Helium atom scattering from oxide surfaces

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
F Traeger

Abstract

Many experimental methods of surface science employ electrons or photons of considerable incident energy as probe particles. However, insulating surfaces or delicate physisorbed layers may be damaged by these particles and should, therefore, be analyzed with a gentler probe: He atom scattering allows to determine the symmetry of the unit cell and the detection of phase transitions from diffraction measurements as well as the determination of surface and adsorbate vibrations by time-of-flight resolved detection. Herein, the application of He atom scattering to oxide surfaces is demonstrated on the basis of the examples of MgO and ZnO. MgO(001) is a very inert and stable surface, whereas hydrogen atoms are chemisorbed on the mixed-terminated ZnO(1010) and on both polar faces: ZnO(0001) and ZnO(0001). He atom scattering is very sensitive to the presence of hydrogen on surfaces. In addition ZnO reacts with molecules such as water, CO and CO(2). It is demonstrated that in combination with photoelectron spectroscopy and thermal desorption spectroscopy He atom scattering can also contribute to studies of surface chemistry.

References

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Citations

Apr 9, 2011·The Journal of Physical Chemistry. a·Britta Johnson, Robert J Hinde
Jul 13, 2011·Physical Chemistry Chemical Physics : PCCP·R Martinez-CasadoN M Harrison
Aug 7, 2008·The Journal of Chemical Physics·Miriam A FreedmanS J Sibener
Jan 19, 2011·The Journal of Chemical Physics·Jeremy M MoixWilliam Allison
Jul 15, 2009·Journal of Colloid and Interface Science·Y K GaoC Wöll
Jun 21, 2007·Angewandte Chemie·Yuemin WangChristof Wöll
Aug 3, 2012·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Gargi DuttaPaul Sherwood
Mar 15, 2011·Journal of Physics. Condensed Matter : an Institute of Physics Journal·R Martínez-CasadoCh Wöll
Apr 21, 2011·The Journal of Physical Chemistry. a·N AvidorG Alexandrowicz
Apr 21, 2011·The Journal of Physical Chemistry. a·J KissCh Wöll

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