proposed a new attosecond angular streaking scheme using ionic fragments from dissociative ionization.
  • Detected ionic fragments in the polarization plane of circularly polarized laser light.
  • Performed measurements on the H2 molecule.

Main Results:

  • Ionic attoclock measurements were consistent with time-dependent Schrödinger equation calculations.
  • An upper bound of 10 attoseconds was determined for the tunneling time in H2.
  • This tunneling time is significantly shorter than previously reported values.

Conclusions:

  • The novel ionic attoclock technique is applicable to molecular systems.
  • The study provides new insights into ultrafast electron dynamics and tunneling times in molecules.