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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Coherent control of population transfer in rydberg atoms via chirped microwave pulses
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Coherent control of population transfer in rydberg atoms via chirped microwave pulses

机译：通过chi微波脉冲相干控制雷德伯格原子中的迁移

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摘要

We present a comprehensive and ab initio nonperturbative investigation of the coherent population transfer among the 3D high-lying Rydberg hydrogen and alkali atomic states via linearly polarized chirped microwave pulses. The time-dependent Schrodinger equation for the dynamical evolution of Rydberg atoms is accurately and efficiently solved by means of the time-dependent generalized pseudospectral method. For atomic H, the population transfer from n = 35 to 30 with nearly 100% efficiency is achieved by means of the sequential two-photon Delta n = -1 transitions. The calculation fully utilizes all of the available orbital angular momentum l states for a given n, and the interference pattern and population evolution dynamics of individual l states are analyzed in detail. It is shown that the coherent control of the population transfer from the high n to the low n states can be accomplished by the optimization of the chirping parameters and microwave field strength. Similar analysis is performed for the Na atom, where the alkali atomic structure is described by an accurate model potential. We found that while the global population transfer pattern is qualitatively similar, there are significant differences in the dynamical response of atomic H and Na to the chirped microwave fields. Due to the degeneracy of the l states (for a given n) in unperturbed atomic H, the population transfer involves significant coupling and interference among a number of low-lying I states. For the case of Na atoms, however, the population transfer from the n to (n - 1) state is dominated by a single channel, namely, from the vertical bar n,l = 0 to the vertical bar n - 1,l = 0 state.
机译：我们通过线性极化的microwave微波脉冲，对3D高层Rydberg氢原子态和碱原子态之间的相干种群转移进行了全面，从头开始的无扰动研究。借助时变广义伪谱方法，可以准确有效地求解Rydberg原子动力学演化的时变Schrodinger方程。对于原子H，通过连续的两个光子Delta n = -1跃迁实现了从n = 35到近30％效率的总体转移。该计算充分利用了给定n的所有可用轨道角动量l状态，并详细分析了各个l状态的干扰模式和总体演化动力学。结果表明，可以通过优化the参数和微波场强度来实现从高n态到低n态的总体迁移的相干控制。对Na原子进行了类似的分析，其中碱原子的结构由精确的模型电势描述。我们发现，尽管全球人口转移模式在质量上相似，但是原子H和Na对the微波场的动力响应存在显着差异。由于在不受干扰的原子H中l状态（对于给定的n）的简并性，人口迁移涉及许多低洼I状态之间的显着耦合和干扰。但是，对于Na原子，从n态到（n-1）态的总体转移受单个通道控制，即从垂直线n，l = 0到垂直线n -1，l = 0状态。

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