研究目的
Investigating the universality of photoelectron circular dichroism (PECD) in the photoionization of chiral molecules across different ionization regimes.
研究成果
The study concludes that PECD is a universal effect in the photoionization of chiral molecules, observable across all ionization regimes. It provides complementary spectroscopic information at electronic and vibrational levels and can be understood through a classical picture of electron scattering on the chiral potential under the influence of a circularly polarized electric field.
研究不足
The study's limitations include the sensitivity of PECD to the electronic character and strength of intermediate resonances in UV-MPI of limonene, and the influence of laser intensity on the PECD response in fenchone.
1：Experimental Design and Method Selection:
The study involved photoionization of chiral molecules using circularly polarized radiation across different ionization regimes (single photon, multiphoton, above-threshold, and tunnel ionization).
2：Sample Selection and Data Sources:
Chiral molecules (+)-limonene and (+)-fenchone were used as samples. The experiments were conducted using the Aurore laser at CELIA, which provides 7 mJ-25 fs pulses at 800 nm with a 1 kHz repetition rate.
3：List of Experimental Equipment and Materials:
A velocity map imaging spectrometer, an optical parametric amplifier (HE-TOPAS), and a 200 μm thick type I BBO crystal were used.
4：Experimental Procedures and Operational Workflow:
The laser pulses were focused into a velocity map imaging spectrometer where the chiral molecules were introduced as a continuous flow. The PECD was measured by recording the photoelectron spectra with left and right circular polarizations.
5：Data Analysis Methods:
The photoelectron angular distributions (PADs) were decomposed as a sum of Legendre polynomials to analyze the PECD.
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