Tomographic reconstruction of designer free-electron wave packets

Area of Science:

• Quantum mechanics
• Atomic and molecular physics
• Laser physics

Background:

• Electron wave packets are fundamental to understanding quantum phenomena.
• Tailoring electron momentum distributions offers new avenues in spectroscopy.
• Multiphoton ionization provides a pathway to generate specific electron states.

Purpose of the Study:

• To review the generation of designer electron wave packets with controlled momentum.
• To describe the tomographic reconstruction of these wave packets.
• To explore applications in molecular frame characterization and chemical analysis.

Main Methods:

• Generation via multiphoton ionization using polarization-shaped femtosecond laser pulses.
• Measurement of three-dimensional photoelectron angular distributions (3dPAD) using velocity map imaging (VMI).
• Tomographic reconstruction applied to VMI data for detailed wave packet characterization.

Main Results:

• Demonstration of generating electron wave packets with tailored momentum distributions.
• Successful tomographic reconstruction of the wave packet's three-dimensional momentum profile.
• Characterization of 3dPAD in both laboratory and molecular frames.

Conclusions:

• The described method enables precise control and characterization of electron wave packets.
• This technique advances the study of electronic structure and molecular dynamics.
• Potential for development into highly sensitive analytical techniques, including chiral molecule identification.