Free–free experiments: the search for dressed atom effects

Free–free experiments: the search for dressed atom effects
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免费——免费实验:寻找修饰原子效应

DOI:
10.1088/1361-6455/aac31b
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发表时间:
2018
期刊:
Molecular and Optical Physics
影响因子:
--
通讯作者:
deHarak, B A
deHarak, B A
中科院分区:
--
文献类型:
--
作者:
Martin, N L;Weaver, C M;Kim, B N;deHarak, B A

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综述了自由-自由电子散射的实验,特别是自由电子被原子或分子散射时,自由电子对1.17 eV光子的吸收或发射。对于大的散射角,这种实验可以用一个与目标特性无关的简单的解析理论来很好地描述。在小散射角下,这一理论对于具有高偶极子极化率α的目标是错误的,并且需要在散射幅度中加入一个附加项。这一项与偶极极化率成正比,因此在自由-自由截面中引入了目标的性质--即激光光场使原子“装扮”。本文给出了一个自由自由实验的进展报告,该实验旨在寻找在有激光场存在的电子碰撞激发Ar时的这种“修饰原子”效应;Ar的最低激发态具有α≈300个原子单位。
Experiments on free–free electron scattering, specifically the absorption or emission of 1.17 eV photons from a Nd: YAG laser field by an unbound electron when it is scattered by an atom or molecule, are reviewed. For large scattering angles such experiments are well described by a simple analytical theory that is independent of the properties of the target. At small scattering angles this theory breaks down for targets with a high dipole polarizability α, and an additional term needs to be incorporated in the scattering amplitude. This term is proportional to the dipole polarizability, and hence introduces the properties of the target into the free–free cross section—ie, the laser field'dresses' the atom. A progress report is given of free–free experiments designed to look for such'dressed atom'effects during the electron-impact excitation of argon in the presence of a laser field; the lowest excited states of argon have α≈ 300 atomic units.
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