研究目的
Investigating the photoelectron-nuclear energy sharing mechanism in the dissociative ionization of H2 with respect to laser intensity and wavelength.
研究成果
The study reveals that the photoelectron-nuclear energy sharing in the dissociative ionization of H2 critically depends on the laser parameters. At λ = 395 nm, the energy sharing changes from a back-diagonal to a nondiagonal structure with increasing laser intensity. At λ = 790 nm, bond hardening plays a significant role, leading to a nondiagonal horizontal JES structure without evident energy sharing. The findings provide a comprehensive understanding of the correlated photoelectron-nuclear dynamics in strong-field molecular dissociation.
研究不足
The study is limited to the simplest diatomic molecule H2 and specific laser wavelengths (395 nm and 790 nm). The theoretical model cannot reproduce the relative yield enhancement of photoelectrons near zero momentum of the single ionization compared with the dissociative ionization channel.
1：Experimental Design and Method Selection:
The study uses linearly polarized 25-fs laser pulses at λ = 790 nm and λ = 395 nm to investigate the dissociative ionization of H2. The photoelectrons and dissociative ions are coincidently measured with the Cold Target Recoil Ion Momentum Spectroscopy (COLTRIMS).
2：The photoelectrons and dissociative ions are coincidently measured with the Cold Target Recoil Ion Momentum Spectroscopy (COLTRIMS).
Sample Selection and Data Sources:
2. Sample Selection and Data Sources: The simplest diatomic molecule H2 is used as the sample.
3：List of Experimental Equipment and Materials:
Commercial Ti: Sapphire laser for generating 790 nm pulses, barium borate crystal for second harmonic generation to produce 395 nm pulses, and COLTRIMS for measurement.
4：Experimental Procedures and Operational Workflow:
The momenta of the neutral hydrogen atoms are reconstructed according to the momentum conservation law. The joint energy spectra (JES) of photoelectrons and kinetic energy release of nuclei are analyzed.
5：Data Analysis Methods:
A quantum mechanical model including the correlation between the photoelectron and the molecular ion is developed to analyze the data.
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