研究目的
To provide an unambiguous experimental proof that two-center interference survives strong-field ionization in neon dimers, and to observe both gerade and ungerade interference patterns by post-selecting dissociation channels.
研究成果
The study unambiguously demonstrates that two-center photoelectron interference persists in strong-field ionization of neon dimers, with observable fringe patterns in the molecular frame. Post-selection of dissociation channels allows switching between gerade and ungerade interference types. This provides a method for measuring bond lengths and probing molecular orbital phases, with implications for understanding quantum mechanics and applications in strong-field physics.
研究不足
The finite contrast in interference fringes may be due to electron interaction with neighboring atoms. Discrepancies in bond length estimation between potential mapping and interference methods suggest inaccuracies from laser-induced changes in potential energy curves. The approach is limited to gas-phase samples and specific molecular systems like neon dimers.
1：Experimental Design and Method Selection:
The experiment used cold target recoil ion momentum spectroscopy (COLTRIMS) to measure 3D momenta of ions and electrons after ionization of neon dimers by a strong laser field. The theoretical model involved solving the time-dependent Schr?dinger equation (TDSE) in the single-active-electron approximation and coherently superimposing atomic photoelectron momentum distributions to simulate interference patterns.
2：Sample Selection and Data Sources:
Neon dimers were prepared in a molecular beam via supersonic expansion of gaseous neon at 60 K through a 5 μm nozzle, with a back pressure of 3 bar to optimize dimer yield. Dimers were selected using matter wave diffraction with a transmission grating.
3：List of Experimental Equipment and Materials:
A 40 fs, 780 nm laser (Dragon, KMLabs), COLTRIMS spectrometer with electric and magnetic fields, micro-channel plate detector with delay-line position readout, cryogenic cryostat (Model RC110 UHV, Cryo Industries of America, Inc.), and transmission grating.
4：Experimental Procedures and Operational Workflow:
Neon dimers were ionized by the laser at intensities of 7.3×10^14 W cm^-2 (circular polarization) or 1.2×10^15 W cm^-2 (linear polarization). Charged products were detected in coincidence using COLTRIMS. Ion and electron momenta were measured, and events were post-selected based on kinetic energy release (KER) to distinguish direct and indirect dissociation pathways.
5：3×10^14 W cm^-2 (circular polarization) or 2×10^15 W cm^-2 (linear polarization). Charged products were detected in coincidence using COLTRIMS. Ion and electron momenta were measured, and events were post-selected based on kinetic energy release (KER) to distinguish direct and indirect dissociation pathways.
Data Analysis Methods:
5. Data Analysis Methods: Photoelectron momentum distributions were generated in the molecular frame by projecting ion and electron momenta. Data were normalized to monomer spectra to remove ionization weighting. Interference patterns were analyzed using classical simulations and eq. 1 for fringe spacing.
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