Synchrotron radiation

About: Synchrotron radiation is a research topic. Over the lifetime, 14639 publications have been published within this topic receiving 244775 citations. The topic is also known as: magnetobremsstrahlung radiation & Synchrotron Radiation.

Relations between the Photoluminescence Efficiency of CdTe Nanocrystals and Their Surface Properties Revealed by Synchrotron XPS

Abstract: The surface of colloidally prepared CdTe nanocrystals capped with thioglycolic acid has been studied by photoelectron spectroscopy with tunable synchrotron radiation excitation. Colloidally prepare...

The interaction of relativistic particles with strong crystalline fields

Abstract: Crystals present a uniquely simple environment for the investigation of strong electromagnetic fields. When energetic charged particles are incident on crystals close to major crystallographic directions, their electromagnetic interactions depend crucially on the kinematic conditions. The coherence of the crystalline field can produce very strong electric fields in the rest frame of the particle, exceeding the so-called Schwinger field or quantum critical field. In that domain, the radiation emission takes a substantial part of the electron energy and the ``formation zone'' changes character. In this review the theory appropriate to the different kinematics domains is described, concentrating on the effects occurring at extreme fields. Properties discussed include strong field synchrotron radiation, channeling radiation, bremsstrahlung, and photon interactions. Applications are given to radiation sources, bending of particle beams, and sources of polarized GeV photons.

Galactic synchrotron emission with cosmic ray propagation models

Abstract: Cosmic ray (CR) leptons produce radio synchrotron radiation by gyrating in inter-stellar magnetic fields (B-field). Details of B-fields, CR electron distributions andpropagation are still uncertain.We present developments in our modelling of Galactic radio emission with the GAL-PROP code. It now includes calculations of radio polarization, absorption and free-freeemission. Total and polarized synchrotron emission are investigated in the context ofphysical models of CR propagation. Predictions are compared with radio data from 22MHz to 2.3 GHz, and WilkinsonMicrowaveAnisotropyProbedata at 23 GHz. Spatialand spectral effects on the synchrotron modelling with different CR distribution, prop-agation halo size and CR propagation models are presented. We find that all-sky totalintensity and polarization maps are reasonably reproduced by including an anisotropicB-field, with comparable intensity to the regular one defined by rotation measures. Ahalo size of 10 kpc, which is larger than usually assumed, is favoured.This work provides a basis for further studies on foreground emission with the Plancksatellite and on interstellar gamma-ray emission with Fermi-Large Area Telescope.Key words: cosmic rays - ISM: magnetic fields - Galaxy: general - radi continuum:ISM.

An Overview of Synchrotron Radiation Applications to Low Temperature Geochemistry and Environmental Science

Abstract: The availability of synchrotron radiation (SR) to the scientific community has literally revolutionized the way X-ray science is done in many disciplines, including low temperature geochemistry and environmental science. The key reason is that SR provides continuum vacuum ultraviolet (VUV) and X-ray radiation five to ten orders of magnitude brighter than that from standard sealed or rotating anode X-ray tubes (Winick 1987; Altarelli et al. 1998). Although SR was first observed indirectly by John Blewitt in 1945 (Blewitt 1946) and directly by Floyd Haber in 1946 at the General Electric 100-MeV Betatron in Schenectady, NY (see Elder et al. 1947; Baldwin 1975), it took 10 to 15 years before the first systematic applications of SR, which involved spectroscopic studies of the VUV absorption of selected elements (Tomboulian and Hartman 1956) using the 300-MeV synchrotron at Cornell University and of rare gases (Madden and Codling 1963) using the National Bureau of Standards SURF I synchrotron. As of September 2002, there are about 75 storage ring-based SR sources in operation, in construction, funded, or in advanced planning in 23 countries, with 10 fully dedicated SR storage ring facilities in the U.S.. A listing of these sources can be obtained at the following web site: http://www-ssrl.slac.stanford.edu/sr_sources.html . The first SR experiments relevant to low temperature geochemistry and environmental science, although not performed on earth or environmental materials, were X-ray absorption fine structure (XAFS) spectroscopy measurements on amorphous and crystalline germanium oxide conducted on the SPEAR storage ring at the Stanford Synchrotron Radiation Project in 1971 by Dale Sayers, Farrel Lytle, and Edward Stern (Sayers et al. 1971). Prior to the availability of SR in the hard X-ray energy range (> 5 keV), XAFS spectroscopy measurements were impractical because of the high X-ray flux required and the need for a continuously tunable …