| 1. |
- Johansson, H. I P, et al.
(författare)
-
Core-level shifts on Be(101̄0)
- 1994
-
Ingår i: Physical Review B (Condensed Matter). - 0163-1829. ; 49:24, s. 17460-17463
-
Tidskriftsartikel (refereegranskat)abstract
- A high-resolution photoemission study of the Be (101̄0) surface, at a sample temperature of 100 K, is reported. Three surface-shifted Be 1s components are revealed having shifts of -700, -500, and -220 meV. These are interpreted as originating from the first, second, and third plus fourth atomic layers while the bulk signal originates from the fifth and deeper layers. The surface layer shift for this more open Be(101̄0) surface is found to be smaller than for the close-packed Be(0001) surface. Reasons for this unusual behavior are suggested.
|
|
| 2. |
- Johansson, L. I., et al.
(författare)
-
Surface core level shift on Be( 112̄0)
- 1994
-
Ingår i: Surface Science. - : Elsevier BV. - 0039-6028. ; 321:3
-
Tidskriftsartikel (refereegranskat)abstract
- A photoemission study of the Be(112̄0) surface carried out at a sample temperature of 100 K is reported. A surface shifted Be 1s component, having a shift of - 410 meV, is resolved on this surface. The extracted surface to bulk intensity ratio indicate that this component originates from atoms in the surface layer only. This is opposite to previous observations on both the close-packed Be(0001) surface and the Be(101̄0) surface where sub-surface shifted Be 1s levels were unambiguously identified. Among these three surfaces a surface layer atom is expected to have the lowest coordination on the (112̄0) surface but the surface layer shift is found to be smallest on this surface. Compared to findings on other metals this is unusual and reasons contributing to this behaviour are suggested and discussed.
|
|
| 3. |
- Johansson, L. I., et al.
(författare)
-
Three surface-shifted core levels on Be(0001)
- 1993
-
Ingår i: Physical Review Letters. - 0031-9007. ; 71:15, s. 2453-2456
-
Tidskriftsartikel (refereegranskat)abstract
- The results of a high resolution photoemission study of the Be(0001) surface carried out at temperatures between 100 and 450 K are reported. At 100 K, three distinctly shifted Be 1s levels, exhibiting shifts of -825, -570, and -265 meV, are revealed and interpreted to originate from the three outermost atomic layers. Identification of two subsurface core level shifts and a first layer surface shift of -825 meV is unique among close-packed metal surfaces. Temperature dependent broadening effects observed in the bulk and surface BE 1s peaks are also reported.
|
|
