Frustrated Coulomb explosion of small helium clusters
Frustrated Coulomb explosion of small helium clusters
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DOI：
10.1103/physreva.98.050701
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发表时间：
2018-06
影响因子：
2.9
通讯作者：
S. Kazandjian;J. Rist;M. Weller;F. Wiegandt;D. Asliturk;S. Grundmann;M. Kircher;G. Nalin;D. Pitters;I. P'erez;M. Waitz;G. Schiwietz;B. Griffin;J. Williams;R. Dorner;M. Schoffler;T. Miteva;F. Trinter;T. Jahnke;N. Sisourat
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作者：
S. Kazandjian;J. Rist;M. Weller;F. Wiegandt;D. Asliturk;S. Grundmann;M. Kircher;G. Nalin;D. Pitters;I. P'erez;M. Waitz;G. Schiwietz;B. Griffin;J. Williams;R. Dorner;M. Schoffler;T. Miteva;F. Trinter;T. Jahnke;N. Sisourat
大约十年前，高能中性氢原子在H$_2$的强场双电离后被探测到。这个过程被称为“受抑隧穿电离”，发生在电离电子被飞秒激光的电场驱回其母离子后被重新捕获时。在本研究中，我们证明了一个相关的过程自然发生在集群中，而不需要一个外部的字段：我们观察到的电荷跳跃，发生在库仑爆炸的一个小的氦集群，这导致一个充满活力的中性氦原子。这一主张得到了理论证据的支持。作为“受抑隧道电离”的一个类比，我们称这个过程为“受抑库仑爆炸”。
Almost ten years ago, energetic neutral hydrogen atoms were detected after a strong-field double ionization of H$_2$. This process, called 'frustrated tunneling ionization', occurs when an ionized electron is recaptured after being driven back to its parent ion by the electric field of a femtosecond laser. In the present study we demonstrate that a related process naturally occurs in clusters without the need of an external field: we observe a charge hopping that occurs during a Coulomb explosion of a small helium cluster, which leads to an energetic neutral helium atom. This claim is supported by theoretical evidence. As an analog to 'frustrated tunneling ionization', we term this process 'frustrated Coulomb explosion'.