Surface Core Level Shifts for the Clean-Surface and Hydrogen-Induced Phase Transitions on W(l00): Fid-Bau Portal

Fachinformationsdienst BAUdigital

A platform for research: civil engineering, architecture and urbanism

Surface Core Level Shifts for the Clean-Surface and Hydrogen-Induced Phase Transitions on W(l00)

Jupille, J. / Purcell, K. G. / Derby, G. / Wendelken, J. / King, D. A.

Abstract The well-known phase transition on W (100)occurs over a narrow temperature range on ‘flat’ single crystals, cut to within 0.1o. Surface core level shift spectra (W 4f 7/2) are reported here for the clean surface phase transition and also for the hydrogen-induced phase transition on such a flat W{100}crystal. Changes through the clean surface phase transition reveal only a subtle difference in the spectra, attributable to a shift in the core level peak associated with the surface layer of only 15 meV. However, hydrogen adsorption at room temperature produces a dramatic change in the spectra. The centre-of gravity of the W 4f 7/2 band shifts by 160 meV as the c(2×2) phase is formed, with a return towards the clean surface value as the 2-monolayer (1×1) phase is formed. The clean surface data are readily interpreted with the Debe-King model for the low temperature structure, but there are interesting differences between stepped and flat surfaces. Analysis of the data from the hydrogen-covered surface proved to be less straight forward.

Access

Check availability in my library

Order at Subito €

Page navigation

Document information

Export, share and cite

Surface Core Level Shifts for the Clean-Surface and Hydrogen-Induced Phase Transitions on W(l00)

Jupille, J. / Purcell, K. G. / Derby, G. / Wendelken, J. / King, D. A.

Abstract The well-known phase transition on W (100)occurs over a narrow temperature range on ‘flat’ single crystals, cut to within 0.1o. Surface core level shift spectra (W 4f 7/2) are reported here for the clean surface phase transition and also for the hydrogen-induced phase transition on such a flat W{100}crystal. Changes through the clean surface phase transition reveal only a subtle difference in the spectra, attributable to a shift in the core level peak associated with the surface layer of only 15 meV. However, hydrogen adsorption at room temperature produces a dramatic change in the spectra. The centre-of gravity of the W 4f 7/2 band shifts by 160 meV as the c(2×2) phase is formed, with a return towards the clean surface value as the 2-monolayer (1×1) phase is formed. The clean surface data are readily interpreted with the Debe-King model for the low temperature structure, but there are interesting differences between stepped and flat surfaces. Analysis of the data from the hydrogen-covered surface proved to be less straight forward.

Surface Core Level Shifts for the Clean-Surface and Hydrogen-Induced Phase Transitions on W(l00)

Jupille, J. / Purcell, K. G. / Derby, G. / Wendelken, J. / King, D. A.

Abstract The well-known phase transition on W (100)occurs over a narrow temperature range on ‘flat’ single crystals, cut to within 0.1o. Surface core level shift spectra (W 4f 7/2) are reported here for the clean surface phase transition and also for the hydrogen-induced phase transition on such a flat W{100}crystal. Changes through the clean surface phase transition reveal only a subtle difference in the spectra, attributable to a shift in the core level peak associated with the surface layer of only 15 meV. However, hydrogen adsorption at room temperature produces a dramatic change in the spectra. The centre-of gravity of the W 4f 7/2 band shifts by 160 meV as the c(2×2) phase is formed, with a return towards the clean surface value as the 2-monolayer (1×1) phase is formed. The clean surface data are readily interpreted with the Debe-King model for the low temperature structure, but there are interesting differences between stepped and flat surfaces. Analysis of the data from the hydrogen-covered surface proved to be less straight forward.

Access

Check availability in my library

Order at Subito €

Page navigation

Document information

Export, share and cite

Document information

Title:

Surface Core Level Shifts for the Clean-Surface and Hydrogen-Induced Phase Transitions on W(l00)

Contributors:

Jupille, J. (author) / Purcell, K. G. (author) / Derby, G. (author) / Wendelken, J. (author) / King, D. A. (author)

Published in:

The Structure of Surfaces II ; 463-469

Springer Series in Surface Sciences ; 11

Publication date:

1988-01-01

Size:

7 pages

ISBN:

978-3-642-73345-1 , 978-3-642-73343-7

ISSN:

DOI:

https://doi.org/10.1007/978-3-642-73343-7_76

Type of media:

Article/Chapter (Book)

Type of material:

Electronic Resource

Language:

English

Keywords:

Core Level , Clean Surface , Total Energy Difference , Hydrogen Coverage , Dime Pair Physics , Surface and Interface Science, Thin Films , Surfaces and Interfaces, Thin Films , Crystallography

Similar titles

Surface XPS core-level shifts of FeS2

Mattila, S. / Leiro, J. A. / Laajalehto, K. | British Library Online Contents | 2003

Se-induced 3d core-level shifts of GaAs(110)

Kaeckell, P. / Schmidt, W. G. / Bechstedt, F. | British Library Online Contents | 1996

Structure and surface core level shifts of the GaAs(114)A and B surfaces

Platen, J. / Setzer, C. / Ranke, W. et al. | British Library Online Contents | 1998

Surface Diffusion Near Phase Transitions

Nieto, F. / Tarasenko, A. / Uebing, C. | Springer Verlag | 2001

Surface phase diagram and temperature induced phase transitions of Sn/Cu(100)

Martinez-Blanco, J. / Joco, V. / Segovia, P. et al. | British Library Online Contents | 2006