dorsal/arxiv
View SchemaExplosions of water clusters in intense laser fields
| Authors | V. Kumarappan, M. Krishnamurthy, D. Mathur |
|---|---|
| Categories | |
| ArXiv ID | physics/0303080 |
| URL | https://arxiv.org/abs/physics/0303080 |
| DOI | 10.1103/PhysRevA.67.063207 |
Abstract
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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"abstract": "Energetic, highly-charged oxygen ions, $O^{q+}$ ($q\\leq 6$), are copiously\nproduced upon laser field-induced disassembly of highly-charged water clusters,\n$(H_2O)_n$ and $(D_2O)_n$, $n\\sim$ 60, that are formed by seeding high-pressure\nhelium or argon with water vapor. $Ar_n$ clusters (n$\\sim$40000) formed under\nsimilar experimental conditions are found undergo disassembly in the Coulomb\nexplosion regime, with the energies of $Ar^{q+}$ ions showing a $q^2$\ndependence. Water clusters, which are argued to be considerably smaller in\nsize, should also disassemble in the same regime, but the energies of fragment\nO$^{q+}$ ions are found to depend linearly on $q$ which, according to\nprevailing wisdom, ought to be a signature of hydrodynamic expansion that is\nexpected of much larger clusters. The implication of these observations on our\nunderstanding of the two cluster explosion regimes, Coulomb explosion and\nhydrodynamic expansion, is discussed. Our results indicate that charge state\ndependences of ion energy do not constitute an unambiguous experimental\nsignature of cluster explosion regime.",
"arxiv_id": "physics/0303080",
"authors": [
"V. Kumarappan",
"M. Krishnamurthy",
"D. Mathur"
],
"categories": [
"physics.atm-clus",
"physics.chem-ph"
],
"doi": "10.1103/PhysRevA.67.063207",
"title": "Explosions of water clusters in intense laser fields",
"url": "https://arxiv.org/abs/physics/0303080"
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