New stable multiply charged negative atomic ions in linearly polarized superintense laser fields.
New stable multiply charged negative atomic ions in linearly polarized superintense laser fields.
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DOI：
10.1063/1.2207619
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发表时间：
2006-05
期刊：
影响因子：
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通讯作者：
Qi Wei;S. Kais;N. Moiseyev
中科院分区：
文献类型：
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作者：
Qi Wei;S. Kais;N. Moiseyev
带单电荷的负原子离子存在于气相中，在原子和分子物理学中具有根本的重要性。然而，理论计算和实验结果明确排除了气相中任何稳定的带双负电荷的原子离子的存在，气相中的一个自由原子上只能加一个电子。本文用高频Floquet理论预言，在线性超强激光场中，可以稳定气相中的多电荷负原子离子。我们提出了自洽场计算的线性超强激光场需要绑定额外的一个和两个电子，形成He-，He 2-，和Li 2-，分离能量依赖于激光强度和最大值分别为1.2，0.12，和0.13 eV。束缚额外电子所需的磁场和频率在实验范围内。这种稳定化方法具有普遍性，可用于预测较大的多电荷负原子离子的稳定性。
Singly charged negative atomic ions exist in the gas phase and are of fundamental importance in atomic and molecular physics. However, theoretical calculations and experimental results clearly exclude the existence of any stable doubly-negatively-charged atomic ion in the gas phase, only one electron can be added to a free atom in the gas phase. In this report, using the high-frequency Floquet theory, we predict that in a linear superintense laser field one can stabilize multiply charged negative atomic ions in the gas phase. We present self-consistent field calculations for the linear superintense laser fields needed to bind extra one and two electrons to form He-, He2-, and Li2-, with detachment energies dependent on the laser intensity and maximal values of 1.2, 0.12, and 0.13 eV, respectively. The fields and frequencies needed for binding extra electrons are within experimental reach. This method of stabilization is general and can be used to predict stability of larger multiply charged negative atomic ions.