Determination of the Ionization Time Using Attosecond Photoelectron Interferometry.

Area of Science:

• Quantum physics
• Atomic and molecular physics
• Strong-field physics

Background:

• Laser-induced electron tunneling ionization is fundamental to strong-field phenomena.
• Accurate measurement of ionization time is critical for attosecond metrology.
• Current methods lack precision in determining ionization temporal characteristics.

Purpose of the Study:

• To propose and validate a novel attosecond interferometer for precise ionization time determination.
• To resolve both real and imaginary parts of ionization time.
• To enhance accuracy in attosecond metrology.

Main Methods:

• Utilizing an attosecond photoelectron interferometer based on interfering electron wave packets.
• Introducing a weak orthogonal perturbation to the fundamental laser field.
• Analyzing shifts in photoelectron momentum distribution interferograms.

Main Results:

• Precise retrieval of the real part of ionization time (electron exit time).
• Accurate determination of electron rescattering time.
• Unambiguous measurement of the imaginary part of ionization time, related to sub-barrier motion.

Conclusions:

• The proposed interferometer offers unprecedented accuracy in measuring ionization dynamics.
• This method provides a new pathway for advancing attosecond science and metrology.
• The ability to determine both real and imaginary parts of ionization time offers deeper insights into electron behavior.