Charge transfer and penning ionization of dopants in or on helium nanodroplets exposed to EUV radiation.
Charge transfer and penning ionization of dopants in or on helium nanodroplets exposed to EUV radiation.
复制标题
暴露于 EUV 辐射的氦纳米液滴内或之上的掺杂剂的电荷转移和潘宁电离。
DOI：
10.1021/jp401424w
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
M. Mudrich
中科院分区：
文献类型：
--
作者：
D. Buchta;S. Krishnan;N. Brauer;M. Drabbels;P. O’Keeffe;M. Devetta;M. Di Fraia;C. Callegari;R. Richter;M. Coreno;K. Prince;F. Stienkemeier;R. Moshammer;M. Mudrich
氦纳米液滴被广泛用作冷的、弱相互作用的基质，用于嵌入物种的光谱分析。在这项工作中，我们使用同步辐射来激发或电离掺杂的He液滴，并研究它们对掺杂原子的影响，这取决于它们在液滴内部(稀有气体)或液滴表面外部(碱金属)的位置。利用可变光子能量(20-25 eV)下的光电子-光离子符合成像光谱，我们比较了两种情况下掺杂的电荷转移速率和潘宁电离速率。令人惊讶的发现是，与稀有气体相反，碱金属在宿主液滴的(n=2)-带的激发下被有效地潘宁电离。这表明激发迅速迁移到液滴表面，随后松弛，最终能量转移到碱掺杂。
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.
影响因子：
3.3
作者：
Fechner, L.;Gruener, B.;Mudrich, M.
通讯作者：
Mudrich, M.