Results 31 to 40 of about 52,966 (265)
Soft X-rays and Secondary Electrons [PDF]
Physical Review, 1924 Velocity distribution of photo-electrons excited by soft x-rays.— The apparatus was similar to that used in the magnetic analysis of β rays. Soft x-rays excited by primary electrons with 150 to 1500 volts energy, fall on a radiator of W, Pt, Al, etc. The photo-electrons emitted in a plane approximately normal to the uniform magnetic field acting, each ...
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Broadband soft x-ray polarimetry [PDF]
SPIE Proceedings, 2010 We developed an instrument design capable of measuring linear X-ray polarization over a broad-band using conventional spectroscopic optics. A set of multilayer-coated flats reflects the dispersed X-rays to the instrument detectors. The intensity variation with position angle is measured to determine three Stokes parameters: I, Q, and U -- all as a ...
Schulz, Norbert S. +3 more
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Mask-based dual-axes tomoholography using soft x-rays
New Journal of Physics, 2015 We explore tomographic mask-based Fourier transform x-ray holography with respect to the use of a thin slit as a reference wave source. This imaging technique exclusively uses the interference between the waves scattered by the object and the slit ...
Erik Guehrs +7 more
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Coherent sub-femtosecond soft x-ray free-electron laser pulses with nonlinear compression
APL Photonics, 2023 We demonstrate the generation of coherent soft x-ray free-electron laser (FEL) pulses with a duration below 1 fs using nonlinear compression with a low-charge electron beam (10 pC). The approach is simple, and it does not require any special hardware, so
Eduard Prat +6 more
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The Soft X-ray Excess in Quasars and Deep X-ray Surveys [PDF]
Symposium - International Astronomical Union, 1994 We examine the surface density of quasars expected in the ROSAT PSPC surveys, using quasar optical luminosity functions and model continuum spectra including a soft X-ray excess. We show that the surface density is a sensitive function of the characteristic energy of the soft excess, and the absorption within the quasar as well as the interstellar ...
Ajit Kembhavi, A. C. Fabian
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Centaurus A: Exploring the Nature of the Hard X-Ray/Soft Gamma-Ray Emission with INTEGRAL
The Astrophysical Journal, 2023 The question of the origin of the hard X-ray/soft gamma-ray emission in Centaurus A (Cen A) persists despite decades of observations. Results from X-ray instruments suggest a jet origin since the implied electron temperature ( kT _e ) would cause runaway
James Rodi +3 more
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Physics Today, 2001 Synchrotron radiation with photon energies at or below 1 keV is giving new insights into such areas as wet cell biology, condensed matter physics and extreme ultraviolet optics technology.
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Resonant elastic soft x-ray scattering [PDF]
Reports on Progress in Physics, 2013 Resonant (elastic) soft x-ray scattering (RSXS) offers a unique element, site, and valence specific probe to study spatial modulations of charge, spin, and orbital degrees of freedom in solids on the nanoscopic length scale. It cannot only be used to investigate single crystalline materials.
Fink, J. +3 more
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FEBS Letters, EarlyView.Inositol pyrophosphates are energy‐rich signaling molecules that perform critical functions in cells. Three different families of phosphatases hydrolyze the β phosphate of the inositol pyrophosphate molecules: two have narrow specificities and one is promiscuous.
Ronda J. Rolfes
wiley +1 more source
PSF correction in soft X-ray tomography [PDF]
Journal of Structural Biology, 2018 Abstract In this manuscript, we introduce a linear approximation of the forward model of soft x-ray tomography (SXT), such that the reconstruction is solvable by standard iterative schemes. This linear model takes into account the three-dimensional point spread function (PSF) of the optical system, which consequently enhances the ...
Axel Ekman +5 more
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