研究目的
Investigating the photoemission time delays between electrons originating from the valence shells of neon and argon using attosecond streaking.
研究成果
The study reveals a delay of a few tens of attoseconds in the emission of electrons ionized from argon with respect to those liberated from neon, in a photon energy range between 28 and 40 eV. The analysis shows that the attochirp of the XUV pump pulse must be properly accounted for to obtain reliable energy-dependent time delays.
研究不足
The temporal structure of the ionizing single attosecond pulse may significantly affect the obtained time delays, requiring a procedure to properly account for this contribution.
1：Experimental Design and Method Selection:
The study employs attosecond streaking technique to measure photoemission time delays. The methodology involves using single attosecond pulses (SAP) to ionize the target and a synchronized infrared (IR) probe pulse to provide timing information.
2：Sample Selection and Data Sources:
A gas target containing a mixture of argon and neon is used, ensuring identical experimental conditions for both noble gases.
3：List of Experimental Equipment and Materials:
The setup includes a reaction microscope for coincidence detection, SAPs generated by focusing 800-nm IR laser pulses into an argon gas target, and a toroidal mirror for focusing the XUV-pump and IR-probe beams.
4：Experimental Procedures and Operational Workflow:
The SAP and IR probe pulses are focused into a supersonic gas target inside the reaction microscope. The final momentum of the photoelectrons is recorded for different pump-probe time delays.
5：Data Analysis Methods:
The FROG-CRAB retrieval algorithm is used to analyze the spectrograms and extract the spectral phase and group delays.
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