大尺寸纯氦纳米液滴中光电子碰撞激发诱导的高效间接原子间库仑衰变

Efficient Indirect Interatomic Coulombic Decay Induced by Photoelectron Impact Excitation in Large Pure Helium Nanodroplets.

作者信息

Ben Ltaief L, Sishodia K, Mandal S, De S, Krishnan S R, Medina C, Pal N, Richter R, Fennel T, Mudrich M

机构信息

Department of Physics and Astronomy, Aarhus University, 8000 Aarhus C, Denmark.

Quantum Center of Excellence for Diamond and Emergent Materials and Department of Physics, Indian Institute of Technology Madras, Chennai 600036, India.

出版信息

Phys Rev Lett. 2023 Jul 14;131(2):023001. doi: 10.1103/PhysRevLett.131.023001.

DOI:10.1103/PhysRevLett.131.023001

PMID:37505945

Abstract

Ionization of matter by energetic radiation generally causes complex secondary reactions that are hard to decipher. Using large helium nanodroplets irradiated by extreme ultraviolet (XUV) photons, we show that the full chain of processes ensuing primary photoionization can be tracked in detail by means of high-resolution electron spectroscopy. We find that elastic and inelastic scattering of photoelectrons efficiently induces interatomic Coulombic decay (ICD) in the droplets. This type of indirect ICD even becomes the dominant process of electron emission in nearly the entire XUV range in large droplets with radius ≳40 nm. Indirect ICD processes induced by electron scattering likely play an important role in other condensed-phase systems exposed to ionizing radiation as well, including biological matter.

摘要

高能辐射使物质发生电离，通常会引发难以解析的复杂次级反应。我们利用被极紫外（XUV）光子辐照的大型氦纳米液滴，表明通过高分辨率电子能谱可以详细追踪初级光电离之后的完整过程链。我们发现光电子的弹性和非弹性散射能有效地在液滴中诱发原子间库仑衰变（ICD）。在半径≳40 nm的大型液滴中，这种间接ICD甚至在几乎整个XUV范围内都成为电子发射的主导过程。由电子散射诱发的间接ICD过程可能在其他暴露于电离辐射的凝聚相系统（包括生物物质）中也发挥着重要作用。