Laser-assisted radiative recombination in a cold hydrogen plasma

IF 1.5 4区 物理与天体物理 Q3 OPTICS Journal of Physics B: Atomic, Molecular and Optical Physics Pub Date : 2024-09-09 DOI:10.1088/1361-6455/ad75f6
I I Fabrikant and H B Ambalampitiya
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Abstract

We study the process of laser-assisted radiative recombination of an electron with a proton in a cold hydrogen plasma employing the semiclassical Kramers’ approach which involves calculation of classical trajectories in combined laser and Coulomb fields and the use of the correspondence principle. Due to the Coulomb focusing effect, recombination is the most effective when the initial electron momentum is parallel to the laser polarization. Orders of magnitude enhancement of the cross section, as compared to the laser-free case, is observed in this case. With increasing angle between the electron momentum and polarization, the recombination cross section drops. However, even after averaging over Maxwellian velocity distribution we obtain a substantial enhancement of the recombination rate constant, as compared to the zero-field case. For the field intensities in the range 30–350 MW cm−2, the enhancement occurs in the region of the radiation wavelength from 5 to 20 µm and for the plasma temperature from 20 to 300 K.
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冷氢等离子体中的激光辅助辐射重组
我们采用半经典克拉默方法研究了冷氢等离子体中电子与质子在激光辅助下的辐射重组过程,该方法包括计算激光场和库仑场联合作用下的经典轨迹并使用对应原理。由于库仑聚焦效应,当初始电子动量与激光偏振平行时,重组最为有效。与无激光情况相比,在这种情况下观察到的横截面增强了几个数量级。随着电子动量与偏振之间的角度增大,重组截面下降。然而,与零场情况相比,即使对麦克斯韦速度分布进行平均,我们也能获得重组速率常数的大幅提升。当电场强度在 30-350 MW cm-2 范围内时,增强发生在辐射波长为 5 至 20 µm 的区域,等离子体温度为 20 至 300 K。
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来源期刊
CiteScore
3.60
自引率
6.20%
发文量
182
审稿时长
2.8 months
期刊介绍: Published twice-monthly (24 issues per year), Journal of Physics B: Atomic, Molecular and Optical Physics covers the study of atoms, ions, molecules and clusters, and their structure and interactions with particles, photons or fields. The journal also publishes articles dealing with those aspects of spectroscopy, quantum optics and non-linear optics, laser physics, astrophysics, plasma physics, chemical physics, optical cooling and trapping and other investigations where the objects of study are the elementary atomic, ionic or molecular properties of processes.
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