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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Coulomb explosion phenomenon using gigawatt intensity laser fields: an exotic realm of laser-cluster interaction
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Coulomb explosion phenomenon using gigawatt intensity laser fields: an exotic realm of laser-cluster interaction

机译：使用千兆瓦强度激光场的库仑爆炸现象：激光与分子相互作用的异域

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摘要

Flanked between isolated atoms/molecules and bulk materials at the two extremes, there exists a unique class of matter known as clusters, which consist of a few to thousands of atoms or molecules held together. Upon irradiation with lasers, these clusters exhibit diverse photochemical behaviours which are altogether different from those of their individual constituents. Coulomb explosion phenomenon is one such facet of laser-cluster photochemistry, which results in the generation of multiply chargedatomic ions and electrons with large kinetic energy. Observation of Coulomb explosion at laser intensities of 1014 W/cm2 and higher, achieved using femtosecond lasers is reasonably well understood. Such cluster-explosion studies have obvious implicationsfor the development of tabletop accelerators. In contrast to the high-intensity studies, the present article summarizes various experiments carried out using nanosecond laser pulses with intensities as small as 109 W/cm2 in our laboratory, that establish the occurrence of Coulomb explosion in molecular clusters. Our present finding regarding utilization of low-cost, rugged and easy to use solid-state nanosecond Nd: YAG laser at comparatively lower laser intensity, for generation of multiply charged atomic ions would provide impetus to laser-cluster interaction studies.
机译：在两个极端之间位于孤立的原子/分子和散装材料之间，存在着一类独特的物质，称为簇，它由几千个原子或分子结合在一起组成。在用激光照射时，这些簇表现出各种光化学行为，这些行为与它们各自成分的完全不同。库仑爆炸现象就是激光团簇光化学的一个方面，它导致产生具有大动能的多重带电原子离子和电子。使用飞秒激光在1014 W / cm2和更高的激光强度下观察库仑爆炸是相当容易理解的。这样的集群爆炸研究对于桌面加速器的发展具有明显的意义。与高强度研究相反，本文总结了在我们的实验室中使用强度低至109 W / cm2的纳秒激光脉冲进行的各种实验，这些实验确定了分子簇中发生库仑爆炸的情况。我们目前关于利用低成本，坚固耐用且易于使用的固态纳秒Nd：YAG激光（相对较低的激光强度）的发现，可产生多电荷原子离子，这将为激光-分子相互作用研究提供动力。

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