共查询到19条相似文献,搜索用时 125 毫秒
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本文就大学物理相对论中在不同参考系中测量事件的问题进行了讨论,希望在教学中进一步加强对相对论的理解. 相似文献
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利用相对论质能关系、不同参考系中电磁场的变换关系和牛顿第二定律,先研究了一般的电源电动势在不同参考系之间的变换,再推导出相对论中的感生电动势和动生电动势公式,从而使它们达到了定量的统一. 相似文献
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基于细致组态(DCA)方法和跃迁系列群 (UTA) 模型,采用全相对论处理并结合量子亏损理论,计算了金Au激光等离子体的M带5f-3d跃迁的透射谱, 给出了金等离子体在不同电子温度和电子密度的时空电离态特性,平均电离度,离子丰度和离子内各能级的布居数,并模拟出Au等离子体的M 带5f-3d跃迁的细致谱线,其计算结果可对激光等离子体透射谱的电子温度和电子密度进行精密诊断. 相似文献
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我们已介绍过狭义相对论;在那里爱因斯坦把牛顿的相对性原理推广到包括电磁现象,但还是指惯性系说的;各个参考系是相对做匀速运动的惯性参考系.对加速参考系又该如何呢?爱因斯坦在马赫思想的影响下提出:物理规律对所有参考系,不管是惯性系还是加速系,都应该是一样的.这个进一步推广了的相对性原理叫“广义相对性原理”.它是爱因斯坦广义相对论的一个基本原理. 相似文献
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超强激光场中氢原子辐射高次谐波蒙特卡罗模拟 总被引:1,自引:1,他引:0
运用蒙特卡罗方法,模拟和计算出在超强激光场中,氢原子在相对论领域的电离几率和辐射出的高次谐波,并且讨论了氢原子的电离几率和辐射出的高次谐波与激光场的电场和磁场的关系。 相似文献
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Bakunov M.I. Maslov A.V. 《IEEE transactions on plasma science. IEEE Nuclear and Plasma Sciences Society》1999,27(3):655-663
Frequency upshifting of electromagnetic radiation impinging on a relativistically moving ionization front is theoretically investigated. Unlike previous works in this field treating the case of normal incidence and qualitatively similar case of oblique incidence of a transverse electric polarized wave, oblique incidence of a transverse magnetic polarized wave on the front is considered. The peculiarities of the case under consideration are connected with the generation of Langmuir waves behind the front and Brewster's phenomenon. We present a complete analysis of the incident wave transformation including analysis of the frequencies and amplitudes of the waves excited ahead of and behind the front. Special emphasis is made on energy transformation in the case when a wave packet is incident on the front. In particular, we show that even for negligible angles of incidence, energy losses via transformation into Langmuir waves may be very high (up to ~60%). In general, generation of Langmuir waves may play a significant role in the plasma-based radiation sources with relativistic ionization fronts 相似文献
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基于当前等离子体物理,本文初步讨论了低环径比托卡马克堆中等离子体的特征。在自洽的低环径比堆芯参数下,计算了α粒子约束和损失,以及不同环径比对它们的影响。 相似文献
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Oliveira e Silva L. Mendonca J.T. 《IEEE transactions on plasma science. IEEE Nuclear and Plasma Sciences Society》1996,24(2):316-322
The interaction of an electromagnetic wave packet with a superluminous ionization front is described here using the Hamiltonian theory of photon acceleration. We also describe the interaction with accelerated ionization fronts. The different qualitative photon trajectories are presented for both cases. The frequency up-shift is also derived. It is shown that a proper tailoring of the ionization front velocity can lead to higher frequency up-shifts than in constant velocity ionization fronts 相似文献
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I. V. Bychkov D. A. Kuz’min V. V. Shadrin V. G. Shavrov 《Bulletin of the Russian Academy of Sciences: Physics》2012,76(3):368-370
The spectrum of coupled spin and electromagnetic waves is obtained for a magnetic with a ferromagnetic spiral structure determined
by nonuniform exchange and relativistic interactions. It is shown that resonant interaction between spin and electromagnetic
waves is possible. The electromagnetic wave reflectance from the plate of a magnetic with a ferromagnetic spiral is calculated
for different spiral angles. 相似文献
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Lai C.H. Katsouleas T.C. Mori W.B. Whittum D. 《IEEE transactions on plasma science. IEEE Nuclear and Plasma Sciences Society》1993,21(1):45-52
The interaction of a light wave with a relativistic ionization front in the presence of an applied DC magnetic field which is perpendicular or parallel to the incident wave is considered. In both cases, four transmitted modes are generated in the magnetized plasma by an incident linearly polarized wave. The frequency upshifts of the various modes are calculated and compared to the unmagnetized case. The corresponding reflection and transmission coefficients are also obtained. Finally, the density ripple associated with the free streaming mode in a magnetized plasma for the perpendicular case is discussed 相似文献
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N. E. Andreev M. V. Chegotov A. A. Pogosova 《Journal of Experimental and Theoretical Physics》2003,96(5):885-896
The propagation of a short intense laser pulse is studied in a gas taking into account the ionization of gas atoms by the high-frequency electromagnetic field of the pulse. The conditions are found under which the ionization structures produced by the laser pulse cause the pulse focusing accompanied by a substantial increase in its intensity. It is shown that the leading edge of the pulse is subjected to ionization refraction at the ionization front, the temporal profile of the pulse becoming steeper. This results in the efficient generation of a wake wave at the ionization front, which is amplified during the development of self-modulation instability. The amplitude of the wake plasma wave achieves a substantial value already at small paths of the pulse in matter (smaller than the diffraction length of the pulse). 相似文献
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The ponderomotive force plays a fundamental role in the absorption of laser light on self-consistent plasma density profiles, in multiple-photon ionization, and in intense field electrodynamics. The relativistic corrections to the ponderomotive force of a transversely polarized electromagnetic wave lead to an approximately 20-percent reduction in the single particle ponderomotive force produced by a 10-?m 1016-W/cm2 laser field. Recent experimental investigations are based on using two intense laser fields to produce desired laser-matter interactions. This paper presents the first derivation of the nonlinear relativistic ponderomotive force produced by two intense laser fields. The results demonstrate that relativistic ponderomotive forces are not additive. 相似文献
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A relativistic generalization of the semiclassical theory of tunneling and multiphoton ionization of atoms and ions in the field of a high-intensity electromagnetic wave with linear, circular, and elliptic polarization is constructed. The exponential factor in the ionization probability is calculated for arbitrary values of adiabaticity parameter γ. In the case of low-frequency laser radiation, an asymptotically exact formula is derived for the ionization rate of the s atomic level, including the Coulomb, spin, and adiabatic corrections and the preexponential factor. 相似文献