2-( v,k ,1) Designs and PSL (3, q ) where q is Odd by Shifeng D.

By Shifeng D.

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Compared to bending magnet radiation, wiggler radiation is enhanced by the number of magnet poles. 2 X-RAY BEAMLINES AND MONOCHROMATORS An XAS spectrum originates from the fact that the probability of an electron to be ejected from a core level is dependent on the energy of the incoming beam. For this reason, the energy of the x-rays is varied during an experiment. Of course, this requires a monochromatic beam. However, the radiation generated by a synchrotron is polychromatic. Therefore, the desired wavelength has to be filtered from the polychromatic beam.

1999). These spectra can be measured off-resonance after excitation with an x-ray energy well above the Fe K edge. In addition, one can use a high-energy electron or proton to excite the 1s core hole as, for example, used in energy dispersive x-ray emission (EDX) in an electron microscope. Another route to create a 1s core hole is by electron capture in isotopes of some elements. The same spectra can also be measured on-resonance in a RXES experiment. One can excite at the main dipole edge in a 1s4p transition, yielding 1s2p(4p) RXES, and so on.

Since the proton is changed to a neutron, the number of protons decreases by one and the atomic mass remains unchanged. By changing the number of protons, electron capture transforms the nuclide into a new element. Because the core electron neutralizes a proton, no extra valence electron is created. The charge of the nucleus plus core electrons together stays constant, which implies that there will be essentially no effect on the valence electrons. The difference with the excitation of a core electron out of the solid is that the screening processes will be different.

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