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首页> 外文期刊>Journal of Experimental and Theoretical Physics >Probe field spectroscopy in two-level systems with arbitrary phase memory in collisions
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Probe field spectroscopy in two-level systems with arbitrary phase memory in collisions

机译：碰撞时具有任意相位记忆的两级系统中的探针场光谱

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摘要

The spectrum of weak probe field absorption (amplification) by two-level atoms experiencing collisions with buffer gas atoms in a strong resonance laser field is studied theoretically. Analysis is carried out for systems with a weak Doppler broadening under relatively mild constraints on the strong field intensity for the general case of an arbitrary change in the phase of the radiation-induced dipole moment in elastic collisions of gas particles. It is shown that, in spite of uniform broadening of the absorption line, the probe field spectrum exhibits a clearly manifested anisotropy to mutual orientation of the wavevectors of strong and probe radiation. It is found that the width of resonances in the probe field spectrum under definite conditions (that can easily be created in experiments) is proportional to the diffusion coefficient for atoms interacting with radiation. This fact can form the basis of the spectroscopic method for measuring the transport frequencies of collisions between particles absorbing radiation and buffer particles. It is shown that phase memory effects in collisions strongly modify the probe field spectrum both qualitatively and quantitatively. Simple operative formulas proposed for the probe field spectrum are convenient for experimental data processing. (C) 2005 Pleiades Publishing, Inc.
机译：理论上研究了在强共振激光场中与缓冲气体原子发生碰撞的两能级原子对弱探针场的吸收（放大）光谱。对于在气体颗粒的弹性碰撞中辐射诱发的偶极矩的相位发生任意变化的一般情况下，针对强磁场强度在相对温和的约束下具有弱多普勒展宽的系统进行了分析。结果表明，尽管吸收线均匀展宽，但探针场谱在强辐射和探针辐射的波矢量相互取向上仍表现出明显的各向异性。发现在确定条件下（可以在实验中轻松创建）探针场光谱中的共振宽度与与辐射相互作用的原子的扩散系数成正比。该事实可以构成用于测量吸收辐射的粒子与缓冲粒子之间的碰撞的传输频率的光谱方法的基础。结果表明，碰撞中的相记忆效应在质量和数量上都极大地改变了探针场谱。为探测场谱提出的简单运算公式便于进行实验数据处理。 （C）2005年Pleiades Publishing，Inc.

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