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Applications of Synchrotron Radiation: High-Resolution by W. Eberhardt (auth.), Professor Dr. Wolfgang Eberhardt

By W. Eberhardt (auth.), Professor Dr. Wolfgang Eberhardt (eds.)

Applications of synchrotron radiation in physics, chemistry, fabrics technological know-how, and biology has now matured from an unique experimental box right into a well-established zone of technological know-how. The spectroscopy of molecules and molecular adsorbates on surfaces is one quarter of technological know-how, the place, long ago, synchrotron-radiation-related reports had made an influence on knowing the ground-state houses in addition to the dynamics. With the recent high-brightness synchrotron-radiation assets forward, this can definitely stay a box of very lively learn. This quasi-monograph experiences the present nation of the sphere for either, the lively examine scientist, and the recent graduate pupil wishing to develop into accustomed to this box of research.

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Additional resources for Applications of Synchrotron Radiation: High-Resolution Studies of Molecules and Molecular Adsorbates on Surfaces

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Three lines are still found, but their assignment is, as we shall see further below, quite different from the one for the condensed molecular solid. 61], given in Fig. 20, indicates that the considerations presented so far are not complete and sufficient to explain all experimental findings. It has been shown theoretically 2. Band-Structure Determination of Adsorbates Leed N2 CO Brillouin zone (2o u ) 40 • ••• • *· 0--.... 0 • Single domain I·) absllnl peaks du. ) b ~ cP 'bcPt'b { ~cP~cf~ ~ s ~cf~cP~ '" Ci E~ Q) ~ i3 < E~ E~ : E~ E~ < E~ Cl c:: '0 c:: o -9 ~ « y z l1txyl 11tu) ilk" 0) X Cl c:: :cc:: 0 ID Y (k "i-I 10~1'~10 o$t~~~1~~~~~ 1-~10~1~~~~~ ~~~~o$t E, ~ EP E; # E~ ~~ i 10~~~~ ~~~~~ i t~t~t 1-~~~~ ~~~~~ Fig.

J. Freund and H. 3 T=20 K ~ '- >- CI L.. 5 Fig. 21. Measured dispersions in the 50' CO levels of COjAg(111) in a herringbone structure. However, there are geometries where one could expect a strong splitting for one a-orbital and a very small splitting for the other a-orbital. 72]. Assume one orbital to be bonding, the other one to be anti bonding with respect to the two nuclei as is the case for the 5a and 4a orbitals, respectively. If we construct two-dimensional wave functions based on both orbitals, then at the Brillouin zone center the splitting of the bands is small or even zero for the 4a (2au ) orbital, and large for the 5a (3a g), orbital.

81J demonstrated that both bands at higher binding energy are due to states of O'-symmetry by investigating the shape resonance discussed above. The 40' ion state as well as the accompanying shake up transition exhibited parallel resonance behaviour as expected according to the assignment in Fig. 20. 82]. In the latter system the adsorption energy is between the one for CO / Ag and CO / Cu which leads us to expect more intense satellites, and corroborates the ideas presented here. j7)CO /Cu(111), for which Fig.

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