By Ralph Feder
This publication covers a bit of the sector of polarized electron physics, which has skilled a very quick development over the last decade. It offers with spin-polarized electron spectroscopies utilized to sturdy surfaces, with specific emphasis at the info that may be acquired via staring at the spin of scattered or emitted electrons. either magnetic and non-magnetic solids are investigated. reckoning on the kind of test and the diversity of electron energies concerned as a rule floor homes or more often than not bulk homes are probed, notwithstanding a pointy contrast can't constantly be made.The publication addresses itself to researchers within the box, to graduate physics scholars, and to all those that want to recognize extra approximately this new department of floor physics. The emphasis 1s on simple recommendations for the outline of polarized electrons at surfaces and on contemporary experimental effects and their interpretation.
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Additional resources for Polarized Electrons at Surfaces
The inner potential causes a reduction of the wavelength of the electrons inside the c r y s t a l . For normal i n cidence and normal r e f l e c t i o n (~II = ~ = q~ ~ O) a change of Vor only changes 9L, which v a n s that the t h e o r e t i c a l I-V curve of the (0,0) beam remains the same ex- cept for a s h i f t on the energy scale. This is approximately true also for other low index beams. By f i t t i n g i n t e n s i t y maxima of calculated and measured curves on the energy axis Vor may be determined as a function of energy.
11 do not play any role. In other words, the final state I@f> in photoemission is ident i c a l to the 'time-reversed LEED state' (cf. 50)). I t is obtained from Fig. 9 by replacing the source by a detector and by inverting a l l pointers indicating the group v e l o c i t y . This fundamental relation between LEED and photoemission also has consequences for spin polarization effects in photoemission (see Sect. 2). As we know, the Bloch components of the LEED state are damped by i n e l a s t i c processes.
Rather, there is a continuous t r a n s i t i o n from the two-dimensional charge d i s t r i b u t i o n that generates the Coulomb f i e l d , to the spherical d i s t r i b u t i o n of the 'exchange-correlat i o n hole' inside the s o l i d . The exchange-correlation energy Nxc is gained by the electron in addition to the energy e@D i t gains from passing through the surface dipole layer, which is generated by the s p i l l - o v e r of the electron charge density. Within the j e l l i u m model we have approximately for the real part of the inner potential Vor = ~xc + eCD = EF + e@ .