Ultrashort pulses of intense, coherent, and tunable far-infrared and mid-infrared radiation, achievable with freeelectron lasers and optical parametric amplifiers, provide unique opportunities to investigate low energy dynamics in solids. This paper reviews our recent experiments on bulk and quantum-confined semiconductors using such radiation. These experiments include: far-infrared spectrosco...

The introduction of a plasma and a strong guide magnetic field in a free electron laser (FEL) slows down the phase velocity of radiation, significantly reducing the requirements on beam energy for generating frequencies below the electron-cyclotron frequency (oi, < oj,). Around plasma resonance (cu, ~ wp), the FEL mode couples to two-stream instability (TSI), attaining a large growth rate, comp...

: We report on the theoretical studies of a recently discovered strong radiation-induced magnetoresistance spike obtained in ultraclean two-dimensional electron systems at low temperatures. The most striking feature of this spike is that it shows up on the second harmonic of the cyclotron resonance. We apply the radiation-driven electron orbits model in the ultraclean scenario. Accordingly, we ...

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Department of Radiation Oncology, New York University School of Medicine, 566 First Avenue, New York, NY 10016, USA Helen Diller Family Comprehensive Cancer Center, University of California San Francisco, 1450 Third Street, San Francisco, CA 94158, USA Life Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, MS977, Berkeley CA 94720, USA Department of Pathology, New York...

Radiation hardness assurance for applications in harsh environments ranging from space missions to fusion reactor diagnostics need to be based on extended radiation experiments. SCK·CEN, the Belgian Nuclear Research Center, is operating different gamma irradiation facilities, with gamma dose rates ranging from 0.1 Gy/h up to 50 kGy/h and with environmental control and on-line instrumentation ca...

We reconsider the apparent conflict of conservation laws in cyclotron radiation discovered by Lieu et al (1983). We show that they did not correctly include the effects of radiation reaction in their calculation. When a ‘recoil’ term, calculated using relativistic quantum theory, is included in the angular momentum of the particle the conflict disappears. We find that the guiding centre of the ...

The equations which determine the response of a charged particle moving in a magnetic field to an incident gravitational wave(GW) are derived in the linearized approximation to general relativity. We briefly discuss several astrophysical applications of the derived formulae taking into account the resonance between the wave and the particle’s motion which occurs at ωg = 2Ω, whenever the GW is p...

High magnetic fields in neutron stars, B ∼ 1011 − 1013 G, substantially modify the properties of atoms and their interaction with radiation. In particular, the photoionization cross section becomes anisotropic and polarization dependent, being strongly reduced when the radiation is polarized perpendicular to the field. In a number of previous works based on the adiabatic approximation the concl...