The problem of probe-field spectrum is considered for a three-level ion placed in a field of an intense standing light wave. The ion interaction with plasma and the velocity-changing Coulomb scattering are taken into account within the weak-collision model. The system of kinetic equations for the density matrix is solved by the expansion in spatial harmonics and eigenfunctions of the collision operator. The profile of nonlinear addition to the probe-wave absorption is determined for various values of the effective ion-ion collision frequencies and various amplitudes and frequencies of standing wave. It is shown that the broadening of the central nonlinear structure in the spectrum is caused by the Coulomb dephasing effect. The computational results are in qualitative agreement with the available experimental data. (C) 2004 MAIK "Nauka / Interperiodica".
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机译：对于放置在强驻光波场中的三能级离子，可以考虑探测场光谱问题。在弱碰撞模型中考虑了离子与等离子体的相互作用以及速度变化的库仑散射。通过碰撞算子的空间谐波和本征函数的扩展来求解密度矩阵的动力学方程组。对于有效离子-离子碰撞频率的各种值以及驻波的各种振幅和频率，确定了探测波吸收的非线性添加轮廓。结果表明，光谱中中心非线性结构的展宽是由库仑移相效应引起的。计算结果与可用的实验数据在质量上一致。 （C）2004 MAIK“ Nauka / Interperiodica”。
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