电磁波作用下电子相对论沟道的强场近似
Strong field approximation to the relativistic channeling of electrons in the presence of electromagnetic waves
摘要：
本文研究了相对论平面沟道电子与强电磁场的相互作用。使用强场近似中的S-矩阵方法，它表明，晶体的周期性影响剧烈的激发过程，抑制多光子吸收的可能性，除了某些特殊情况下。这种选择性激发打开了通过外部场控制沟道过程的动力学的可能性。从相对论量子力学Dirac方程出发，得到了S矩阵N光子激发率的显式表达式和相应的守恒律。
英文摘要：
We present a study of the interaction of a relativistically planar channeled electron with an intense electromagnetic field. Using a S-Matrix approach in the Strong Field Approximation, it is shown that the crystal periodicity affects drastically the excitation process, suppressing the possibility of multiphoton absorption except for some particular cases. This selective excitation opens the possibility to control the dynamics of the channeling process by means of an external field. Explicit expressions for the S-matrix N-photon excitation rates together with the corresponding conservation laws are obtained from the relativistic quantum mechanical Dirac equation.
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