近日，华东师范大学张文斌团队研究了氦纳米液滴中H₂分子的激光诱导库仑爆炸动力学。相关论文于2025年12月23日发表在《物理评论A》杂志上。

研究组分析了在强紫外飞秒激光脉冲诱导下嵌入氦纳米液滴中的H₂分子的库仑爆炸动力学。通过离子-离子重合和动量相关光谱，研究组确定了液滴内H₂分子的库仑爆炸双电离。结果表明，离解H⁺离子与周围He原子的碰撞显著改变了离子碎片的动能分布和发射方向。

值得注意的是，He来自库仑爆炸通道的H⁺碎片在较大的液滴中表现出更高的动能，这一现象是由依赖于碎片动能和液滴尺寸的溶剂化动力学驱动的。这项研究为量子液体中轻杂质的平移、解离和溶剂化过程提供了深入的见解，强调了在这些过程中液滴大小在形成碎片动力学中的关键作用。

附：英文原文

Title: Laser-induced Coulomb explosion dynamics of H2 molecules in helium nanodroplets

Author: Zhengjun Ye, Jiaxuan Chen, Ruolin Gong, Menghang Shi, Zhejun Jiang, Chenxu Lu, Yue Hu, Xinglei Long, Wenbin Zhang, Jian Wu

Issue&Volume: 2025/12/23

Abstract: We investigate the Coulomb explosion dynamics of H2 molecules embedded in helium nanodroplets, induced by an intense ultraviolet femtosecond laser pulse. By employing ion-ion coincidence and momentum correlation spectroscopy, we identify the Coulomb-exploded double ionization of H2 molecules within the droplets. Our results demonstrate that the collisions between dissociating H+ ions and surrounding He atoms significantly alter both the kinetic energy distributions and the emission direction of the ion fragments. Notably, the HeH+ fragments originating from the Coulomb explosion channel exhibit higher kinetic energies in larger droplets, a phenomenon driven by the solvation dynamics that depend on the fragment's kinetic energy and droplet size. This study provides deep insights into the translation, dissociation, and solvation processes of light impurities in quantum liquid, underscoring the critical role of droplet size in shaping fragment kinetics during these processes.

DOI: 10.1103/7f9s-1d4t

Source: https://journals.aps.org/pra/abstract/10.1103/7f9s-1d4t