Spin polarization photoemission

The following examples focus on valence level ionization by ultraviolet light, since such processes would produce low energy electrons, which are the most effective at inducing reactions in an adsorbed molecule. There are also many examples of spin-polarized photoemission and Auger electron emission from core levels of both magnetic and nonmagnetic materials [29-35]. 

Johnson PD (1997) Spin-polarized photoemission. Rep Prog Phys 1217... 

Osterwalder J (2006) Spin-polarized photoemission. In Beaurepaire E, Bulou H, Scheurer F, Kappler JP (eds) Magnetism a synchrotron radiation approach. Springer, Berlin, pp 95-120... 

Matthew JAD, Seddon EA, Xu YBO (1998) Spin polarized photoemission from amorphous alloy surfaces. J Electron Spectrosc Relat Phenomena 88-91 171-177... 

Meier F, Pescia D (1981) Band-structure investigation of gold by spin-polarized photoemission. Phys Rev Lett 47 374... 

Meier, F. (1985) Polarized electrons in surface physics. In Spin Polarized Photoemission by Optical Spin Orientation in Semiconductors (ed. R. Feder). World Scientific, Singapore. Mendelsohn, L. B., Biggs, F. and Mann, J. B. (1970) Phys. Rev. A2, 1130. 

Fig. 11. Spin-polarized photoemission spectra at different temperatures at normal emission (center of the surface Brillouin zone). The majority and minority components are shown with solid (up) and open (down) triangles, respectively. The majority and minority bulk bands are marked with up and down arrows. (From Dongqi Li et al. 1995.)...

Heineman and Temmerman 1994) indicated that the surface of Gd(OOOl) is antiferro-magnetically coupled with the bulk magnetic moment. This calculated antiferromagnetic alignment of the surface and bulk appeared to support early spin-polarized photoemission experiments (Weller et al. 1985a),... 

Fig. 14. The in-plane spin-polarized photoemission spectra for Gd(OOOl) films on W(110) at 100 K across the Gd 4f level, taken from Dongqi Li et al. (1993a). (a) the spectra of a freshly deposited film and (b) following exposure to a small amount of contamination. Spin-majority (up triangles) and spin-minority (down triangles) are indicated. The inset shows the different 4f photoemission spectra for one monolayer and ten monolayers of gadolinium (and the difference spectrum) on Cu(100) (LaGraffe et al. 1989b), illuminating the different surface...

Methods to test surface magnetism (Siegmann et al. Kirschner, 1985) spin polarized photoemission... 

Direct observation of spin polarization 7.3.1. Spin polarized photoemission... 

Also from the spectral dependence of the spin polarized photoemission one can draw important conclusions. The photoelectrons emitted with the lowest photon energy will be from always present impurities. A sharp increase of P is... 

Thus spin polarized photoemission has been shown to be a new tool in giving information on the surface magnetization. Besides, efficient sources of spin polarized electrons can be made from e.g. EuO containing a few percent La and degrees of polarization of 80% at 30 kOe have been verified experimentally. 

M. Stampanoni, A. Vaterlaus, M. Aeschlimann, F. Meier, Magnetism of epitaxial bee iron on Ag(OOl) observed by spin-polarized photoemission. Phys. Rev. Lett. 59(21), 2483-2485... 

In a spin-polarized photoemission experiment, the measured quantities are thus the spin-integrated spectrum /(eyn, t) = P f(ei3n, t) + f ( kin.fc) 3nd the spin polarization Pi(c]dn, k), from which the spin-dependent spectra can be recovered as... 

As an example of the renewed interest in spin-polarized photoemission in surface science, we discuss here the recent observation of a spin sphtting in reciprocal space of the Shockley surface state on Au(lll). 

Figure 3.2.2.33 Spin-polarized photoemission measurements of the Shockley surface state on Au(lll) at several emission angles. (a) The top curves of each data set show the intensity measured by four channels of one of the Mott polarimeters. The lower curves give the measured polarization values determined for the in-piane and...

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