强磁场中电磁辐射散射的自激效应

电子在磁场中运动,对频率ω_i的外来电磁波的散射,除频率仍为ω_i的部分以外,还发出与回旋辐射相同频率的散射波,这可以称作是自激效应.除了高频极限,该效应对散射截面有相当大的影响.本文对单个电子及冷等离子体情形,给出了强磁场中非相对论性经典电子散射截面的修正计算.讨论了电子散射的谱分布,给出某些典型情形中平衡状态下磁等离子体的Thomsom吸收系数.本文结果可应用于X射线脉冲星谱线形成等问题. 

Self-excitation Effect of Scattering of Electromagnetic Radiation in a Strong Magnetic Field

In light of the solution of electron motion equation in a magnetic field, the electron scattering in response to the incident electromagnetic wave of frequency wi includes the part whose frequency is the same as the cyclotron one besides that of frequency wi. This effect can be called the self-excitation and, except the highfrequency limit, has a considerable influence upon the cross section. In this paper, the modified cross sections of classical non-relativistic electron in the case of both a single electron and cold plasma are. given. The spectrum distribution of electron scattering is discussed, and the Thomson absorption coefficients of magnetized thermal equilibrium plasma are obtained for some typical cases. It is also pointed out that the result here can be applied for many astrophysical aspects such as the spectrum formation of X-ray pulsars.