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Chinese Physics Letters

Creation of an Ultracold Plasma by Photoionizing Laser-Cooled Caesium Atom

景群, 冯志刚, 张临杰, 李昌勇, Jianming Zhao, 贾锁堂

Published Jan 1, 2008• 0 citations
OpenAlex

Abstract

极端冷血浆的信号被凉下来激光的原子的二光子的电离在一台 caesium 磁电机观察光陷井。一个简单模型被介绍了解释血浆的创造，并且机制被改变搏动的染料激光的精力和起始的凉下来的原子的数字进一步调查。

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We report the creation of an ultracold neutral plasma by photoionization of laser-cooled xenon atoms. The charge carrier density is as high as $2\ifmmode\times\else\texttimes\fi{}{10}^{9}{\mathrm{cm}}^{\ensuremath{-}3}$, and the temperatures of electrons and ions are as low as 100 mK and $10\ensuremath{\mu}\mathrm{K}$, respectively. Plasma behavior is evident in the trapping of electrons by the positive ion cloud when the Debye screening length becomes smaller than the size of the sample. We produce plasmas with parameters such that both electrons and ions are strongly coupled.
We present the first large-scale simulations of an ultracold neutral plasma, produced by photoionization of laser-cooled xenon atoms, from creation to initial expansion, using classical molecular-dynamics methods with open boundary conditions. We reproduce many of the experimental findings such as the trapping efficiency of electrons with increased ion number, a minimum electron temperature achieved on approach to the photoionization threshold, and recombination into Rydberg states of an anomalously low principal quantum number. In addition, many of these effects establish themselves very early in the plasma evolution ( similar ns) before the present experimental observations begin.