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arXiv physics/0303080physics.atm-clusphysics.chem-ph
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强laser场中水分子团簇的爆炸

Explosions of water clusters in intense laser fields

V. Kumarappan, M. Krishnamurthy, D. Mathur

备注：
Submitted to Phys. Rev. A
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摘要：

高能、高电荷氧离子$O^{q+}$（$q\leq 6$）在高电荷水簇$(H_2O)_n$和$(D_2O)_n$ $n\sim$ 60的激光场诱导分解时大量产生，所述高电荷水簇通过用水蒸气播种高压氦或氩形成。发现在相似的实验条件下形成的$Ar_n$团簇（n $\sim$ 40000）在库仑爆炸区发生解体，$Ar^{q+}$离子的能量与$q^2$有关。水团簇，这被认为是相当小的尺寸，也应该在同一制度下解体，但碎片O $^{q+}$离子的能量被发现线性依赖于$q$，根据流行的智慧，应该是一个签名的流体动力学膨胀，预计大得多的集群。这些意见对我们理解的两个集群爆炸制度，库仑爆炸和流体动力学膨胀的影响，进行了讨论。我们的研究结果表明，离子能量的电荷态依赖性不构成一个明确的实验签名的集群爆炸制度。

英文摘要：

Energetic, highly-charged oxygen ions, $O^{q+}$ ($q\leq 6$), are copiously produced upon laser field-induced disassembly of highly-charged water clusters, $(H_2O)_n$ and $(D_2O)_n$, $n\sim$ 60, that are formed by seeding high-pressure helium or argon with water vapor. $Ar_n$ clusters (n$\sim$40000) formed under similar experimental conditions are found undergo disassembly in the Coulomb explosion regime, with the energies of $Ar^{q+}$ ions showing a $q^2$ dependence. Water clusters, which are argued to be considerably smaller in size, should also disassemble in the same regime, but the energies of fragment O$^{q+}$ ions are found to depend linearly on $q$ which, according to prevailing wisdom, ought to be a signature of hydrodynamic expansion that is expected of much larger clusters. The implication of these observations on our understanding of the two cluster explosion regimes, Coulomb explosion and hydrodynamic expansion, is discussed. Our results indicate that charge state dependences of ion energy do not constitute an unambiguous experimental signature of cluster explosion regime.

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