X-Ray Synchrotron Radiation

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Jacco Vink - One of the best experts on this subject based on the ideXlab platform.

  • Supernova remnants: the X-Ray perspective
    The Astronomy and Astrophysics Review, 2011
    Co-Authors: Jacco Vink
    Abstract:

    Supernova remnants are beautiful astronomical objects that are also of high scientific interest, because they provide insights into supernova explosion mechanisms, and because they are the likely sources of Galactic cosmic rays. X-Ray observations are an important means to study these objects. And in particular the advances made in X-Ray imaging spectroscopy over the last two decades has greatly increased our knowledge about supernova remnants. It has made it possible to map the products of fresh nucleosynthesis, and resulted in the identification of regions near shock fronts that emit X-Ray Synchrotron Radiation. Since X-Ray Synchrotron Radiation requires 10–100 TeV electrons, which lose their energies rapidly, the study of X-Ray Synchrotron Radiation has revealed those regions where active and rapid particle acceleration is taking place.

  • Non-thermal X-Ray Emission from Supernova Remnants
    AIP Conference Proceedings, 2005
    Co-Authors: Jacco Vink
    Abstract:

    Recent studies of narrow, X‐ray Synchrotron radiating filaments surrounding young supernova remnants indicate that magnetic fields strengths are relatively high, B ∼ 0.1 mG, or even higher, and that diffusion is close to the Bohm limit. I illustrate this using Cas A as an example. Also older remnants such as RCW 86 appear to emit X‐ray Synchrotron Radiation, but the emission is more diffuse, and not always confined to a region close to the shock front. I argue that for RCW 86 the magnetic field is likely to be low (B ≈ 17 μG), and at the location where the shell emits X‐ray Synchrotron Radiation the shock velocity is much higher than the average shock velocity of ∼ 600 km s−1.

Raimund Feifel - One of the best experts on this subject based on the ideXlab platform.

Olle Björneholm - One of the best experts on this subject based on the ideXlab platform.

E. I. Zinin - One of the best experts on this subject based on the ideXlab platform.

  • Fast intrinsic luminescence of RbI and KI crystals excited by X-Ray Synchrotron Radiation
    Nuclear Instruments and Methods in Physics Research Section A: Accelerators Spectrometers Detectors and Associated Equipment, 1995
    Co-Authors: A.n. Belsky, V. V. Mikhailin, E. I. Zinin, S.m. Klimov, A.v. Gektin
    Abstract:

    Abstract Luminescence spectra and decay kinetics of the fast intrinsic luminescence of RbI and KI crystals at temperatures of 80 and 300 K have been measured with pulsed X-Ray Synchrotron Radiation (SR) excitation. At 80 K the emission spectra show the well-known fast emission bands centered at 3.84 eV in RbI and at 4.15 eV in KI. At room temperature subnanosecond (∼ 100 ps) emission bands with non-exponential decay kinetics are observed at 3.7 eV in RbI and at 4.0 eV in KI. These two bands may be associated with high temperature fast intrinsic luminescence of CsI.

  • Time-resolved spectroscopy of scintillation materials using X-Ray Synchrotron Radiation
    MRS Proceedings, 1994
    Co-Authors: A.n. Belsky, Vitaly V. Mikhaihin, Andrey L. Rogalev, E. I. Zinin
    Abstract:

    The time-resolved luminescence spectra and decay kinetics of BaF{sub 2}, BGO, and CeF{sub 3}, were measured with the dissector technique using X-Ray Synchrotron Radiation (SR) of different spectral composition from wiggler mounted at VEPP-3 storage ring (Novosibirsk). Two effects of X-Ray excitation energy on the luminescence parameters were observed: modifications of the emission spectrum and acceleration of decay kinetics. Under the excitation by soil X-Ray SR the 220 nm emission band for BaF{sub 2} is broadened, whereas shorter wavelength part of CeF{sub 3} and BGO emission spectra increases. For luminescence decay of excitons and chemiluminescence the degree of the deviation from the single exponential law depends on the photon energies and increases under soft X-Ray excitation as well. These effects are supposed to be due to the interaction of electronic excitations created after the relaxation of deep core holes. Fast intrinsic luminescence was observed for CdI{sub 2} and CsPbCl{sub 3} under X-Ray SR excitation. 500 nm band of CdI{sub 2} has characteristic time {tau} = 4.6 ns, whereas 420 nm band of CsPbCl{sub 3} shows very fast decay with {tau} = 0.2 ns.

  • Time-resolved luminescence of CeF3 crystals excited by X-Ray Synchrotron Radiation
    Chemical Physics Letters, 1993
    Co-Authors: Christian Pedrini, Bernard Moine, D. Bouttet, A.n. Belsky, V. V. Mikhailin, Andrey N. Vasil’ev, E. I. Zinin
    Abstract:

    Abstract Under X-Ray Synchrotron Radiation (SR) of storage ring VEPP-3 excitation time-resolved luminescence spectra and decay curves for two different CeF 3 crystals have been measured. The temperature dependence of the decay kinetics of emission at 300 nm of new pure CeF 3 crystal has been studied. The maximum of the intensity of this emission was observed at 390 K under SR X-Ray excitation. The results are compared with data obtained under UV SR excitation and are discussed in terms of two models of luminescence quenching.

John H. D. Eland - One of the best experts on this subject based on the ideXlab platform.

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