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Observation of structure changes for Li/Cu(111) by photoemission from Li core and quantum-well states

Anna Carlsson (Institutionen för teknisk fysik) ; Dan Claesson (Institutionen för teknisk fysik) ; Galina Katrich (Institutionen för teknisk fysik) ; Stig-Åke Lindgren (Institutionen för teknisk fysik) ; Lars Wallden (Institutionen för teknisk fysik)
Physical Review B (1098-0121). Vol. 57 (1998), 20, p. 13192 - 13198.
[Artikel, refereegranskad vetenskaplig]

Via photoemission from discrete quantum-well valence states and the Li 1s core level, three different types of atom rearrangements are observed for Cu(111)/Li. In the monolayer coverage range gradual energy shifts for the core-level as well as a quantum-well state reflect a gradual lateral compression of the Li overlayer as more atoms are adsorbed. The onset of Li substitution and formation of a (2×2) structure when, at RT, monolayer Li coverage is exceeded, is monitored via the disappearance and appearance of quantum-well states characteristic of the adsorbed full monolayer of Li and the part substitutional (2×2) structure, respectively. A splitting of the Li 1s emission peak into a doublet reflects the two different Li sites characteristic of the (2×2) phase. A small energy shift of the quantum-well state (25 meV) indicates that, if it is cooled (170 K), the substitutional structure is unstable with respect to Li adsorption.

Denna post skapades 2009-04-24. Senast ändrad 2012-02-14.
CPL Pubid: 92997


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Institutionen för teknisk fysik (1900-2015)


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Chalmers infrastruktur