氦纳米液滴中共振原子间库仑衰变的时分辨研究
原子与分子团簇
2021-04-15 v1
摘要
当弱束缚复合物被强电磁辐射多重激发时，能量可通过一种共振原子间库仑衰变（ICD）在相邻原子间交换。这种由多重激发引起的衰变机制被预测为相对缓慢，通常持续数十至数百皮秒。在此，我们利用高分辨率、可调谐的极紫外自由电子激光直接测量了共振激发氦液滴中的 ICD 时间尺度。在广泛的液滴尺寸和激光强度范围内，我们发现该衰变出奇地快，衰变时间快至 400 飞秒，并且仅对激发态密度表现出弱依赖。结合含时密度泛函理论和 ab initio 量子化学计算，我们阐明了这一超快衰变过程的机制：液滴中成对激发的氦原子强烈相互吸引并形成合并的空穴气泡，从而极大地加速了 ICD。
引用
@article{arxiv.2009.01758,
title = {Time-resolved study of resonant interatomic Coulombic decay in helium nanodroplets},
author = {A. C. LaForge and R. Michiels and Y. Ovcharenko and A. Ngai and J. M. Escartin and N. Berrah and C. Callegari and A. Clark and M. Coreno and R. Cucini and M. Di Fraia and M. Drabbels and E. Fasshauer and P. Finetti and L. Giannessi and C. Grazioli and D. Iablonskyi and B. Langbehn and T. Nishiyama and V. Oliver and P. Piseri and O. Plekan and K. C. Prince and D. Rupp and S. Stranges and K. Ueda and N. Sisourat and J. Eloranta and M. Pi and M. Barranco and F. Stienkemeier and T. Moeller and M. Mudrich},
journal= {arXiv preprint arXiv:2009.01758},
year = {2021}
}