大超流氦滴中苯胺多光子电离的抑制
Suppression of Multiphoton Ionization of Aniline in Large Superfluid Helium Droplets.
作者信息
Alghamdi Maha, Zhang Jie, Bradford Stephen D, Kong Wei
机构信息
Department of Chemistry, Oregon State University, Corvallis, OR 97331-4003.
出版信息
Chem Phys Lett. 2019 Nov 16;735. doi: 10.1016/j.cplett.2019.136752. Epub 2019 Sep 9.
Abstract
We report suppression of multiphoton ionization (MPI) of aniline doped large superfluid helium droplets containing over 5 × 10 atoms. In contrast, surface-bound sodium atoms and dimers are readily desorbed and ionized. Adequacy of the experimental conditions is also confirmed from ejection of embedded aniline cations from smaller droplets containing multiple cations, and MPI of gaseous aniline. The photoelectrons have a mean-free-path of less than 1 nm and a thermalization distance of 10 nm. In a droplet with a diameter of over 70 nm, effective charge recombination within the droplet is expected.
摘要
我们报道了对含有超过5×10个原子的苯胺掺杂大超流氦滴的多光子电离（MPI）的抑制。相比之下，表面结合的钠原子和二聚体很容易解吸并被电离。从含有多个阳离子的较小液滴中喷射出嵌入的苯胺阳离子以及气态苯胺的MPI，也证实了实验条件的充分性。光电子的平均自由程小于1纳米，热化距离为10纳米。在直径超过70纳米的液滴中，预计液滴内会发生有效的电荷复合。
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