Beauvarlet Sandra, Bloch Etienne, Rajak Debobrata, Descamps Dominique, Fabre Baptiste, Petit Stéphane, Pons Bernard, Mairesse Yann, Blanchet Valérie
Université de Bordeaux - CNRS - CEA, CELIA, UMR 5107, F33405 Talence, France.
Phys Chem Chem Phys. 2022 Mar 16;24(11):6415-6427. doi: 10.1039/d1cp05618b.
The resonance-enhanced multiphoton ionization of chiral molecules by elliptically polarized laser pulses produces photoelectron angular distributions that are forward/backward asymmetric with respect to the light propagation axis. We investigate this photoelectron elliptical dichroism in the (2 + 1)-photon ionization of fenchone molecules, using wavelength tunable femtosecond UV pulses. We show that the photoelectron elliptical asymmetry is extremely sensitive to the intermediate resonant states involved in the ionization process, and enables electronic couplings to be revealed that do not show up so clearly when using circularly polarized light.
椭圆偏振激光脉冲对手性分子的共振增强多光子电离产生相对于光传播轴呈前向/后向不对称的光电子角分布。我们使用波长可调谐飞秒紫外脉冲研究了葑酮分子（2 + 1）-光子电离中的这种光电子椭圆二色性。我们表明，光电子椭圆不对称性对电离过程中涉及的中间共振态极其敏感，并且能够揭示在使用圆偏振光时不太明显的电子耦合。
