EUV激发后掺杂氦纳米液滴的彭宁电离
Penning ionization of doped helium nanodroplets following EUV excitation
摘要：
氦纳米液滴作为一种冷的、弱相互作用的基质被广泛用于包埋物质的光谱学研究。在这项工作中，我们使用同步辐射激发或激发掺杂的He液滴，并研究其对掺杂剂原子的影响，这取决于它们在液滴内部（稀有气体）或液滴表面（碱金属）外部的位置。使用光电子-光离子符合成像光谱在可变的光子能量（20-25 eV），我们比较了电荷转移率的潘宁电离的掺杂剂在两种情况下。令人惊讶的发现是，碱金属，与稀有气体相反，有效地潘宁电离后的（n=2）带的主机液滴的激发。这表明激发快速迁移到液滴表面，随后弛豫，并最终能量转移到碱性掺杂剂。
英文摘要：
Helium nanodroplets are widely used as a cold, weakly interacting matrix for spectroscopy of embedded species. In this work we excite or ionize doped He droplets using synchrotron radiation and study the effect onto the dopant atoms depending on their location inside the droplets (rare gases) or outside at the droplet surface (alkali metals). Using photoelectron-photoion coincidence imaging spectroscopy at variable photon energies (20-25 eV), we compare the rates of charge-transfer to Penning ionization of the dopants in the two cases. The surprising finding is that alkali metals, in contrast to the rare gases, are efficiently Penning ionized upon excitation of the (n=2)-bands of the host droplets. This indicates rapid migration of the excitation to the droplet surface, followed by relaxation, and eventually energy transfer to the alkali dopants.
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